Climate in Napa County, California

Napa County, California gets 33 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Napa County averages 0 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 262 sunny days per year in Napa County. The US average is 205 sunny days.

Napa County gets some kind of precipitation, on average, 69 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 87 degrees
Winter Low: the January low is 38
Rain: averages 33 inches of rain a year
Snow: averages 0 inches of snow a year

BESTPLACES COMFORT INDEX

The annual BestPlaces Comfort Index for Napa County is 8.3 (10=best), which means it is more comfortable than most places in California.

August is the hottest month for Napa County with an average high temperature of 86.9°, which ranks it as cooler than most places in California. In Napa County, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Napa County are October, May and June.

In Napa County, there are 42.3 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 Napa County with an average of 37.3°. This is about average compared to other places in California.

In Napa County, there are 22.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in California.

In Napa County, 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 Napa County 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.

December is the wettest month in Napa County with 6.5 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 33.2 inches in Napa County means that it is wetter than most places in California.

December is the rainiest month in Napa County with 11.7 days of rain, and July is the driest month with only 0.1 rainy days. There are 68.8 rainy days annually in Napa County, 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 Napa County, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in Napa County.

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