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Johnston City 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
January27°F44°F35°F2.5"
February29°F46°F37°F1.6"
March40°F59°F49°F4.1"
April50°F70°F59°F10.7"
May58°F78°F68°F10.5"
June67°F87°F77°F13.3"
July70°F88°F79°F0.5"
August68°F88°F77°F0.4"
September61°F81°F70°F1.2"
October50°F70°F59°F0.8"
November39°F58°F48°F5.8"
December32°F47°F39°F1.2"

Did you know?

  • The highest monthly average temperature in Johnston City for July is 79 degrees.
  • The lowest monthly average temperature in Johnston City for January is 35 degrees.
  • The most monthly precipitation in Johnston City occurs in June with 13.3 inches.
  • The air quality index in Johnston City is 21% better than the national average.
  • The pollution index in Johnston City is 97% better than the national average.

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Johnston City 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.
IndexJohnston CityIllinoisNational
Air quality index394150
Pollution index125,3593,347,2955,066,862

Johnston City air quality information

MeasurementTotal
Days measured243
Days with good air quality204
Days with moderate air quality39
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Johnston City air quality information

PollutantTotal
Arsenic0.000%
Benzene0.003%
Carbon Tetrachloride0.000%
Lead0.000%
Mercury0.000%

Average monthly Johnston City temperature with heat index

Johnston City monthly precipitation with daily maximum

Johnston City monthly snow depth with daily maximum

Johnston City monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Creal Springs, IL3893628%
Stonefort, IL4203628%
Benton, IL7,1483922%
Carterville, IL5,7423922%
Crainville, IL1,4563922%
Johnston City, IL3,5213922%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Gothenburg, NE3,5211962%
Pawhuska, OK3,5214412%
Baldwin, GA3,5234216%
Smithville-Sanders, IN3,5194020%
Bloomer, WI3,523355610%
Johnston City, IL3,5213922%
Source: The Johnston City, 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.