Joliet, IL Weather - Forecast & Monthly Averages

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Weather Quick Facts

The highest monthly average temperature in Joliet for July is 74.2 degrees
The lowest monthly average temperature in Joliet for January is 25.3 degrees
The most monthly precipitation in Joliet occurs in August with 6.8 inches
The air quality index in Joliet is 31% worse than the national average
The pollution index in Joliet is 43% better than the national average

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Joliet 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	18°F	34°F	25°F	2.5"
February	19°F	36°F	27°F	2.8"
March	31°F	50°F	39°F	4.5"
April	41°F	63°F	51°F	4.9"
May	50°F	73°F	61°F	4.7"
June	60°F	83°F	71°F	5.4"
July	64°F	85°F	74°F	5.7"
August	62°F	83°F	72°F	6.8"
September	55°F	77°F	65°F	5.4"
October	44°F	64°F	53°F	5.7"
November	33°F	51°F	41°F	4.9"
December	23°F	37°F	30°F	3.7"

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Joliet 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	Joliet	Illinois	National
Air quality index	55	41	42
Pollution index	1,558,070	3,148,694	2,726,193

Joliet 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	0.010%
Carbon Tetrachloride	0.070%
Lead	0.090%
Mercury	0.010%

Average monthly Joliet temperature with heat index

Joliet monthly precipitation with daily maximum

Joliet monthly snow depth with daily maximum

Joliet monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Channahon, IL	13,281	0	100.0%
Wilmington village, IL	144	0	100.0%
Minooka, IL	11,069	0	100.0%
Wilmington, IL	5,883	0	100.0%
Montgomery, IL	19,515	0	100.0%
Joliet, IL	147,323	55	10.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Rockford, IL	147,441	42	16.0%
Naperville, IL	147,734	55	10.0%
Guelph, ON	147,931	n/a
Bellevue, WA	146,145	45	10.0%
Killeen, TX	148,573	42	16.0%
Joliet, IL	147,323	55	10.0%

Source: The Joliet, 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.