Johnston City, IL Weather - Forecast & Monthly Averages

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Weather Quick Facts

The highest monthly average temperature in Johnston City for July is 78.6 degrees
The lowest monthly average temperature in Johnston City for January is 34.8 degrees
The most monthly precipitation in Johnston City occurs in June with 13.3 inches
The air quality index in Johnston City is 2% worse than the national average
The pollution index in Johnston City is 95% better than the national average

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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.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	27°F	44°F	35°F	2.5"
February	29°F	46°F	37°F	1.6"
March	40°F	59°F	49°F	4.1"
April	50°F	70°F	59°F	10.7"
May	58°F	78°F	68°F	10.5"
June	67°F	87°F	77°F	13.3"
July	70°F	88°F	79°F	0.5"
August	68°F	88°F	77°F	0.4"
September	61°F	81°F	70°F	1.2"
October	50°F	70°F	59°F	0.8"
November	39°F	58°F	48°F	5.8"
December	32°F	47°F	39°F	1.2"

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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.
Index	Johnston City	Illinois	National
Air quality index	43	41	42
Pollution index	125,359	3,148,694	2,726,193

Johnston City air quality

Measurement	Total
Days measured	344
Days with good air quality	269
Days with moderate air quality	74
Days w/ poor A.Q. for sensitive groups	1
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.000%
Benzene	0.003%
Carbon Tetrachloride	0.000%
Lead	0.000%
Mercury	0.000%

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	Population	Air Quality Index	National Avg.
Christopher, IL	2,601	43	14.0%
Royalton, IL	1,107	43	14.0%
Cambria, IL	1,071	43	14.0%
Energy, IL	1,208	43	14.0%
Whiteash, IL	83	43	14.0%
Johnston City, IL	3,414	43	14.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Day Valley, CA	3,414	35	30.0%
West Liberty, KY	3,414	42	16.0%
Hanover, MN	3,414	46	8.0%
New Hampton, IA	3,413	39	22.0%
Maiden, NC	3,413	36	28.0%
Johnston City, IL	3,414	43	14.0%

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.