St. Clair County, MI Climate

St. Clair, MI County has four distinct seasons with mild summers and cold winters. The average high temperature in the summer is typically in the mid-seventies (°F) while the winter months bring temperatures in the twenties or lower (°F). The area receives an average of three feet of snowfall each year, though it can often exceed this amount. The county also receives an average of 37 inches of rain annually. Overall, St. Clair County experiences a mild climate with warm summers and cold winters.

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

St. Clair County averages 35 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 177 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, 125 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 16
Rain: averages 34 inches of rain a year
Snow: averages 35 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for St. Clair County is 6.7 (10=best), which means it is more comfortable than most places in Michigan.

9.3 Summer - 4.3 Winter

August, July and June are the most pleasant months in St. Clair County, while January and February are the least comfortable months.

Climate	St. Clair, Michigan	United States
	33.5 in.	38.1 in.
	35.3 in.	27.8 in.
	125.1 days	106.2 days
	177 days	205 days
	81.7°	85.8°
	15.8°	21.7°
	6.7	7
	3.5	4.3
	695 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 81.7°, which ranks it as about average compared to other places in Michigan. In St. Clair County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Clair County are June, August and July.

In St. Clair County, there are 5.9 days annually when the high temperature is over 90°, which is about average compared to other places in Michigan.

January has the coldest nighttime temperatures for St. Clair County with an average of 15.8°. This is about average compared to other places in Michigan.

In St. Clair County, there are 140.5 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Michigan.

In St. Clair County, there are 5.0 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Michigan.

Humidity in St. Clair County 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 County with 3.8 inches of rain, and the driest month is February with 1.8 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 33.5 inches in St. Clair County means that it is about average compared to other places in Michigan.

December is the rainiest month in St. Clair County with 11.8 days of rain, and February is the driest month with only 9.1 rainy days. There are 125.1 rainy days annually in St. Clair County, which is less rainy than most places in Michigan. The rainiest season is Spring when it rains 26% of the time and the driest is Autumn with only a 23% chance of a rainy day.

An annual snowfall of 35.3 inches in St. Clair County means that it is less snowy than most places in Michigan. January is the snowiest month in St. Clair County with 10.6 inches of snow, and 6 months of the year have significant snowfall.

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