Sonoma County Conditions

By Location | County

Drought Conditions for Sonoma County

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Get notified when conditions change

people in Sonoma County are affected by drought

No change

since last week

No change

since last month

of people in Sonoma County are affected by drought

No change

since last week

No change

since last month

41st

driest October on record, over the past 129 years

1.35

inches from normal

22nd

wettest year to date over the past 129 years (January-October 2023)

10.4

inches from normal

Learn more about these stats

Current Conditions for Sonoma County

U.S. Drought Monitor 30-Day Precipitation 30-Day Temperature

The U.S. Drought Monitor depicts the location and intensity of drought across the country using 5 classifications: Abnormally Dry (D0), showing areas that may be going into or are coming out of drought, and four levels of drought (D1–D4).

The U.S. Drought Monitor is a joint effort of the National Drought Mitigation Center, U.S. Department of Agriculture, and National Oceanic and Atmospheric Administration.

Source(s):

NDMC, NOAA, USDA

This map shows precipitation for the past 30 days as a percentage of the historical average (1991–2020) for the same time period. Green/blue shades indicate above-normal precipitation, while brown shades indicate below-normal precipitation.

Source(s):

UC Merced

This map shows the average maximum daily temperature for the past 30 days compared to the historical average (1991–2020) for the same 30 days. Negative values (blue hues) indicate colder than normal temperatures, and positive values (red hues) indicate warmer than normal temperatures.

Source(s):

UC Merced

Drought & Dryness Categories

% of Sonoma County

D0 - Abnormally Dry

D1 – Moderate Drought

D2 – Severe Drought

D3 – Extreme Drought

D4 – Exceptional Drought

Total Area in Drought (D1–D4)

Drought & Dryness Categories
Value	Map Hex Color	Description
D0 - Abnormally Dry	#ffff00	Abnormally Dry Abnormally Dry (D0) indicates a region that is going into or coming out of drought. View typical impacts by state.
D1 – Moderate Drought	#ffcc99	Moderate Drought Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D2 – Severe Drought	#ff6600	Severe Drought Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D3 – Extreme Drought	#ff0000	Extreme Drought Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D4 – Exceptional Drought	#660000	Exceptional Drought Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.
Total Area in Drought (D1–D4)	dmtotal	Total Area in Drought (D1–D4) Percentage of this county that is currently in drought (D1–D4), according to the U.S. Drought Monitor.

Percent of Normal Precipitation (%)

25%

50%

75%

100%

Percent of Normal Precipitation (%)
Range	Map Hex Color	Description
0% - 25%	#8c510a	Precipitation was only 0% to 25% of the historical average for this location, compared to the same date range from 1991–2020.
25% - 50%	#bf812d	25%–50% of Normal Precipitation was 25% to 50% of the historical average for this location, compared to the same date range from 1991–2020.
50% - 75%	#dfc27d	50%–75% of Normal Precipitation was 50% to 75% of the historical average for this location, compared to the same date range from 1991–2020.
75% - 100%	#f6e8c3	75%–100% of Normal Precipitation was 75% to 100% of the historical average for this location, compared to the same date range from 1991–2020.

100%

150%

200%

300%


Range	Map Hex Color	Description
100% - 150%	#c7eae5	100%–150% of Normal Precipitation was 100% to 150% of the historical average for this location, compared to the same date range from 1991–2020.
150% - 200%	#80cdc1	150%–200% of Normal Precipitation was 150% to 200% of the historical average for this location, compared to the same date range from 1991–2020.
200% - 300%	#35978f	200%–300% of Normal Precipitation was 200% to 300% of the historical average for this location, compared to the same date range from 1991–2020.
300% -	#01665e	>300% of Normal Precipitation was greater than 300% of the historical average for this location, compared to the same date range from 1991–2020.

