Lake Forest, IL Weather - Forecast & Monthly Averages

TEMPERATURE	31
HUMIDITY	75
PRESSURE	100580
WIND COND.	300 27.7

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Weather Quick Facts

The highest monthly average temperature in Lake Forest for August is 71.2 degrees
The lowest monthly average temperature in Lake Forest for February is 21.8 degrees
The most monthly precipitation in Lake Forest occurs in June with 5.1 inches
The air quality index in Lake Forest is 31% worse than the national average
The pollution index in Lake Forest is 39% worse than the national average

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Lake Forest 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	33°F	25°F	4.0"
February	13°F	30°F	22°F	3.3"
March	25°F	45°F	35°F	3.0"
April	35°F	60°F	48°F	2.7"
May	43°F	71°F	57°F	3.9"
June	55°F	83°F	70°F	5.1"
July	56°F	83°F	71°F	4.4"
August	59°F	83°F	71°F	3.9"
September	49°F	78°F	63°F	1.9"
October	42°F	66°F	54°F	2.3"
November	28°F	49°F	39°F	5.0"
December	19°F	32°F	26°F	3.5"

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Lake Forest 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	Lake Forest	Illinois	National
Air quality index	55	41	42
Pollution index	3,795,410	3,148,694	2,726,193

Lake Forest 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	0.030%
Benzene	0.050%
Carbon Tetrachloride	0.010%
Lead	0.003%
Mercury	0.310%

Average monthly Lake Forest temperature with heat index

Lake Forest monthly precipitation with daily maximum

Lake Forest monthly snow depth with daily maximum

Lake Forest monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Round Lake Park, IL	7,744	39	22.0%
Gages Lake, IL	9,939	39	22.0%
Third Lake, IL	1,160	39	22.0%
Old Mill Creek, IL	200	39	22.0%
Green Oaks, IL	3,882	39	22.0%
Lake Forest, IL	19,497	55	10.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Cumberland, MD	19,495	36	28.0%
Salmon Arm, BC	19,494	n/a
Salmon Creek, WA	19,506	38	24.0%
Montgomery, IL	19,515	0	100.0%
Franconia, VA	19,478	47	6.0%
Lake Forest, IL	19,497	55	10.0%

Source: The Lake Forest, 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.