The Office of Water Resources maintains a network of approximately 60 precipitation observation stations throughout Massachusetts. We also collect data from the National Weather Service’s online tool NOWData, which includes daily data (http://w2.weather.gov/climate/xmacis.php?wfo=box and http://w2.weather.gov/climate/xmacis.php?wfo=aly for Berkshire County). Some of the data collected are used to compare current conditions to historic precipitation patterns. This helps us determine when precipitation is above or below normal. We also maintain a precipitation database, which may be used for many purposes and is available to the public.
Precipitation Composite Estimates
We use some DCR precipitation data, as well as some National Weather Service data, to calculate a composite of precipitation conditions in six regions, plus a statewide composite. Monthly Water Conditions
DCR's Office of Water Resources maintains a precipitation database that is updated monthly using reports from our observers and cooperative agencies. Precipitation values in the database are totals for each station for each month. Snow and ice are melted and reported as inches of water.
Data from the Precipitation Database is currently available to the public in Microsoft Excel format. Data is sorted alphabetically by station and then listed by year. Note: The unit used for precipitation data is inches.
Precipitation Database Data 2015 0323 file size 3MB
If you have any questions, please contact:
Standardized Precipitation Index (SPI)
The Standardized Precipitation Index (SPI) is one of seven indices used by the Massachusetts Drought Management Task Force to determine the level of drought severity. See more...
Links to our cooperator's sites and to sites for more information on water resources and precipitation.