Data & Maps

U.S. Gridded Standardized Precipitation Index (SPI) from nClimGrid-Daily

National Oceanic and Atmospheric Administration (NOAA) National Centers for Environmental Information (NCEI)

Contiguous U.S.

Land-based Station

1951 – Present

text (ascii)

csv

netcdf-4

The U.S. Gridded Standardized Precipitation Index (SPI) is derived from the nClimGrid-Daily dataset and includes timescales of 1, 2, and 3 weeks, as well as 1, 2, 3, 4, 6, 9, and 12 months.

The nClimGrid-Daily dataset is a gridded dataset, produced by NOAA's National Centers for Environmental Information, that includes area averages of daily maximum, minimum, and average temperatures and daily precipitation amounts for the contiguous United States from January 1, 1951 to the present. Data are derived from morning and midnight observations from the Global Historical Climatology Network-Daily (GHCNd) dataset, and contain processing techniques that address the spatial and temporal variations that affect the quality and homogeneity of the fields.

Interactive Map: Standardized Precipitation Index (SPI)

1-Month 2-Month 3-Month 6-Month 9-Month 12-Month

Dry Conditions (Index Range)

D4 (-2.0 or less)

D3 (-1.6 to -1.9)

D2 (-1.3 to -1.5)

D1 (-0.8 to -1.2)

D0 (-0.5 to -0.7)

Dry Conditions (Index Range)
Value	Map Hex Color
D4 (-2.0 or less)	#730000
D3 (-1.6 to -1.9)	#E60000
D2 (-1.3 to -1.5)	#FFAA00
D1 (-0.8 to -1.2)	#FCD37F
D0 (-0.5 to -0.7)	#FFFF00

Neutral Conditions (Index Range)
Value	Map Hex Color
(-0.5 to 0.5)	#fafafa

Wet Conditions (Index Range)

W0 (0.5 to 0.7)

W1 (0.8 to 1.2)

W2 (1.3 to 1.5)

W3 (1.6 to 1.9)

W4 (2.0 or more)

Wet Conditions (Index Range)
Value	Map Hex Color
W0 (0.5 to 0.7)	#AAFF55
W1 (0.8 to 1.2)	#01FFFF
W2 (1.3 to 1.5)	#00AAFF
W3 (1.6 to 1.9)	#0000FF
W4 (2.0 or more)	#0000AA

Dry Conditions (Index Range)

D4 (-2.0 or less)

D3 (-1.6 to -1.9)

D2 (-1.3 to -1.5)

D1 (-0.8 to -1.2)

D0 (-0.5 to -0.7)

Dry Conditions (Index Range)
Value	Map Hex Color
D4 (-2.0 or less)	#730000
D3 (-1.6 to -1.9)	#E60000
D2 (-1.3 to -1.5)	#FFAA00
D1 (-0.8 to -1.2)	#FCD37F
D0 (-0.5 to -0.7)	#FFFF00

Neutral Conditions (Index Range)
Value	Map Hex Color
(-0.5 to 0.5)	#fafafa

Wet Conditions (Index Range)

W0 (0.5 to 0.7)

W1 (0.8 to 1.2)

W2 (1.3 to 1.5)

W3 (1.6 to 1.9)

W4 (2.0 or more)

Wet Conditions (Index Range)
Value	Map Hex Color
W0 (0.5 to 0.7)	#AAFF55
W1 (0.8 to 1.2)	#01FFFF
W2 (1.3 to 1.5)	#00AAFF
W3 (1.6 to 1.9)	#0000FF
W4 (2.0 or more)	#0000AA

Dry Conditions (Index Range)

D4 (-2.0 or less)

D3 (-1.6 to -1.9)

D2 (-1.3 to -1.5)

D1 (-0.8 to -1.2)

D0 (-0.5 to -0.7)

Dry Conditions (Index Range)
Value	Map Hex Color
D4 (-2.0 or less)	#730000
D3 (-1.6 to -1.9)	#E60000
D2 (-1.3 to -1.5)	#FFAA00
D1 (-0.8 to -1.2)	#FCD37F
D0 (-0.5 to -0.7)	#FFFF00

Neutral Conditions (Index Range)
Value	Map Hex Color
(-0.5 to 0.5)	#fafafa

Wet Conditions (Index Range)

W0 (0.5 to 0.7)

W1 (0.8 to 1.2)

W2 (1.3 to 1.5)

W3 (1.6 to 1.9)

W4 (2.0 or more)

