TODAY NOV21
TEMPERATURE37
HUMIDITY56
PRESSURE101660
WIND COND.310 31.7
  • 4729Fri
  • 5238Sat
  • 6345Sun
  • 5327Mon20%
  • 4228Tue
daynightWeather update from St. Charles, St. Charles County Smartt Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Winfield for August is 79.4 degrees
  • The lowest monthly average temperature in Winfield for December is 31.7 degrees
  • The most monthly precipitation in Winfield occurs in January with 9 inches
  • The air quality index in Winfield is 28% worse than the national average
  • The pollution index in Winfield is 12% worse than the national average

Compare Winfield, MO Weather

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      Winfield 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
      January26°F41°F33°F9.0"
      February25°F43°F33°F4.8"
      March36°F60°F47°F3.9"
      April44°F68°F55°F4.3"
      May56°F80°F67°F4.3"
      June65°F87°F76°F5.8"
      July66°F89°F77°F3.9"
      August69°F91°F79°F4.6"
      September60°F85°F71°F4.9"
      October48°F71°F59°F3.7"
      November36°F58°F46°F7.6"
      December25°F40°F32°F2.5"

      Winfield 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.
      IndexWinfieldMissouriNational
      Air quality index549742
      Pollution index3,042,5301,630,2552,726,193

      Winfield air quality

      MeasurementTotal
      Days measured365
      Days with good air quality134
      Days with moderate air quality221
      Days w/ poor A.Q. for sensitive groups8
      Days with unhealthy air quality2

      Air quality details

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

      Average monthly Winfield temperature with heat index

      Winfield monthly precipitation with daily maximum

      Winfield monthly snow depth with daily maximum

      Winfield monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Whiteside, MO854118.0%
      Fountain N' Lakes, MO232548.0%
      Foristell, MO881548.0%
      O'Fallon, MO88,132548.0%
      St. Paul, MO2,463548.0%
      Winfield, MO1,954548.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Huachuca City, AZ1,9544510.0%
      Arcade, GA1,9544412.0%
      Weedsport, NY1,9543726.0%
      Gila Bend, AZ1,9557448.0%
      Slayton, MN1,9533236.0%
      Winfield, MO1,954548.0%
      Source: The Winfield, 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.