TODAY NOV06
TEMPERATURE54
HUMIDITY97
PRESSURE101220
WIND COND.250 9.4
  • 5643Wed
  • 5637Thu
  • 6041Fri
  • 6048Sat60%70%
  • 6242Sun
daynightWeather update from Jacksonville Municipal Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Winchester for July is 76.2 degrees
  • The lowest monthly average temperature in Winchester for January is 29 degrees
  • The most monthly precipitation in Winchester occurs in June with 8 inches
  • The air quality index in Winchester is 5% better than the national average
  • The pollution index in Winchester is 58% better than the national average

Compare Winchester, IL 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
      January21°F39°F29°F3.2"
      February22°F41°F31°F2.9"
      March35°F56°F44°F3.7"
      April44°F68°F55°F6.8"
      May55°F76°F65°F5.2"
      June64°F85°F74°F8.0"
      July66°F87°F76°F5.2"
      August64°F85°F74°F6.3"
      September57°F80°F68°F6.6"
      October46°F68°F56°F3.3"
      November36°F55°F45°F5.0"
      December26°F41°F33°F5.3"

      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.
      IndexWinchesterIllinoisNational
      Air quality index404142
      Pollution index1,150,6703,148,6942,726,193

      Winchester air quality

      MeasurementTotal
      Days measured360
      Days with good air quality287
      Days with moderate air quality73
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.001%
      Benzene0.030%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      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.
      White Hall, IL2,3564020.0%
      Jacksonville, IL18,7844020.0%
      Manchester, IL2204020.0%
      Exeter, IL724020.0%
      Lynnville, IL1274020.0%
      Winchester, IL1,7174020.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Shirley, MA1,7164020.0%
      North Berwick, ME1,7164020.0%
      Hatch, NM1,718512.0%
      Panguitch, UT1,7184412.0%
      Wicklow, NB1,716n/a 
      Winchester, IL1,7174020.0%
      Source: The Winchester, IL 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.