Departure from Normal Max Temperature (°F)

-8

-6

-4

-3

-1

Departure from Normal Max Temperature (°F)
Range	Map Hex Color	Description
- -8	#0404ff	>8°F Below Normal The average maximum temperature was more than 8°F colder than normal for this location.
-8 - -6	#2166ac	6–8°F Below Normal The average maximum temperature was 6–8°F colder than normal for this location.
-6 - -4	#4393c3	4–6°F Below Normal The average maximum temperature was 4–6°F colder than normal for this location.
-4 - -3	#92c5de	3–4°F Below Normal The average maximum temperature was 3–4°F colder than normal for this location.
-3 - -1	#d1e5f0	1–3°F Below Normal The average maximum temperature was 1–3°F colder than normal for this location.
-1 - 0	#ffffff	0–1°F Below Normal The average maximum temperature was 0–1°F colder than normal for this location.


Range	Map Hex Color	Description
0 - 1	#ffffff	0–1°F Above Normal The average maximum temperature was 0–1°F warmer than normal for this location.
1 - 3	#fddbc7	1–3°F Above Normal The average maximum temperature was 1–3°F warmer than normal for this location.
3 - 4	#f4a582	3–4°F Above Normal The average maximum temperature was 3–4°F warmer than normal for this location.
4 - 6	#d6604d	4–6°F Above Normal The average maximum temperature was 4–6°F warmer than normal for this location.
6 - 8	#b2182b	6–8°F Above Normal The average maximum temperature was 6–8°F warmer than normal for this location.
8 -	#800000	>8°F Above Normal The average maximum temperature was more than 8°F warmer than normal for this location.

The U.S. Drought Monitor is a joint effort of the National Drought Mitigation Center, U.S. Department of Agriculture, and National Oceanic and Atmospheric Administration.

Source(s):

NDMC, NOAA, USDA

Source(s):

UC Merced

Source(s):

UC Merced

Data Valid: 12/05/23

Data Valid: 12/07/23

View More National Drought Maps

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Learn more about these data

Multi-Indicator Drought Index (MIDI)

Short-Term

Dry Conditions

Dry Conditions
Value	Map Hex Color	Description
D4	#730000	Exceptional Drought (0–2nd Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 98% to 100% of past conditions. Learn more about these categories.
D3	#E60000	Extreme Drought (2nd–5th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 95% to 98% of past conditions. Learn more about these categories.
D2	#FFAA00	Severe Drought (5th–10th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 90% to 95% of past conditions. Learn more about these categories.
D1	#FCD37F	Moderate Drought (10th–20th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 80% to 90% of past conditions. Learn more about these categories.
D0	#FFFF00	Abnormally Dry (20th–30th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 70% to 80% of past conditions. Learn more about these categories.

Wet Conditions

Wet Conditions
Value	Map Hex Color	Description
W0	#AAFF55	Abnormally Wet (70th–80th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 70% to 80% of past conditions. Learn more about these categories.
W1	#01FFFF	Moderate Wet (80th–90th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 80% to 90% of past conditions. Learn more about these categories.
W2	#00AAFF	Severe Wet (90th–95th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 90% to 95% of past conditions. Learn more about these categories.
W3	#0000FF	Extreme Wet (95th–98th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 95% to 98% of past conditions. Learn more about these categories.
W4	#0000AA	Exceptional Wet (98th–100th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 98% to 100% of past conditions. Learn more about these categories.

Data Valid: 12/01/23

Learn More

Experimental

Long-Term

Dry Conditions

Dry Conditions
Value	Map Hex Color	Description
D4	#730000	Exceptional Drought (0–2nd Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 98% to 100% of past conditions. Learn more about these categories.
D3	#E60000	Extreme Drought (2nd–5th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 95% to 98% of past conditions. Learn more about these categories.
D2	#FFAA00	Severe Drought (5th–10th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 90% to 95% of past conditions. Learn more about these categories.
D1	#FCD37F	Moderate Drought (10th–20th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 80% to 90% of past conditions. Learn more about these categories.
D0	#FFFF00	Abnormally Dry (20th–30th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are drier than 70% to 80% of past conditions. Learn more about these categories.

Wet Conditions

Wet Conditions
Value	Map Hex Color	Description
W0	#AAFF55	Abnormally Wet (70th–80th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 70% to 80% of past conditions. Learn more about these categories.
W1	#01FFFF	Moderate Wet (80th–90th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 80% to 90% of past conditions. Learn more about these categories.
W2	#00AAFF	Severe Wet (90th–95th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 90% to 95% of past conditions. Learn more about these categories.
W3	#0000FF	Extreme Wet (95th–98th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 95% to 98% of past conditions. Learn more about these categories.
W4	#0000AA	Exceptional Wet (98th–100th Percentile) This map integrates multiple drought indices measuring precipitation and moisture into one computer-generated drought map, with a reference period of 1979–present. According to these indices, current conditions are wetter than 98% to 100% of past conditions. Learn more about these categories.

