Multi-Scale Standardized Precipitation Index Time Series Plots

The Standardized Precipitation Index (SPI) is a useful tool for monitoring drought at multiple timescales. Short-term drought conditions can impact agricultural activities while long-term drought can impact water resources. Given these different timescales, varying intensities of drought and even lack of drought can exist at the same time.

The plots below are created by calculating the SPI value at all timescales between one and sixty months for each month using National Climatic Data Center climate division precipitation data. They are updated on the 12th of the month to incorporate the previous month's data (see NOAA NCEI release schedule).

Please contact Mike Crimmins with comments/questions

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Northern Rockies Plains

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