St. Charles, IL Weather - Forecast & Monthly Averages

TEMPERATURE	35
HUMIDITY	66
PRESSURE	101830
WIND COND.	180 27.7

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Weather Quick Facts

The highest monthly average temperature in St. Charles for August is 73.7 degrees
The lowest monthly average temperature in St. Charles for February is 24.4 degrees
The most monthly precipitation in St. Charles occurs in August with 8.3 inches
The air quality index in St. Charles is 31% worse than the national average
The pollution index in St. Charles is 450% worse than the national average

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St. Charles 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	20°F	33°F	26°F	3.6"
February	18°F	32°F	24°F	3.0"
March	30°F	49°F	39°F	3.1"
April	39°F	62°F	49°F	5.2"
May	49°F	72°F	60°F	3.7"
June	60°F	83°F	72°F	4.9"
July	62°F	84°F	73°F	7.8"
August	64°F	84°F	74°F	8.3"
September	56°F	80°F	68°F	2.9"
October	47°F	67°F	56°F	4.3"
November	32°F	50°F	40°F	3.1"
December	18°F	32°F	25°F	2.2"

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St. Charles 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	St. Charles	Illinois	National
Air quality index	55	41	42
Pollution index	14,981,300	3,148,694	2,726,193

St. Charles air quality

Measurement	Total
Days measured	365
Days with good air quality	121
Days with moderate air quality	227
Days w/ poor A.Q. for sensitive groups	16
Days with unhealthy air quality	1

Air quality details

Pollutant	Total
Arsenic	0.010%
Benzene	0.140%
Carbon Tetrachloride	0.030%
Lead	0.020%
Mercury	0.010%

Average monthly St. Charles temperature with heat index

St. Charles monthly precipitation with daily maximum

St. Charles monthly snow depth with daily maximum

St. Charles monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Montgomery, IL	19,515	0	100.0%
Kaneville, IL	518	0	100.0%
Big Rock, IL	1,271	0	100.0%
Prestbury, IL	1,978	0	100.0%
Sugar Grove, IL	9,756	0	100.0%
St. Charles, IL	32,612	55	10.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Uniondale, NY	32,621	51	2.0%
Helena, MT	32,655	40	20.0%
Manitowoc, WI	32,558	36	28.0%
Orangeville, ON	32,668	n/a
Matthews, NC	32,682	49	2.0%
St. Charles, IL	32,612	55	10.0%

Source: The St. Charles, 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.