Data Valid: 12/01/23

Learn More

Experimental

Learn more about these data

Agriculture in Sonoma County

Hay Haylage Wheat Cattle Sheep

The USDA's National Agricultural Statistics Service (NASS) conducts hundreds of surveys every year and prepares reports covering virtually every aspect of U.S. agriculture, including agricultural commodities statistics for crops and livestock. This map displays crops and livestock by county alongside the current U.S. Drought Monitor. The size of each dot represents the total acres (crops) or total inventory (livestock) per county. Learn more.

Source(s):

Source(s):

Source(s):

Source(s):

Source(s):

U.S. Drought Monitor

U.S. Drought Monitor
Value	Map Hex Color	Description
D0	#ffff00	D0 - Abnormally Dry Abnormally Dry (D0) indicates a region that is going into or coming out of drought, according to the U.S. Drought Monitor. View typical impacts by state.
D1	#fcd37f	D1 – Moderate Drought Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D2	#fa0	D2 – Severe Drought Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D3	#e60000	D3 – Extreme Drought Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D4	#730000	D4 – Exceptional Drought Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.

U.S. Drought Monitor

U.S. Drought Monitor
Value	Map Hex Color	Description
D0	#ffff00	D0 - Abnormally Dry Abnormally Dry (D0) indicates a region that is going into or coming out of drought, according to the U.S. Drought Monitor. View typical impacts by state.
D1	#fcd37f	D1 – Moderate Drought Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D2	#fa0	D2 – Severe Drought Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D3	#e60000	D3 – Extreme Drought Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D4	#730000	D4 – Exceptional Drought Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.

U.S. Drought Monitor

U.S. Drought Monitor
Value	Map Hex Color	Description
D0	#ffff00	D0 - Abnormally Dry Abnormally Dry (D0) indicates a region that is going into or coming out of drought, according to the U.S. Drought Monitor. View typical impacts by state.
D1	#fcd37f	D1 – Moderate Drought Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D2	#fa0	D2 – Severe Drought Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D3	#e60000	D3 – Extreme Drought Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D4	#730000	D4 – Exceptional Drought Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.

U.S. Drought Monitor

U.S. Drought Monitor
Value	Map Hex Color	Description
D0	#ffff00	D0 - Abnormally Dry Abnormally Dry (D0) indicates a region that is going into or coming out of drought, according to the U.S. Drought Monitor. View typical impacts by state.
D1	#fcd37f	D1 – Moderate Drought Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D2	#fa0	D2 – Severe Drought Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D3	#e60000	D3 – Extreme Drought Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D4	#730000	D4 – Exceptional Drought Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.

U.S. Drought Monitor

U.S. Drought Monitor
Value	Map Hex Color	Description
D0	#ffff00	D0 - Abnormally Dry Abnormally Dry (D0) indicates a region that is going into or coming out of drought, according to the U.S. Drought Monitor. View typical impacts by state.
D1	#fcd37f	D1 – Moderate Drought Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D2	#fa0	D2 – Severe Drought Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D3	#e60000	D3 – Extreme Drought Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D4	#730000	D4 – Exceptional Drought Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.

Crop Production (Acres) or Livestock Count

> 500,000

> 300,000

> 100,000

≤ 100,000

Source(s):

Source(s):

Source(s):

Source(s):

Source(s):

2017 Census of Agriculture data were provided by the USDA National Agricultural Statistics Service. The U.S. Drought Monitor map is produced weekly on Thursday mornings, with data valid through the previous Tuesday at 7 am Eastern.

