TODAY AUG14
TEMPERATURE73
HUMIDITY95
PRESSURE30.03
WIND COND.150 4.7
  • 8470Wed60%60%
  • 8670Thu50%20%
  • 8869Fri60%
  • 8670Sat40%20%
  • 8670Sun20%20%
daynightWeather update from Sparta Community-Hunter Field Airport at

St. Mary 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
January25°F42°F33°F4.6"
February27°F45°F35°F2.4"
March39°F58°F48°F3.7"
April48°F69°F58°F6.6"
May57°F77°F66°F10.0"
June66°F86°F76°F8.8"
July69°F88°F78°F6.8"
August67°F87°F76°F10.7"
September59°F81°F69°F7.4"
October48°F70°F58°F9.0"
November38°F57°F47°F6.5"
December30°F45°F37°F7.7"

Did you know?

  • The highest monthly average temperature in St. Mary for July is 78 degrees.
  • The lowest monthly average temperature in St. Mary for January is 33 degrees.
  • The most monthly precipitation in St. Mary occurs in August with 10.7 inches.
  • The air quality index in St. Mary is 20% worse than the national average.
  • The pollution index in St. Mary is 85% better than the national average.

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Compare St. Mary, MO Weather To Other Cities

St. Mary 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. MaryMissouriNational
Air quality index609750
Pollution index753,4732,360,5665,066,862

St. Mary 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. Mary air quality information

PollutantTotal
Arsenic0.001%
Benzene0.010%
Carbon Tetrachloride0.001%
Lead0.020%
Mercury0.020%

Average monthly St. Mary temperature with heat index

St. Mary monthly precipitation with daily maximum

St. Mary monthly snow depth with daily maximum

St. Mary monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Rockwood, IL313922%
Longtown, MO1413922%
Kaskaskia, IL206020%
Brewer, MO3996020%
Perryville, MO8,3746020%
St. Mary, MO4846020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Sale City, GA4844314%
Lilesville, NC4844216%
Union, IL4843138%
Withee, WI484355610%
Corbin City, NJ4843138%
St. Mary, MO4846020%
Source: The St. Mary, 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.