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United States › Michigan › St. Clair County › Climate Station RICHMOND 4 NNW, MI US Distance 7.3 mi Normals 1991–2020

30-year climate normals

St. Clair County Climate and Weather Averages

Hottest month — July

83.0°

average daily high. The coldest month is February, averaging a low of 16.1°F.

St. Clair County gets 35.9" of precipitation a year and 46.6" of snow, and 32% of it falls in May, Jun, Jul.

Temperature through the year

Each bar spans the average daily low to the average daily high for that month.

20° 40° 60° 80° JanFebMarAprMayJunJulAugSepOctNovDec
MonthAvg highAvg low PrecipSnow
January 30.1° 16.2° 2.37" 10.8"
February 32.8° 16.1° 1.92" 13.3"
March 42.1° 24.9° 2.09" 6.1"
April 56.2° 35.5° 3.19" 2.6"
May 68.5° 47.4° 3.81" 0.0"
June 78.4° 57.6° 3.56" 0.0"
July 83.0° 62.1° 3.94" 0.0"
August 80.0° 59.4° 3.27" 0.0"
September 73.1° 51.9° 3.46" 0.0"
October 60.3° 41.1° 2.95" 0.0"
November 46.5° 31.7° 2.97" 3.5"
December 35.4° 23.1° 2.37" 10.3"

Rainfall by month

Precipitation is spread fairly evenly through the year here, with 32% falling in the wettest three months (May, Jun, Jul).

January 2.37"
February 1.92"
March 2.09"
April 3.19"
May 3.81"
June 3.56"
July 3.94"
August 3.27"
September 3.46"
October 2.95"
November 2.97"
December 2.37"
Annual total 35.9"

What this climate costs you

Degree days measure how hard a building has to work to stay comfortable. They are the reason two identical houses have very different power bills, and they are the link between the weather here and what you pay every month.

Cooling degree days How much air conditioning the climate demands 649
Heating degree days How much heating the climate demands 6,785
Approximate annual cooling cost At 22.01¢/kWh, Michigan average $143
Approximate annual electric heating cost Lower where heating is gas rather than electric $523

These are rough planning figures from degree days and the state electricity price, not a bill estimate. House size, insulation and fuel type move them a lot. See the full cost of owning a home in St. Clair County, where electricity is one line of eight.

Common questions

What is the weather like in St. Clair County?

St. Clair County averages a high of 83.0°F in July and a low of 16.1°F in February. Annual precipitation is 35.9 inches, including 46.6 inches of snow.

When is the rainy season in St. Clair County?

The wettest stretch is May, Jun, Jul, which accounts for 32% of the year's precipitation. Precipitation is relatively evenly distributed across the year.

How hot does it get in St. Clair County?

The average daily high in July, the hottest month, is 83.0°F. That drives 649 cooling degree days a year, which is what your air conditioning has to work against.

Does it snow in St. Clair County?

Yes. St. Clair County averages 46.6 inches of snow a year.

Sources

  • Temperature, precipitation and snowfall normals — NOAA National Centers for Environmental Information, 1991–2020 Monthly Climate Normals, station RICHMOND 4 NNW, MI US (USC00206982), 7.3 miles from the county centroid.
  • Heating and cooling degree days — NOAA, same station and period.
  • Electricity price — US Energy Information Administration, Electric Power Monthly Table 5.6.A, Michigan residential average.
  • Wet-season share is the wettest three consecutive months as a percentage of annual precipitation, calculated from the monthly normals.