USDM Updates Weekly: 12/05/23

Learn More

acres of hay in drought (D1–D4) in Sonoma County (estimated)

acres of haylage in drought (D1–D4) in Sonoma County (estimated)

acres of wheat in drought (D1–D4) in Sonoma County (estimated)

number of cattle in drought (D1–D4) in Sonoma County (estimated)

number of sheep in drought (D1–D4) in Sonoma County (estimated)

Learn more about these data

Streamflow & Precipitation in Sonoma County

Streamflow 1-Month Precipitation Outlooks

The U.S. Geological Survey (USGS) produces maps of real-time streamflow conditions compared to historical conditions. The map depicts streamflow conditions as computed at USGS streamgages. The colors represent real-time streamflow compared to percentiles of historical daily streamflow for the day of the year. Click on a streamgage to view more data for that location.

Source(s):

U.S. Geological Survey

This map shows the probability (percent chance) of above-normal, near-normal, or below-normal precipitation over the next calendar month.

Source(s):

CPC

Streamflow Conditions

Low

Much Below

Below

Normal

Streamflow Conditions
Value	Map Hex Color	Description
Low	#ff0000	Record Low Estimated streamflow is the lowest value recorded at this gauge on this day of the year. Learn more.
Much Below	#b12121	Much Below Normal ( Estimated streamflow is in the 0–10th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Below	#ffa400	Below Normal (10th–25th Percentile) Estimated streamflow is in the 10th–25th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Normal	#00ff00	Normal (25th–75th Percentile) Estimated streamflow is in the 25th–75th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.

Above

Much Above

High

Not Ranked


Value	Map Hex Color	Description
Above	#40dfd0	Above Normal (75th–90th Percentile) Estimated streamflow is in the 75th–90th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
Much Above	#0000ff	Much Above Normal (>90th Percentile) Estimated streamflow is in the 90th–100th percentile of historical streamflow values recorded at this gauge on this day of the year. Learn more.
High	#000000	Record High Estimated streamflow is the highest value ever measured at this gauge on this day of the year. Learn more.
Not Ranked	#ffffff	Not Ranked A flow category has not been computed for this gauge, for example due to insufficient historical data or no current streamflow estimates.

Probability (Percent Chance) of Below-Normal Precipitation

100%

90%

80%

70%

60%

50%

40%

33%

Probability (Percent Chance) of Below-Normal Precipitation
Range	Map Hex Color	Description
100% - 90%	#4f2f2f	>90% Chance of Below Normal There is a >90% chance of below-normal precipitation during this period.
90% - 80%	#804000	80%–90% Chance of Below Normal There is an 80%–90% chance of below-normal precipitation during this period.
80% - 70%	#934639	70%–80% Chance of Below Normal There is an 70%–80% chance of below-normal precipitation during this period.
70% - 60%	#9b5031	60%–70% Chance of Below Normal There is an 60%–70% chance of below-normal precipitation during this period.
60% - 50%	#bb6d33	50%–60% Chance of Below Normal There is an 50%–60% chance of below-normal precipitation during this period.
50% - 40%	#d8a750	40%–50% Chance of Below Normal There is an 40%–50% chance of below-normal precipitation during this period.
40% - 33%	#f0d493	33%–40% Chance of Below Normal There is an 33%–40% chance of below-normal precipitation during this period.

Probability (Percent Chance) of Above-Normal Precipitation

33%

40%

50%

60%

70%

80%

90%

100%

Probability (Percent Chance) of Above-Normal Precipitation
Range	Map Hex Color	Description
33% - 40%	#b3d9ab	33%–40% Chance of Above Normal There is an 33%–40% chance of above-normal precipitation during this period.
40% - 50%	#94cd7e	40%–50% Chance of Above Normal There is an 40%–50% chance of above-normal precipitation during this period.
50% - 60%	#48ae38	50%–60% Chance of Above Normal There is an 50%–60% chance of above-normal precipitation during this period.
60% - 70%	#3a7b5f	60%–70% Chance of Above Normal There is an 60%–70% chance of above-normal precipitation during this period.
70% - 80%	#008e40	70%–80% Chance of Above Normal There is an 70%–80% chance of above-normal precipitation during this period.
80% - 90%	#28553d	80%–90% Chance of Above Normal There is an 80%–90% chance of above-normal precipitation during this period.
90% - 100%	#285517	>90% Chance of Above Normal There is a >90% chance of above-normal precipitation during this period.

