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HOME > U.S. Drought > Drought Indices: Standardized Precipitation Index

Drought Indices
Standardized Precipitation Index
Recent Observations
18Nov2024
Topo Map
3 month Standardized Precipitation Index
6 month Standardized Precipitation Index
12 month Standardized Precipitation Index
24 month Standardized Precipitation Index
Boundaries
Rivers
Legend
             
Notes about this product:
  • Drought classification: D1 -0.8 > SPI > -1.2; D2 -1.3 > SPI > -1.5; D3 -1.6 > SPI > -1.9; and D4 SPI < -2.
  • Data source: CPC Unified Precipitation Analysis (1950-present)
  • GeoTIFF: Undefined value is -999.
 Related Links: Contacts: Muthuvel Chelliah (Muthuvel.Chelliah@noaa.gov) & Li Xu (li.xu@noaa.gov)


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