TODAY AUG14
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.
  • 8068Wed70%70%
  • 8667Thu20%20%
  • 8767Fri20%50%
  • 8666Sat20%20%
  • 8668Sun30%
daynightWeather update from Washington Regional Airport at

St. Clair Average Weather

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
January23°F44°F32°F2.1"
February25°F46°F35°F1.8"
March36°F60°F47°F3.7"
April46°F71°F58°F5.3"
May55°F78°F66°F4.5"
June65°F87°F76°F4.8"
July68°F90°F79°F2.9"
August66°F89°F77°F3.4"
September58°F82°F69°F3.9"
October46°F70°F57°F3.0"
November36°F59°F46°F2.8"
December27°F45°F35°F3.1"

Did you know?

  • The highest monthly average temperature in St. Clair for July is 79 degrees.
  • The lowest monthly average temperature in St. Clair for January is 32 degrees.
  • The most monthly precipitation in St. Clair occurs in April with 5.3 inches.
  • The air quality index in St. Clair is 20% worse than the national average.
  • The pollution index in St. Clair is 39% better than the national average.

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Compare St. Clair, MO Weather To Other Cities

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. ClairMissouriNational
Air quality index609750
Pollution index3,042,5302,360,5665,066,862

St. Clair air quality information

MeasurementTotal
Days measured365
Days with good air quality99
Days with moderate air quality231
Days w/ poor A.Q. for sensitive groups33
Days with unhealthy air quality2

St. Clair air quality information

PollutantTotal
Arsenic0.010%
Benzene0.040%
Carbon Tetrachloride0.010%
Lead0.010%
Mercury0.001%

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

City, StatePopulationAir Quality IndexNational Avg.
Bourbon, MO1,7003726%
Leslie, MO1123726%
St. Cloud, MO913726%
West Sullivan, MO713726%
Parkway, MO3746020%
St. Clair, MO4,7056020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Kittery, ME4,7043628%
Breckenridge Hills, MO4,7076020%
Goodland, KS4,702688%
Moon Lake, FL4,7084314%
Franklin Center, NJ4,7014020%
St. Clair, MO4,7056020%
Source: The St. Clair, MO 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.