Updates Daily:

Updates Monthly: 11/30/23

Learn More

percent of streamflow sites that are below normal in California

percent of streamflow sites that are above normal in California

percent area of California with above normal precipitation probability this month

percent area of California with below normal precipitation probability this month

Learn more about these data

Public Health in Sonoma County

Social Vulnerability Index AirNow Air Quality Index

This map shows the Center for Disease Control and Prevention's (CDC's) Social Vulnerability Index alongside current U.S. Drought Monitor drought designations. CDC's Social Vulnerability Index uses 15 U.S. census variables at tract level (including poverty, lack of vehicle access, and crowded housing) to help local officials identify communities that may need support in preparing for or recovering from hazards, like drought. Learn more.

Source(s):

Centers for Disease Control and Prevention

The U.S. Air Quality Index (AQI) is designed to communicate whether air quality is healthy or unhealthy. This map displays the AQI at sensors across the U.S. alongside the current U.S. Drought Monitor, as of 10 a.m. Eastern.

Source(s):

AirNow

Social Vulnerability Index (SVI)

0.7501 - 1 | Highest Vulnerability

0.5001 - 0.75

0.2501 - 0.5

0 - 0.25 | Lowest Vulnerability

Data Unavailable

Social Vulnerability Index (SVI)
Value	Map Hex Color
0.7501 - 1 \| Highest Vulnerability	#265C9E
0.5001 - 0.75	#42ABB6
0.2501 - 0.5	#96C9A7
0 - 0.25 \| Lowest Vulnerability	#EBEBBE
Data Unavailable	#909090

U.S. Drought Monitor

U.S. Drought Monitor
Value	Map Hex Color
D0	#ffff00
D1	#ffcc99
D2	#ff6600
D3	#ff0000
D4	#660000

Air Quality

Good

Moderate

Unhealthy for Sensitive Groups

Air Quality
Value	Map Hex Color	Description
Good	#01e400	AQI 0 to 50: Good Air quality is satisfactory, and air pollution poses little or no risk. Learn more.
Moderate	#ffff00	AQI 51 to 100: Moderate Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. Learn more.
Unhealthy for Sensitive Groups	#ff7e00	AQI 101 to 150: Unhealthy for Sensitive Groups Members of sensitive groups may experience health effects. The general public is less likely to be affected. Learn more.

Unhealthy

Very Unhealthy

Hazardous


Value	Map Hex Color	Description
Unhealthy	#ff0000	AQI 151 to 200: Unhealthy Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. Learn more.
Very Unhealthy	#8f3f97	AQI 201 to 300: Very Unhealthy Health alert: The risk of health effects is increased for everyone. Learn more.
Hazardous	#7e0023	AQI >301: Hazardous Health warning of emergency conditions: everyone is more likely to be affected. Learn more.

U.S. Drought Monitor

U.S. Drought Monitor
Value	Map Hex Color	Description
D0	#ffff00	D0 - Abnormally Dry Abnormally Dry (D0) indicates a region that is going into or coming out of drought, according to the U.S. Drought Monitor. View typical impacts by state.
D1	#fcd37f	D1 – Moderate Drought Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D2	#fa0	D2 – Severe Drought Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D3	#e60000	D3 – Extreme Drought Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D4	#730000	D4 – Exceptional Drought Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.

Data Valid: 12/05/23

Data Valid: 12/08/23

Learn More

0.40

Social Vulnerability Index Score

Heat Warning issued by the National Weather Service

Air Quality Warning issued by the National Weather Service

No Wildfire

in Sonoma

Learn more about these data

Learn more ›

Future Conditions for Sonoma County

Quantitative Precipitation Forecast

1-Day 7-Day

Predicted Inches of Precipitation

0.01

0.1

0.25

0.5

0.75

1.25

1.5

1.75

Predicted Inches of Precipitation
Range	Map Hex Color
0 - 0.01	#ffffff
0.01 - 0.1	#7fff00
0.1 - 0.25	#00cd00
0.25 - 0.5	#008b00
0.5 - 0.75	#104e8b
0.75 - 1	#1e90ff
1 - 1.25	#00b2ee
1.25 - 1.5	#00eeee
1.5 - 1.75	#8968cd

