TODAY AUG14
TEMPERATURE71
HUMIDITY87
PRESSURE30.01
WIND COND.130 5.4
  • 8366Fri
  • 8565Sat
  • 8160Sun
  • 8057Mon
  • 7755Tue
daynightWeather update from Mattoon / Charleston, Coles County Memorial Airport at

Key findings

  • The highest monthly average temperature in Westfield for July is 75 degrees
  • The lowest monthly average temperature in Westfield for January is 28 degrees
  • The most monthly precipitation in Westfield occurs in April with 4.9 inches
  • The air quality index in Westfield is 10% better than the national average
  • The pollution index in Westfield is 67% better than the national average

Compare Westfield, IL Weather

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      Westfield 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°F37°F28°F1.5"
      February22°F39°F30°F1.7"
      March35°F54°F44°F2.1"
      April45°F66°F55°F4.9"
      May55°F75°F64°F3.8"
      June64°F84°F74°F4.7"
      July66°F86°F75°F4.2"
      August64°F85°F74°F2.1"
      September57°F79°F67°F3.0"
      October46°F67°F56°F2.9"
      November35°F53°F44°F2.4"
      December27°F41°F33°F2.4"

      Westfield 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.
      IndexWestfieldIllinoisNational
      Air quality index454150
      Pollution index1,664,3703,347,2955,066,862

      Westfield air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality237
      Days with moderate air quality127
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality0

      Westfield air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.040%
      Carbon Tetrachloride0.000%
      Lead0.030%
      Mercury0.003%

      Average monthly Westfield temperature with heat index

      Westfield monthly precipitation with daily maximum

      Westfield monthly snow depth with daily maximum

      Westfield monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Casey, IL2,5614020%
      Charleston, IL21,2574020%
      Greenup, IL1,7384020%
      Toledo, IL1,3724020%
      Oakland, IL8984216%
      Westfield, IL7424510%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Picture Rocks, PA7423530%
      Oppelo, AR7424510%
      Hauser, ID7424314%
      Eastborough, KS7424020%
      Middletown, MI7423824%
      Westfield, IL7424510%
      Source: The Westfield, 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.