Wet Conditions (Index Range)
Value	Map Hex Color
W0 (0.5 to 0.7)	#AAFF55
W1 (0.8 to 1.2)	#01FFFF
W2 (1.3 to 1.5)	#00AAFF
W3 (1.6 to 1.9)	#0000FF
W4 (2.0 or more)	#0000AA

Dry Conditions (Index Range)

D4 (-2.0 or less)

D3 (-1.6 to -1.9)

D2 (-1.3 to -1.5)

D1 (-0.8 to -1.2)

D0 (-0.5 to -0.7)

Dry Conditions (Index Range)
Value	Map Hex Color
D4 (-2.0 or less)	#730000
D3 (-1.6 to -1.9)	#E60000
D2 (-1.3 to -1.5)	#FFAA00
D1 (-0.8 to -1.2)	#FCD37F
D0 (-0.5 to -0.7)	#FFFF00

Neutral Conditions (Index Range)
Value	Map Hex Color
(-0.5 to 0.5)	#fafafa

Wet Conditions (Index Range)

W0 (0.5 to 0.7)

W1 (0.8 to 1.2)

W2 (1.3 to 1.5)

W3 (1.6 to 1.9)

W4 (2.0 or more)

Wet Conditions (Index Range)
Value	Map Hex Color
W0 (0.5 to 0.7)	#AAFF55
W1 (0.8 to 1.2)	#01FFFF
W2 (1.3 to 1.5)	#00AAFF
W3 (1.6 to 1.9)	#0000FF
W4 (2.0 or more)	#0000AA

Dry Conditions (Index Range)

D4 (-2.0 or less)

D3 (-1.6 to -1.9)

D2 (-1.3 to -1.5)

D1 (-0.8 to -1.2)

D0 (-0.5 to -0.7)

Dry Conditions (Index Range)
Value	Map Hex Color
D4 (-2.0 or less)	#730000
D3 (-1.6 to -1.9)	#E60000
D2 (-1.3 to -1.5)	#FFAA00
D1 (-0.8 to -1.2)	#FCD37F
D0 (-0.5 to -0.7)	#FFFF00

Neutral Conditions (Index Range)
Value	Map Hex Color
(-0.5 to 0.5)	#fafafa

Wet Conditions (Index Range)

W0 (0.5 to 0.7)

W1 (0.8 to 1.2)

W2 (1.3 to 1.5)

W3 (1.6 to 1.9)

W4 (2.0 or more)

Wet Conditions (Index Range)
Value	Map Hex Color
W0 (0.5 to 0.7)	#AAFF55
W1 (0.8 to 1.2)	#01FFFF
W2 (1.3 to 1.5)	#00AAFF
W3 (1.6 to 1.9)	#0000FF
W4 (2.0 or more)	#0000AA

Dry Conditions (Index Range)

D4 (-2.0 or less)

D3 (-1.6 to -1.9)

D2 (-1.3 to -1.5)

D1 (-0.8 to -1.2)

D0 (-0.5 to -0.7)

Dry Conditions (Index Range)
Value	Map Hex Color
D4 (-2.0 or less)	#730000
D3 (-1.6 to -1.9)	#E60000
D2 (-1.3 to -1.5)	#FFAA00
D1 (-0.8 to -1.2)	#FCD37F
D0 (-0.5 to -0.7)	#FFFF00

Neutral Conditions (Index Range)
Value	Map Hex Color
(-0.5 to 0.5)	#fafafa

Wet Conditions (Index Range)

W0 (0.5 to 0.7)

W1 (0.8 to 1.2)

W2 (1.3 to 1.5)

W3 (1.6 to 1.9)

W4 (2.0 or more)

Wet Conditions (Index Range)
Value	Map Hex Color
W0 (0.5 to 0.7)	#AAFF55
W1 (0.8 to 1.2)	#01FFFF
W2 (1.3 to 1.5)	#00AAFF
W3 (1.6 to 1.9)	#0000FF
W4 (2.0 or more)	#0000AA

Last Updated - 01/18/23

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Datasets are in netCDF format.
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Documentation

nClimGrid-Daily Metadata
User Guide: Provides basic information, references with additional information, and points of contact for the collection and processing of nClimGrid-Daily.
Journal Article: Durre, Imke, Anthony Arguez, Carl J. Schreck III, Michael F. Squires, and Russell S. Vose. (2022.) Daily High-Resolution Temperature and Precipitation Fields for the Contiguous United States from 1951 to Present. Journal of Atmospheric and Oceanic Technology.

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