1.75

2.5


Range	Map Hex Color
1.75 - 2	#912cee
2 - 2.5	#8b008b
2.5 - 3	#8b0000
3 - 4	#cd0000
4 - 5	#ee4000
5 - 7	#ff7f00
7 - 10	#cd8500
10 - 15	#ffd700
15 - 20	#ffff00
20 -	#ffaeb9

Predicted Inches of Precipitation

0.01

0.1

0.25

0.5

0.75

1.25

1.5

1.75

Predicted Inches of Precipitation
Range	Map Hex Color
0 - 0.01	#ffffff
0.01 - 0.1	#7fff00
0.1 - 0.25	#00cd00
0.25 - 0.5	#008b00
0.5 - 0.75	#104e8b
0.75 - 1	#1e90ff
1 - 1.25	#00b2ee
1.25 - 1.5	#00eeee
1.5 - 1.75	#8968cd

1.75

2.5


Range	Map Hex Color
1.75 - 2	#912cee
2 - 2.5	#8b008b
2.5 - 3	#8b0000
3 - 4	#cd0000
4 - 5	#ee4000
5 - 7	#ff7f00
7 - 10	#cd8500
10 - 15	#ffd700
15 - 20	#ffff00
20 -	#ffaeb9

Data Valid: 12/08/23

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U.S. Drought Outlooks

Monthly Seasonal

Drought Is Predicted To...

Persist

Improve

End

Develop

N/A

Drought Is Predicted To...
Value	Map Hex Color	Description
Persist	#9b634a	Drought Persists During this time period, drought is forecast to persist.
Improve	#ded2bc	Drought Improves During this time period, drought is forecast to improve.
End	#b2ad69	Drought Is Removed During this time period, drought removal is forecast.
Develop	#ffde63	Drought Develops During this time period, drought development is forecast.
N/A	#ffffff	No Drought Present

Drought Is Predicted To...

Persist

Improve

End

Develop

N/A

Drought Is Predicted To...
Value	Map Hex Color	Description
Persist	#9b634a	Drought Persists During this time period, drought is forecast to persist.
Improve	#ded2bc	Drought Improves During this time period, drought is forecast to improve.
End	#b2ad69	Drought Is Removed During this time period, drought removal is forecast.
Develop	#ffde63	Drought Develops During this time period, drought development is forecast.
N/A	#ffffff	No Drought Present

Data Valid: 11/30/23

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Historical Conditions for Sonoma County

2000–Present

1895–Present

0 –2017

Time Period (Years): to

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U.S. Drought Monitor

U.S. Drought Monitor
Value	Map Hex Color	Description
D0	#ffff00	D0 - Abnormally Dry Abnormally Dry (D0) indicates a region that is going into or coming out of drought, according to the U.S. Drought Monitor. View typical impacts by state.
D1	#fcd37f	D1 – Moderate Drought Moderate Drought (D1) is the first of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D2	#fa0	D2 – Severe Drought Severe Drought (D2) is the second of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D3	#e60000	D3 – Extreme Drought Extreme Drought (D3) is the third of four drought categories (D1–D4), according to the U.S. Drought Monitor. View typical impacts by state.
D4	#730000	D4 – Exceptional Drought Exceptional Drought (D4) is the most intense drought category, according to the U.S. Drought Monitor. View typical impacts by state.

The U.S. Drought Monitor (2000–present) depicts the location and intensity of drought across the country. Every Thursday, authors from NOAA, USDA, and the National Drought Mitigation Center produce a new map based on their assessments of the best available data and input from local observers. The map uses five categories: Abnormally Dry (D0), showing areas that may be going into or are coming out of drought, and four levels of drought (D1–D4). Learn more.

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Dry Conditions

Dry Conditions
Value	Map Hex Color	Description
D4	#730000	D4 (SPI of -2.0 or less) The 9-month Standardized Precipitation Index (SPI) value for this location is -2.0 or less, indicating exceptional drought (D4) conditions.
D3	#E60000	D3 (SPI of -1.9 to -1.6) The Standardized Precipitation Index (SPI) value for this location is between -1.9 to -1.6, indicating extreme drought (D3) conditions.
D2	#FFAA00	D2 (SPI of -1.5 to -1.3) The Standardized Precipitation Index (SPI) value for this location is between -1.5 to -1.3, indicating severe drought (D2) conditions.
D1	#FCD37F	D1 (SPI of -1.2 to -0.8) The Standardized Precipitation Index (SPI) value for this location is between -1.2 to -0.8, indicating moderate drought (D1) conditions.
D0	#FFFF00	D0 (SPI of -0.7 to -0.5) The Standardized Precipitation Index (SPI) value for this location is between -0.7 to -0.5, indicating abnormally dry (D0) conditions.

