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

Associated Agencies

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

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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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)
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

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