PRISM Climate Data
2015-09-10 Notice:  Revised precipitation dataset
An inconsistency in the new PRISM precipitation grids has been found that affects parts of the central and eastern US for the years 2002-present. We suggest you re-download the precipitation grids for these years to obtain the corrected version that is now online. We apologize for the inconvenience.

The PRISM Climate Group gathers climate observations from a wide range of monitoring networks, applies sophisticated quality control measures, and develops spatial climate datasets to reveal short- and long-term climate patterns. The resulting datasets incorporate a variety of modeling techniques and are available at multiple spatial/temporal resolutions, covering the period from 1895 to the present. Whenever possible, we offer these datasets to the public, either free of charge or for a fee (depending on dataset size/complexity and funding available for the activity).

30-Year Normals: At the end of each decade, average values for temperature and precipitation are computed over the preceding 30 years. The current set of 30-year normals covers the period 1981-2010.

Comparisons: Maps showing how observed values have been deviating from long-term conditions (also known as anomalies) - includes the new Drought Indicator tool.

This Month: Although still very preliminary, results based on daily data readings are available for the month-in-progress.

Prior 6 Months: Provisional results based on both monthly and daily data are available for the 6 most recently completed months.

Recent Years: Daily and monthly observations become stabilized after 6 months. At that point the time series datasets are posted in this section, along with annual values computed at the end of each year.

Historical Past: Values prior to 1981 are based on less extensive observations. Time series datasets computed using monthly modeling are available for the years 1895-1990.

Gallery of State Maps: Prepared map images for each state in the continental US.

Data Explorer: analyze and download time-series data for a single location.

FAQ: Answers to frequently asked questions

This website is supported by the USDA Risk Management Agency