Chesterfield, MO 

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Climate in Chesterfield, MO

The climate in Chesterfield, Missouri is typically warm and humid throughout the year. Summers are hot with temperatures occasionally reaching into the upper 90s and low 100s while winters are mild with temperatures generally ranging from 30 to 50 degrees Fahrenheit. Rainfall is evenly spread out over the year, making for plenty of wet days throughout the year. The area also experiences occasional thunderstorms and tornadoes during the spring and summer months.

Chesterfield, Missouri gets 43 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Chesterfield averages 13 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 202 sunny days per year in Chesterfield. The US average is 205 sunny days.

Chesterfield gets some kind of precipitation, on average, 103 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 21
Rain: averages 43 inches of rain a year
Snow: averages 13 inches of snow a year


The annual BestPlaces Comfort Index for Chesterfield is 7.2 (10=best), which means it is more comfortable than most places in Missouri.

7.6 / 5.7

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

Climate Averages
  Chesterfield, MissouriUnited States
  42.7 in.38.1 in.
  12.8 in.27.8 in.
  102.5 days106.2 days
  202 days205 days
  472 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.

July is the hottest month for Chesterfield with an average high temperature of 88.7°, which ranks it as warmer than most places in Missouri. In Chesterfield, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Chesterfield are May, September and June.

In Chesterfield, there are 36.2 days annually when the high temperature is over 90°, which is hotter than most places in Missouri.

January has the coldest nighttime temperatures for Chesterfield with an average of 21.1°. This is about average compared to other places in Missouri.

In Chesterfield, there are 102.3 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Missouri.

In Chesterfield, there are 2.7 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Missouri.

The humidity can be uncomfortably heavy or close in Chesterfield during the summer months. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most humid months in Chesterfield.

May is the wettest month in Chesterfield with 5.0 inches of rain, and the driest month is January with 2.3 inches. The wettest season is Summer with 29% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 42.7 inches in Chesterfield means that it is drier than most places in Missouri.

May is the rainiest month in Chesterfield with 11.2 days of rain, and January is the driest month with only 6.7 rainy days. There are 102.5 rainy days annually in Chesterfield, which is rainier than most places in Missouri. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 22% chance of a rainy day.

An annual snowfall of 12.8 inches in Chesterfield means that it is about average compared to other places in Missouri. January is the snowiest month in Chesterfield with 3.9 inches of snow, and 5 months of the year have significant snowfall.

  • Annual Rainfall (US Avg: 36.5")
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    Reviews for Chesterfield    7 Reviews
    Look elsewhere if you can help it - 6/27/2021
    I've lived in St. Louis for roughly ten years and I grew up in the surrounding area. I do not recommend St. Louis to live for two reasons: crime and the weather. A lot... Read More

    Start Your Review of Chesterfield

    No Wind - 10/5/2008
    The climate in Chesterfield is moderate winters, hot humid summers. The best season is spring and the worst season is winter. The worst problem with the climate in... Read More

    underestimated - 3/16/2008
    The good things about Chesterfield are relatively inexpensive cost combined with many things to do in the area and proximity to an airport. Unlike many areas growing... Read More

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