TODAY MAY16
TEMPERATURE66
HUMIDITY64
PRESSURE30.17
WIND COND. 9.4
  • 7160Mon60%70%
  • 7562Tue50%40%
  • 8165Wed20%30%
  • 8265Thu30%30%
  • 8365Fri30%30%
daynightWeather update from St. Louis Regional Airport at

Key findings

  • The highest monthly average temperature in Gillespie for July is 75.9 degrees
  • The lowest monthly average temperature in Gillespie for January is 29.4 degrees
  • The most monthly precipitation in Gillespie occurs in April with 9.3 inches
  • The air quality index in Gillespie is 9% worse than the national average
  • The pollution index in Gillespie is 77% better than the national average

Compare Gillespie, IL Weather

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      Gillespie 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°F38°F29°F3.3"
      February24°F40°F31°F3.5"
      March36°F55°F44°F3.9"
      April45°F67°F55°F9.3"
      May55°F75°F64°F5.6"
      June64°F84°F73°F7.9"
      July66°F86°F76°F5.0"
      August65°F86°F74°F5.1"
      September57°F80°F67°F6.0"
      October46°F68°F56°F5.6"
      November36°F54°F44°F3.6"
      December28°F42°F34°F3.6"

      Gillespie 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.
      IndexGillespieIllinoisNational
      Air quality index544150
      Pollution index1,150,6703,347,2955,066,862

      Gillespie air quality information

      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

      Gillespie air quality information

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

      Average monthly Gillespie temperature with heat index

      Gillespie monthly precipitation with daily maximum

      Gillespie monthly snow depth with daily maximum

      Gillespie monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Raymond, IL8674020%
      Carlinville, IL5,2974020%
      Litchfield, IL6,9764020%
      Chesterfield, IL3364020%
      Royal Lakes, IL134548%
      Gillespie, IL3,323548%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Middleville, MI3,3243824%
      Avon, NY3,3243726%
      Midland, NC3,322492%
      South Beach, FL3,3253628%
      Wynantskill, NY3,3213726%
      Gillespie, IL3,323548%
      Source: The Gillespie, 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.