What are long term precipitation data sources?

The Snow Telemetry (SNOTEL) Network is composed of over 900 automated data collection sites located in remote, high-elevation mountain watersheds in the western U.S. They are used to monitor snowpack, precipitation, temperature, and other climatic conditions, and to make water supply forecasts. Source: NRCS

SNOTEL snowpack and water supply data can be found here.

Explore precipitation climate data from SNOTEL and historical sites located within the Central Wasatch Mountains.

Historical SNOTEL Precipitation Data

Historical Weather Station Precipitation Data