St. Helena, CA Climate


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United States / California / Napa Metro Area / Napa County / St. Helena / Zip Codes
St. Helena, CA has a Mediterranean climate with mild winters and hot, dry summers. The average daily high temperature during the summer months is in the 70s and 80s Fahrenheit, while winter temperatures rarely dip below the mid-50s. Precipitation is low throughout the year, with an annual average of around 20 inches of rain annually. During the summer months, humidity can become quite high due to its proximity to the Pacific Ocean.

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.

8.9 Summer - 7.1 Winter
June, May and October are the most pleasant months in St. Helena, while December and January are the least comfortable months.

  ClimateSt. Helena, CaliforniaUnited States
  37.1 in.38.1 in.
  0.0 in.27.8 in.
  70.5 days106.2 days
  263 days205 days
  88.8°85.8°
  37.6°21.7°
  8.37
  5.44.3
  253 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

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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Michelle M · St. Helena, CA
St.Helena is the best!
Over 3 years ago

There is no better place to raise a family. Great community, excellent resources, fabulous restaurants, amazing hikes and beautiful scenery.  More

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Chelsea  · Batavia, NY
Where to go?
Over 18 years ago

I currently live in Sacramento, California for about 5 months and returning to batavia, New York in 5 more months. My boyfriend and I are going to get a place together  More

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