Charleston, IL Weather - Forecast & Monthly Averages

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TEMPERATURE	66
HUMIDITY	68
PRESSURE	101591.66
WIND COND.	130 13

Weather Quick Facts

The highest monthly average temperature in Charleston for July is 75.5 degrees
The lowest monthly average temperature in Charleston for January is 28.4 degrees
The most monthly precipitation in Charleston occurs in April with 4.9 inches
The air quality index in Charleston is 5% better than the national average
The pollution index in Charleston is 39% better than the national average

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Charleston 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	21°F	37°F	28°F	1.5"
February	22°F	39°F	30°F	1.7"
March	35°F	54°F	44°F	2.1"
April	45°F	66°F	55°F	4.9"
May	55°F	75°F	64°F	3.8"
June	64°F	84°F	74°F	4.7"
July	66°F	86°F	75°F	4.2"
August	64°F	85°F	74°F	2.1"
September	57°F	79°F	67°F	3.0"
October	46°F	67°F	56°F	2.9"
November	35°F	53°F	44°F	2.4"
December	27°F	41°F	33°F	2.4"

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Charleston 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	Charleston	Illinois	National
Air quality index	40	41	42
Pollution index	1,664,370	3,148,694	2,726,193

Charleston air quality

Measurement	Total
Days measured	245
Days with good air quality	224
Days with moderate air quality	21
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.001%
Benzene	0.040%
Carbon Tetrachloride	0.000%
Lead	0.030%
Mercury	0.003%

Average monthly Charleston temperature with heat index

Charleston monthly precipitation with daily maximum

Charleston monthly snow depth with daily maximum

Charleston monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Mattoon, IL	17,637	40	20.0%
Casey, IL	2,752	40	20.0%
Lerna, IL	258	40	20.0%
Neoga, IL	1,633	40	20.0%
Toledo, IL	1,204	40	20.0%
Charleston, IL	20,693	40	20.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Cobourg, ON	20,684	n/a
Pitt Meadows, BC	20,683	n/a
Fort Mill, SC	20,703	49	2.0%
Tukwila, WA	20,710	45	10.0%
Rio Rico, AZ	20,721	31	38.0%
Charleston, IL	20,693	40	20.0%

Source: The Charleston, 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.