Average monthly snow and rainfall in San Bruno (CA)
The mean monthly precipitation over the year in San Bruno (California), including rain, snow, hail.
- Most rainfall (rainy season) is seen in December.
- San Bruno has dry periods in May, June, July, August, September and October.
- On average, December is the wettest month with 113 mm of precipitation.
- On average, July is the driest month with 1 mm of precipitation.
- The average amount of annual precipitation is 481 mm.
Weather Forecasts for San Bruno (CA)
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