TODAY NOV09
TEMPERATURE52
HUMIDITY50
PRESSURE102740
WIND COND.140 9.4
  • 5846Sun100%60%
  • 5737
  • 4733Tue
  • 5343Wed
  • 5438Thu
daynightWeather update from St Clair County International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in St. Clair for July is 70.9 degrees
  • The lowest monthly average temperature in St. Clair for February is 24.1 degrees
  • The most monthly precipitation in St. Clair occurs in July with 4 inches
  • The air quality index in St. Clair is 33% worse than the national average
  • The pollution index in St. Clair is 1007% worse than the national average

Compare St. Clair, MI Weather

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      St. Clair Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January18°F32°F25°F3.5"
      February16°F32°F24°F2.2"
      March26°F43°F33°F2.2"
      April36°F57°F45°F2.8"
      May46°F69°F57°F3.2"
      June56°F77°F66°F3.6"
      July61°F81°F71°F4.0"
      August60°F80°F69°F3.3"
      September53°F74°F63°F3.1"
      October43°F62°F52°F2.5"
      November33°F49°F41°F2.9"
      December24°F37°F30°F3.0"

      St. Clair air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexSt. ClairMichiganNational
      Air quality index566942
      Pollution index30,180,3004,161,6062,726,193

      St. Clair air quality

      MeasurementTotal
      Days measured365
      Days with good air quality135
      Days with moderate air quality217
      Days w/ poor A.Q. for sensitive groups13
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.030%
      Benzene0.390%
      Carbon Tetrachloride0.080%
      Lead0.130%
      Mercury0.010%

      Average monthly St. Clair temperature with heat index

      St. Clair monthly precipitation with daily maximum

      St. Clair monthly snow depth with daily maximum

      St. Clair monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Marysville, MI9,6955612.0%
      New Baltimore, MI12,3335612.0%
      Memphis, MI1,0645612.0%
      Richmond, MI5,8515612.0%
      Port Huron, MI28,9185612.0%
      St. Clair, MI5,3545612.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Saint Marys, NB5,353n/a 
      Candlewick Lake, IL5,3514216.0%
      Tonganoxie, KS5,357476.0%
      Macon, MO5,3573824.0%
      Toronto, OH5,357468.0%
      St. Clair, MI5,3545612.0%
      Source: The St. Clair, MI weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.