Fullerton, California 

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Climate in Fullerton, California

Fullerton, California gets 14 inches of rain, on average, per year. The US average is 38 inches of rain per year.

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

On average, there are 283 sunny days per year in Fullerton. The US average is 205 sunny days.

Fullerton gets some kind of precipitation, on average, 32 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 85 degrees
Winter Low: the January low is 46
Rain: averages 14 inches of rain a year
Snow: averages 0 inches of snow a year


The annual BestPlaces Comfort Index for Fullerton is 9.3 (10=best), which means it is one of the most pleasant places in California.

9.6 / 8.8

Summer   /   Winter
June, May and October are the most pleasant months in Fullerton, while January and December are the least comfortable months.

Climate Averages
  Fullerton, CaliforniaUnited States
  13.9 in.38.1 in.
  0.0 in.27.8 in.
  32.3 days106.2 days
  283 days205 days
  164 ft.2443 ft.


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.

August is the hottest month for Fullerton with an average high temperature of 86.7°, which ranks it as cooler than most places in California. In Fullerton, there are 7 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Fullerton are May, June and October.

In Fullerton, there are 32.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

December has the coldest nighttime temperatures for Fullerton with an average of 45.7°. This is one of the warmest places in California.

In Fullerton, there are 0.2 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in California.

In Fullerton, 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 Fullerton 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 August, July and September.

February is the wettest month in Fullerton with 3.2 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 61% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 13.9 inches in Fullerton means that it is drier than most places in California.

January is the rainiest month in Fullerton with 6.3 days of rain, and August is the driest month with only 0.2 rainy days. There are 32.3 rainy days annually in Fullerton, which is less rainy than most places in California. The rainiest season is Spring when it rains 54% of the time and the driest is Autumn with only a 3% chance of a rainy day.

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

  • Annual Rainfall (US Avg: 36.5")
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    Reviews for Fullerton    13 Reviews
    love it - 4/7/2021
    ive lived in this city for a very long time, and it is a great and quiet place to live, with some nice shopping areas and great... Read More

    Start Your Review of Fullerton

    Fullerton: Good food, good music but bad roads. - 7/1/2019
    I have been living and working in Fullerton for almost 20 years now and have seen it change through the years, both for the better and worse. Fullerton is a half... Read More
    David |  | Reply | No Replies

    Beautiful! - 3/2/2016
    The weather here is gorgeous! Warm and rarely rains.... Read More

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