St. Helena, California gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.
St. Helena averages 0 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 263 sunny days per year in St. Helena. The US average is 205 sunny days.
St. Helena 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 89 degrees
Winter Low: the January low is 38
Rain: averages 37 inches of rain a year
Snow: averages 0 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for St. Helena is 8.3 (10=best), which means it is more comfortable than most places in California.
8.9 / 7.1
Summer / Winter
June, May and October are the most pleasant months in St. Helena, while December and January are the least comfortable months.