TODAY NOV07
TEMPERATURE59
HUMIDITY60
PRESSURE102540
WIND COND.40 13
  • 6144Fri
  • 6151Sat40%70%
  • 6645Sun
  • 6541
  • 6550Tue
daynightWeather update from St. Louis, Spirit Of St. Louis Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Winchester for July is 78.7 degrees
  • The lowest monthly average temperature in Winchester for January is 32.1 degrees
  • The most monthly precipitation in Winchester occurs in April with 5.3 inches
  • The air quality index in Winchester is 28% worse than the national average
  • The pollution index in Winchester is 225% worse than the national average

Compare Winchester, MO Weather

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      Winchester 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
      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"

      Winchester 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.
      IndexWinchesterMissouriNational
      Air quality index549742
      Pollution index8,870,2301,630,2552,726,193

      Winchester 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
      Arsenic0.180%
      Benzene0.060%
      Carbon Tetrachloride0.020%
      Lead0.030%
      Mercury0.120%

      Average monthly Winchester temperature with heat index

      Winchester monthly precipitation with daily maximum

      Winchester monthly snow depth with daily maximum

      Winchester monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Lake St. Louis, MO16,357548.0%
      Crystal Lake Park, MO440548.0%
      Ladue, MO8,631548.0%
      Oakland, MO1,538548.0%
      Westwood, MO314548.0%
      Winchester, MO1,751548.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Pagosa Springs, CO1,7514412.0%
      Lake City, IA1,7513726.0%
      Walker Valley, NY1,7513628.0%
      Elkland, PA1,7513530.0%
      Stewartstown, PA1,7514118.0%
      Winchester, MO1,751548.0%
      Source: The Winchester, 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.