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

Drought Indices
Standardized Precipitation Index
Recent Observations
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3 month Standardized Precipitation Index
6 month Standardized Precipitation Index
12 month Standardized Precipitation Index
24 month Standardized Precipitation Index
Notes about this product:
  • Drought classification: D1 -0.8 > SPI > -1.2; D2 -1.3 > SPI > -1.5; D3 -1.6 > SPI > -1.8; and D4 SPI < -2.
  • Data source: CPC Unified Precipitation Analysis (1950-present)
  • GeoTIFF: Undefined value is -999.
Related Links:
Contacts: Kingtse Mo (Kingtse.Mo@noaa.gov) & Li-Chuan Chen (lichuan.chen@noaa.gov)

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Page Author: Climate Prediction Center Internet Team
Page last modified: February 27, 2013
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