Precipitation & Evaporation
Monthly and annual precipitation and lake evaporation rates are provided at this site for each one-degree quadrangle in and adjacent to Texas. Precipitation data are available from 1940 through 2011 while gross lake surface evaporation data are available from 1954 through 2011. These quadrangle data were computed from all available raw data collected by the National Weather Service and by the Texas Water Development Board. More information on the computing program is available.