Contra Costa County, California gets 21 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Contra Costa 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 Contra Costa County. The US average is 205 sunny days.
Contra Costa County gets some kind of precipitation, on average, 62 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 84 degrees
Winter Low: the January low is 40
Rain: averages 21 inches of rain a year
Snow: averages 0 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for Contra Costa County is 8.5 (10=best), which means it is more comfortable than most places in California.
8.5 / 10
June, September and May are the most pleasant months in Contra Costa County, while January and December are the least comfortable months.