TODAY MAY18
TEMPERATURE61
HUMIDITY100
PRESSURE30.1
WIND COND.140 20.5
  • 7764Wed40%40%
  • 8365Thu30%
  • 8365Fri
  • 8465Sat
  • 8766Sun
daynightWeather update from Macomb Municipal Airport at

Key findings

  • The highest monthly average temperature in Lewistown for July is 74.7 degrees
  • The lowest monthly average temperature in Lewistown for January is 25.9 degrees
  • The most monthly precipitation in Lewistown occurs in June with 10.8 inches
  • The air quality index in Lewistown is 18% better than the national average
  • The pollution index in Lewistown is 80% better than the national average

Compare Lewistown, IL Weather

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      Lewistown 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°F35°F26°F3.6"
      February19°F38°F27°F3.0"
      March33°F53°F42°F3.4"
      April43°F67°F54°F5.4"
      May53°F76°F64°F7.4"
      June63°F84°F73°F10.8"
      July65°F85°F75°F8.6"
      August63°F84°F73°F8.8"
      September55°F80°F66°F8.0"
      October44°F68°F55°F8.3"
      November33°F54°F42°F6.4"
      December23°F38°F30°F5.1"

      Lewistown 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.
      IndexLewistownIllinoisNational
      Air quality index414150
      Pollution index1,001,7103,347,2955,066,862

      Lewistown 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

      Lewistown air quality information

      PollutantTotal
      Arsenic0.004%
      Benzene0.040%
      Carbon Tetrachloride0.000%
      Lead0.010%
      Mercury0.020%

      Average monthly Lewistown temperature with heat index

      Lewistown monthly precipitation with daily maximum

      Lewistown monthly snow depth with daily maximum

      Lewistown monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Astoria, IL1,0654020%
      Bath, IL2574020%
      Havana, IL3,2514118%
      Smithfield, IL1724118%
      Table Grove, IL4364118%
      Lewistown, IL2,3854118%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      New Hope, PA2,3854118%
      Tangelo Park, FL2,3863922%
      Arial, SC2,384468%
      Van Vleck, TX2,387524%
      Seneca, MO2,3873824%
      Lewistown, IL2,3854118%
      Source: The Lewistown, 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.