St. Clair, MI Climate


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United States / Michigan / Detroit-Warren-Dearborn Metro Area / St. Clair County / St. Clair / Zip Codes
St. Clair, MI enjoys a moderate continental climate with humid summers and cold winters. The average temperature range throughout the year is between 35-55 degrees Fahrenheit. In the summer months, temperatures can climb to around 80 degrees with high humidity and frequent thunderstorms. Winters in St. Clair typically reach temperatures of around 20-30 degrees Fahrenheit, often accompanied by lake effect snow showers which bring an additional accumulation of snowfall each season.

St. Clair, Michigan gets 34 inches of rain, on average, per year. The US average is 38 inches of rain per year.

St. Clair averages 36 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 174 sunny days per year in St. Clair. The US average is 205 sunny days.

St. Clair gets some kind of precipitation, on average, 129 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 82 degrees
Winter Low: the January low is 17
Rain: averages 34 inches of rain a year
Snow: averages 36 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for St. Clair is 6.8 (10=best), which means it is one of the most pleasant places in Michigan.

9.4 Summer - 4.3 Winter
August, July and June are the most pleasant months in St. Clair, while January and February are the least comfortable months.

  ClimateSt. Clair, MichiganUnited States
  34.1 in.38.1 in.
  36.1 in.27.8 in.
  129.2 days106.2 days
  174 days205 days
  82.0°85.8°
  16.8°21.7°
  6.87
  3.54.3
  587 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 82.0°, which ranks it as about average compared to other places in Michigan. In St. Clair, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Clair are June, August and July.
In St. Clair, there are 6.9 days annually when the high temperature is over 90°, which is hotter than most places in Michigan.
January has the coldest nighttime temperatures for St. Clair with an average of 16.8°. This is warmer than most places in Michigan.
In St. Clair, there are 133.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Michigan.
In St. Clair, there are 4.4 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Michigan.
Humidity in St. Clair is generally low and comfortable. But there some days when the humidity becomes unpleasant, especially in July and August. The most humid months (but still comfortable) are July, August and June.
September is the wettest month in St. Clair with 3.9 inches of rain, and the driest month is January with 1.9 inches. The wettest season is Autumn with 29% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 34.1 inches in St. Clair means that it is wetter than most places in Michigan.
December is the rainiest month in St. Clair with 12.4 days of rain, and July is the driest month with only 9.5 rainy days. There are 129.2 rainy days annually in St. Clair, which is about average compared to other places in Michigan. The rainiest season is Spring when it rains 27% of the time and the driest is Autumn with only a 23% chance of a rainy day.
An annual snowfall of 36.1 inches in St. Clair means that it is less snowy than most places in Michigan. January is the snowiest month in St. Clair with 11.0 inches of snow, and 6 months of the year have significant snowfall.
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