St. Charles, MO Climate

St. Charles, MO has a humid continental climate with hot and humid summers and cold, snowy winters. During the summer months, temperatures average in the mid-80s Fahrenheit (29-30°C) with high humidity levels that can make it seem much hotter than it actually is. In winter, temperatures range from just above freezing to as low as 10 degrees Fahrenheit (-11°C). The city also experiences snowfall throughout the winter season, with an average of 17 inches (43cm) of snow per year.

St. Charles, Missouri gets 42 inches of rain, on average, per year. The US average is 38 inches of rain per year.

St. Charles averages 14 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 St. Charles. The US average is 205 sunny days.

St. Charles gets some kind of precipitation, on average, 106 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 88 degrees
Winter Low: the January low is 21
Rain: averages 42 inches of rain a year
Snow: averages 14 inches of snow a year

Bestplaces Comfort Index

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

7.6 Summer - 5.6 Winter

September, May and June are the most pleasant months in St. Charles, while January and December are the least comfortable months.

Climate	St. Charles, Missouri	United States
	42.2 in.	38.1 in.
	14.2 in.	27.8 in.
	105.9 days	106.2 days
	202 days	205 days
	88.3°	85.8°
	21.3°	21.7°
	7.2	7
	4.4	4.3
	492 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. Charles with an average high temperature of 88.3°, which ranks it as about average compared to other places in Missouri. In St. Charles, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Charles are September, May and June.

In St. Charles, there are 33.5 days annually when the high temperature is over 90°, which is about average compared to other places in Missouri.

January has the coldest nighttime temperatures for St. Charles with an average of 21.3°. This is warmer than most places in Missouri.

In St. Charles, there are 100.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Missouri.

In St. Charles, 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 St. Charles 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 St. Charles.

May is the wettest month in St. Charles with 4.9 inches of rain, and the driest month is January with 2.4 inches. The wettest season is Summer with 29% of yearly precipitation and 19% occurs in Spring, which is the driest season. The annual rainfall of 42.2 inches in St. Charles means that it is drier than most places in Missouri.

May is the rainiest month in St. Charles with 11.5 days of rain, and September is the driest month with only 7.3 rainy days. There are 105.9 rainy days annually in St. Charles, which is one of the rainiest 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 14.2 inches in St. Charles means that it is snowier than most places in Missouri. January is the snowiest month in St. Charles with 4.4 inches of snow, and 5 months of the year have significant snowfall.

Reviews for St. Charles

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Bryan · Saint Charles, MO

Great town to grow up in

Over 6 years ago

I grew up here and I loved everything about the county. There are thousands of little trails all over the place, so when I was a child we would always go running around More

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Darlene · Saint Charles, MO

Missouri

Over 9 years ago

It is way too hot & humid here in the summer. Winters are great, except for a lack of More

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Eric · St. Charles, MO

St. Charles, Missouri. Good family place.

Over 14 years ago

Good growth, decent economics, below average politics. School system above More

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