Climate in St. Helena, California

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.

Weather Highlights

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.

July is the hottest month for St. Helena with an average high temperature of 88.8°, which ranks it as about average compared to other places in California. In St. Helena, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Helena are October, May and April.

In St. Helena, there are 49.9 days annually when the high temperature is over 90°, which is about average compared to other places in California.

December has the coldest nighttime temperatures for St. Helena with an average of 37.1°. This is about average compared to other places in California.

In St. Helena, there are 22.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in California.

In St. Helena, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

Humidity in St. Helena is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are July, August and June.

February is the wettest month in St. Helena with 7.3 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 37.1 inches in St. Helena means that it is wetter than most places in California.

January is the rainiest month in St. Helena with 11.9 days of rain, and July is the driest month with only 0.2 rainy days. There are 70.5 rainy days annually in St. Helena, which is rainier than most places in California. The rainiest season is Spring when it rains 49% of the time and the driest is Autumn with only a 2% chance of a rainy day.

There is rarely any recorded snowfall in St. Helena, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in St. Helena.

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