TODAY FEB25
TEMPERATURE45
HUMIDITY45
PRESSURE30.36
WIND COND.60 9.4
  • 5236Fri30%
  • 5945Sat40%
  • 6028Sun
  • 4931Mon
  • 5035Tue30%
daynightWeather update from St. Louis Regional Airport at

Key findings

  • The highest monthly average temperature in Troy for July is 78 degrees
  • The lowest monthly average temperature in Troy for January is 32 degrees
  • The most monthly precipitation in Troy occurs in April with 10.2 inches
  • The air quality index in Troy is 9% worse than the national average
  • The pollution index in Troy is 20% worse than the national average

Compare Troy, IL Weather

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      Troy 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°F42°F32°F5.6"
      February25°F45°F34°F3.8"
      March37°F59°F47°F7.1"
      April47°F70°F57°F10.2"
      May56°F77°F66°F8.9"
      June65°F87°F76°F9.2"
      July68°F89°F78°F8.0"
      August66°F88°F76°F7.8"
      September58°F82°F69°F8.4"
      October47°F70°F57°F8.6"
      November36°F57°F46°F6.9"
      December28°F45°F36°F8.2"

      Troy 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.
      IndexTroyIllinoisNational
      Air quality index544150
      Pollution index6,055,6403,347,2955,066,862

      Troy 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

      Troy air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.070%
      Carbon Tetrachloride0.040%
      Lead0.100%
      Mercury0.230%

      Average monthly Troy temperature with heat index

      Troy monthly precipitation with daily maximum

      Troy monthly snow depth with daily maximum

      Troy monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Holiday Shores, IL2,785548%
      Bethalto, IL9,364548%
      Grantfork, IL360548%
      Marine, IL872548%
      Roxana, IL1,800548%
      Troy, IL10,041548%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Gages Lake, IL10,0413922%
      Bonham, TX10,040325550%
      Indianola, MS10,0474314%
      Waverly, IA10,0493922%
      Avon Park, FL10,0523628%
      Troy, IL10,041548%
      Source: The Troy, 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.