Joliet, IL Weather Forecast & Monthly Average Temperatures

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TEMPERATURE	38
HUMIDITY	60
PRESSURE	30.34
WIND COND.	200 9.2

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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"

Did you know?

The highest monthly average temperature in Joliet for July is 74 degrees.
The lowest monthly average temperature in Joliet for January is 25 degrees.
The most monthly precipitation in Joliet occurs in August with 6.8 inches.
The air quality index in Joliet is 21% worse than the national average.
The pollution index in Joliet is 69% better than the national average.

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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	60	41	50
Pollution index	1,558,070	3,347,295	5,066,862

Joliet air quality information

Measurement	Total
Days measured	365
Days with good air quality	72
Days with moderate air quality	281
Days w/ poor A.Q. for sensitive groups	11
Days with unhealthy air quality	1

Joliet air quality information

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, State	Population	Air Quality Index	National Avg.
Minooka, IL	11,786	1	98%
Wilmington, IL	6,010	1	98%
Elwood, IL	2,144	1	98%
Montgomery, IL	19,055	1	98%
Oswego, IL	33,245	1	98%
Joliet, IL	147,515	60	20%

Cities with similar population

City, State	Population	Air Quality Index	National Avg.
Torrance, CA	147,307	74	48%
Bridgeport, CT	147,022	47	6%
Hollywood, FL	148,114	41	18%
Paterson, NJ	146,894	53	6%
Clarksville, TN	146,281	41	18%
Joliet, IL	147,515	60	20%

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.