Wet Conditions

Wet Conditions
Value	Map Hex Color	Description
W0	#AAFF55	W0 (SPI of 0.5 to 0.7) The Standardized Precipitation Index (SPI) value for this location is between 0.5 to 0.7, indicating abnormally wet (W0) conditions.
W1	#01FFFF	W1 (SPI of 0.8 to 1.2) The Standardized Precipitation Index (SPI) value for this location is between 0.8 to 1.2, indicating moderate wet (W1) conditions.
W2	#00AAFF	W2 (SPI of 1.3 to 1.5) The Standardized Precipitation Index (SPI) value for this location is between 1.3 to 1.5, indicating severe wet (W2) conditions.
W3	#0000FF	W3 (SPI of 1.6 to 1.9) The Standardized Precipitation Index (SPI) value for this location is between 1.6 to 1.9, indicating extreme wet (W3) conditions.
W4	#0000AA	W4 (SPI of 2.0 or more) The Standardized Precipitation Index (SPI) value for this location is 2.0 or greater, indicating exceptional wet (W4) conditions.

Drought results from an imbalance between water supply and water demand. The Standardized Precipitation Index (SPI) measures water supply, specifically precipitation. SPI captures how observed precipitation (rain, hail, snow) deviates from the climatological average over a given time period—in this case, over the 9 months leading up to the selected date. Red hues indicate drier conditions, while blue hues indicate wetter conditions. Data are available monthly from 1895–present. Learn more.

Time Period (Years): to

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Dry Conditions

Dry Conditions
Value	Map Hex Color	Description
D4	#730000	D4 (PMDI of -5.0 or less) Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is -5.0 or less, indicating exceptional drought (D4) conditions.
D3	#E60000	D3 (PMDI of -4.9 to -4.0) Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is -4.9 to -4.0, indicating extreme drought (D3) conditions.
D2	#FFAA00	D2 (PMDI of -3.9 to -3.0) Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is -3.9 to -3.0, indicating severe drought (D2) conditions.
D1	#FCD37F	D1 (PMDI of -2.9 to -2.0) Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is -2.9 to -2.0, indicating moderate drought (D1) conditions.
D0	#FFFF00	D0 (PMDI of -1.9 to -1.0) Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is -1.9 to -1.0, indicating abnormally dry (D0) conditions.

Wet Conditions

Wet Conditions
Value	Map Hex Color	Description
W0	#AAFF55	W0 (PMDI of 1.0 to 1.9) Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is 1.0 to 1.9, indicating abnormally wet (W0) conditions.
W1	#01FFFF	W1 (PMDI of 2.0 to 2.9) Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is 2.0 to 2.9, indicating moderate wet (W1) conditions.
W2	#00AAFF	W2 (PMDI of 3.0 to 3.9) Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is 3.0 to 3.9, indicating severe wet (W2) conditions.
W3	#0000FF	W3 (PMDI of 4.0 to 4.9) Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is 4.0 to 4.9, indicating extreme wet (W3) conditions.
W4	#0000AA	W4 (PMDI of 5.0 or greater) Tree rings were used to reconstruct a Palmer Modified Drought Index (PMDI) value for each June–August, estimating relative dryness. The PMDI value for this location is 5.0 or greater, indicating exceptional wet (W4) conditions.

In paleoclimatology, proxy climate data (e.g., tree rings, ocean sediments) can allow us to reconstruct past climate conditions before we had widespread instrumental records. The Living Blended Drought Atlas, shown here, estimates average drought conditions each summer (June–August) as far back as the year 0 by combining tree-ring reconstructions and instrumental records. Red hues indicate drier conditions, while blue hues indicate wetter conditions.

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Drought Conditions for Sonoma County

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