Chester, IL Weather - Forecast & Monthly Averages

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TEMPERATURE	52
HUMIDITY	83
PRESSURE	102302.8
WIND COND.	80 18.5

Weather Quick Facts

The highest monthly average temperature in Chester for July is 78 degrees
The lowest monthly average temperature in Chester for January is 32.9 degrees
The most monthly precipitation in Chester occurs in August with 10.7 inches
The air quality index in Chester is 28% worse than the national average
The pollution index in Chester is 72% better than the national average

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Chester 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	25°F	42°F	33°F	4.6"
February	27°F	45°F	35°F	2.4"
March	39°F	58°F	48°F	3.7"
April	48°F	69°F	58°F	6.6"
May	57°F	77°F	66°F	10.0"
June	66°F	86°F	76°F	8.8"
July	69°F	88°F	78°F	6.8"
August	67°F	87°F	76°F	10.7"
September	59°F	81°F	69°F	7.4"
October	48°F	70°F	58°F	9.0"
November	38°F	57°F	47°F	6.5"
December	30°F	45°F	37°F	7.7"

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Chester 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	Chester	Illinois	National
Air quality index	54	41	42
Pollution index	753,473	3,148,694	2,726,193

Chester air quality

Measurement	Total
Days measured	365
Days with good air quality	134
Days with moderate air quality	221
Days w/ poor A.Q. for sensitive groups	8
Days with unhealthy air quality	2

Air quality details

Pollutant	Total
Arsenic	0.001%
Benzene	0.010%
Carbon Tetrachloride	0.001%
Lead	0.020%
Mercury	0.020%

Average monthly Chester temperature with heat index

Chester monthly precipitation with daily maximum

Chester monthly snow depth with daily maximum

Chester monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Rockwood, IL	25	43	14.0%
Steeleville, IL	1,870	43	14.0%
Cutler, IL	429	43	14.0%
Willisville, IL	596	43	14.0%
Percy, IL	1,110	43	14.0%
Chester, IL	8,264	54	8.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Mammoth Lakes, CA	8,263	47	6.0%
Orting, WA	8,267	30	40.0%
Four Corners, MD	8,268	47	6.0%
Lac la Biche County, AB	8,268	n/a
Spotswood, NJ	8,255	41	18.0%
Chester, IL	8,264	54	8.0%

Source: The Chester, 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.