San Mateo County, California gets 25 inches of rain, on average, per year. The US average is 38 inches of rain per year.
San Mateo County averages 0 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 260 sunny days per year in San Mateo County. The US average is 205 sunny days.
San Mateo County gets some kind of precipitation, on average, 71 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Summer High: the July high is around 75 degrees
Winter Low: the January low is 42
Rain: averages 25 inches of rain a year
Snow: averages 0 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for San Mateo County is 8.4 (10=best), which means it is more comfortable than most places in California.
8.4 / 10
September, August and July are the most pleasant months in San Mateo County, while January and December are the least comfortable months.