TODAY MAY09
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.
  • 6137Mon
  • 6138Tue
  • 6541Wed
  • 6745Thu
  • 6851Fri
daynightWeather update from Marshall County Airport at

Key findings

  • The highest monthly average temperature in Chillicothe for July is 74.3 degrees
  • The lowest monthly average temperature in Chillicothe for January is 25.1 degrees
  • The most monthly precipitation in Chillicothe occurs in August with 8.3 inches
  • The air quality index in Chillicothe is 18% better than the national average
  • The pollution index in Chillicothe is 93% better than the national average

Compare Chillicothe, IL Weather

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      Chillicothe 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
      January18°F34°F25°F3.2"
      February19°F36°F27°F3.2"
      March32°F51°F41°F5.1"
      April42°F64°F52°F6.5"
      May53°F74°F63°F7.0"
      June62°F82°F72°F7.0"
      July65°F85°F74°F7.2"
      August64°F84°F73°F8.3"
      September57°F78°F66°F7.1"
      October45°F65°F54°F6.0"
      November34°F52°F42°F4.6"
      December23°F38°F30°F3.8"

      Chillicothe 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.
      IndexChillicotheIllinoisNational
      Air quality index414150
      Pollution index339,1563,347,2955,066,862

      Chillicothe air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality285
      Days with moderate air quality78
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Chillicothe air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.020%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Chillicothe temperature with heat index

      Chillicothe monthly precipitation with daily maximum

      Chillicothe monthly snow depth with daily maximum

      Chillicothe monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      La Rose, IL1124118%
      Varna, IL4784118%
      Peoria Heights, IL6,0194118%
      Eureka, IL5,8274118%
      Dunlap, IL1,3514118%
      Chillicothe, IL6,1694118%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Cold Spring, KY6,168548%
      Schuyler, NE6,1713138%
      Marble Falls, TX6,1674412%
      Holly, MI6,1713824%
      East Alton, IL6,171548%
      Chillicothe, IL6,1694118%
      Source: The Chillicothe, 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.