Relative Effective Annual Precipitation Data
This web site provides access to Relative Effective Annual Precipitation (REAP) data for Montana. The data was created by the Montana Natural Resources Conservation Service. REAP is an indicator of the amount of moisture available at a location, taking into account precipitation, slope and aspect, and soil properties. Two sites that receive the same amount of precipitation may have very different effective precipitation due to other site factors.
REAP values were developed for each Montana county by the Natural Resources Conservation Service (NRCS) using a process that included:
DAYMET is a model that generates daily surfaces of temperature, precipitation, humidity, and radiation over large regions of complex terrain. DAYMET was developed at the University of Montana, Numerical Terradynamic Simulation Group (NTSG).
TAPS are Temperature and Precipitation Summary tables developed by the National Water and Climate Center (NWCC).