TODAY MAY12
TEMPERATURE45
HUMIDITY70
PRESSURE30.41
WIND COND.30 11.2
  • 6742Thu
  • 7050Fri
  • 7156Sat30%
  • 7760Sun30%30%
  • 7659Mon60%60%
daynightWeather update from Sparta Community-Hunter Field Airport at

Key findings

  • The highest monthly average temperature in Prairie du Rocher for July is 78 degrees
  • The lowest monthly average temperature in Prairie du Rocher for January is 32.9 degrees
  • The most monthly precipitation in Prairie du Rocher occurs in August with 10.7 inches
  • The air quality index in Prairie du Rocher is 9% worse than the national average
  • The pollution index in Prairie du Rocher is 85% better than the national average

Compare Prairie du Rocher, IL Weather

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      Prairie du Rocher 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
      January25°F42°F33°F4.6"
      February27°F45°F35°F2.4"
      March39°F58°F48°F3.7"
      April48°F69°F58°F6.6"
      May57°F77°F66°F10.0"
      June66°F86°F76°F8.8"
      July69°F88°F78°F6.8"
      August67°F87°F76°F10.7"
      September59°F81°F69°F7.4"
      October48°F70°F58°F9.0"
      November38°F57°F47°F6.5"
      December30°F45°F37°F7.7"

      Prairie du Rocher 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.
      IndexPrairie du RocherIllinoisNational
      Air quality index544150
      Pollution index753,4733,347,2955,066,862

      Prairie du Rocher 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

      Prairie du Rocher air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.010%
      Carbon Tetrachloride0.001%
      Lead0.020%
      Mercury0.020%

      Average monthly Prairie du Rocher temperature with heat index

      Prairie du Rocher monthly precipitation with daily maximum

      Prairie du Rocher monthly snow depth with daily maximum

      Prairie du Rocher monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      St. Mary, MO484548%
      Ellis Grove, IL353548%
      Maeystown, IL138548%
      Bloomsdale, MO568548%
      Weingarten, MO80548%
      Prairie du Rocher, IL622548%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Arlee, MT6224020%
      Amelia Court House, VA6224412%
      Green Acres, ND6223628%
      Imboden, AR6222648%
      Old Green, OK6223628%
      Prairie du Rocher, IL622548%
      Source: The Prairie du Rocher, 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.