St. Clair County, MO Climate

St. Clair, MO County has a humid continental climate with hot and humid summers and cold winters. The average high temperature in summer is around 82°F and the average low temperature in winter is around 24°F. Precipitation levels tend to be moderate throughout the year, although spring and fall tend to be slightly wetter than the summer and winter months. Snowfall averages around 10 inches annually, making it an ideal region for outdoor activities such as skiing and snowshoeing.

St. Clair County, Missouri gets 44 inches of rain, on average, per year. The US average is 38 inches of rain per year.

St. Clair County averages 11 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 212 sunny days per year in St. Clair County. The US average is 205 sunny days.

St. Clair County gets some kind of precipitation, on average, 90 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 44 inches of rain a year
Snow: averages 11 inches of snow a year

Bestplaces Comfort Index

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

7.4 Summer - 5.8 Winter

September, May and October are the most pleasant months in St. Clair County, while January and December are the least comfortable months.

Climate	St. Clair, Missouri	United States
	44.3 in.	38.1 in.
	10.9 in.	27.8 in.
	90.3 days	106.2 days
	212 days	205 days
	89.4°	85.8°
	20.5°	21.7°
	7.2	7
	4.4	4.3
	817 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. Clair County with an average high temperature of 89.4°, which ranks it as warmer than most places in Missouri. In St. Clair County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Clair County are May, September and June.

In St. Clair County, there are 38.3 days annually when the high temperature is over 90°, which is hotter than most places in Missouri.

January has the coldest nighttime temperatures for St. Clair County with an average of 20.5°. This is about average compared to other places in Missouri.

In St. Clair County, there are 104.9 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Missouri.

In St. Clair County, there are 3.1 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. Clair County 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. Clair County.

May is the wettest month in St. Clair County with 5.6 inches of rain, and the driest month is January with 1.7 inches. The wettest season is Autumn with 30% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 44.3 inches in St. Clair County means that it is wetter than most places in Missouri.

May is the rainiest month in St. Clair County with 10.7 days of rain, and January is the driest month with only 5.5 rainy days. There are 90.3 rainy days annually in St. Clair County, which is less rainy 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 19% chance of a rainy day.

An annual snowfall of 10.9 inches in St. Clair County means that it is less snowy than most places in Missouri. January is the snowiest month in St. Clair County with 4.0 inches of snow, and 4 months of the year have significant snowfall.

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