The Berkeley Weather Station is a senior member of the national Cooperative Weather Observation Program (CWOP). We collect daily maximum and minimum temperature data and precipitation totals, measured from midnight to midnight. The Berkeley station is one of roughly 8,700 volunteer-run weather observation sites scattered across the country that provide long-term data sets used to model changes in climate.

The Berkeley station has maintained a nearly unbroken sequence of temperature and precipitation observations since 1890. Early observations were recorded by the Department of Astronomy on Observatory Hill, just east of what is now McCone Hall. The Department of Geography assumed station duties in 1912. Berkeley observations are compiled monthly. This monthly record is reported to the National Climate Data Center and is made available to anyone upon request.

The Berkeley Weather Station is the oldest continuously operating weather observing station in California. For more information, contact Dan Plumlee at