St. Clair, MO Climate


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United States / Missouri / St. Louis Metro Area / Franklin County / St. Clair / Zip Codes
St. Clair, MO is known for its humid continental climate with hot summers and cold winters. Average temperatures range from highs of 86°F in the summer months to lows of 24°F during the winter season. Precipitation is fairly evenly distributed throughout the year, with an average annual rainfall of about 40 inches. Snowfall is also common in St. Clair, usually accumulating between 12 and 14 inches throughout the winter months. The area is known for having mild humidity levels all year round, meaning that the area’s climate is comfortable most of the time.

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

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

On average, there are 201 sunny days per year in St. Clair. The US average is 205 sunny days.

St. Clair gets some kind of precipitation, on average, 99 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 20
Rain: averages 44 inches of rain a year
Snow: averages 13 inches of snow a year

Bestplaces Comfort Index

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

7.6 Summer - 5.7 Winter
September, May and June are the most pleasant months in St. Clair, while January and December are the least comfortable months.

  ClimateSt. Clair, MissouriUnited States
  44.2 in.38.1 in.
  13.3 in.27.8 in.
  98.6 days106.2 days
  201 days205 days
  89.0°85.8°
  19.9°21.7°
  7.27
  4.14.3
  774 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 with an average high temperature of 89.0°, which ranks it as warmer than most places in Missouri. In St. Clair, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Clair are May, September and June.
In St. Clair, there are 38.0 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 with an average of 19.9°. This is about average compared to other places in Missouri.
In St. Clair, there are 115.2 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Missouri.
In St. Clair, there are 4.3 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Missouri.
The humidity can be uncomfortably heavy or close in St. Clair 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.
May is the wettest month in St. Clair with 5.0 inches of rain, and the driest month is February with 2.5 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 44.2 inches in St. Clair means that it is wetter than most places in Missouri.
May is the rainiest month in St. Clair with 10.8 days of rain, and February is the driest month with only 6.7 rainy days. There are 98.6 rainy days annually in St. Clair, which is about average compared to other places in Missouri. The rainiest season is Summer when it rains 31% of the time and the driest is Spring with only a 21% chance of a rainy day.
An annual snowfall of 13.3 inches in St. Clair means that it is about average compared to other places in Missouri. December is the snowiest month in St. Clair with 3.8 inches of snow, and 4 months of the year have significant snowfall.
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