Crystal Lake, IL Weather - Forecast & Monthly Averages

TEMPERATURE	50
HUMIDITY	80
PRESSURE	101020
WIND COND.	110 11.2

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Weather Quick Facts

The highest monthly average temperature in Crystal Lake for July is 73.7 degrees
The lowest monthly average temperature in Crystal Lake for January is 23.8 degrees
The most monthly precipitation in Crystal Lake occurs in May with 4.5 inches
The air quality index in Crystal Lake is equal to the national average
The pollution index in Crystal Lake is 80% better than the national average

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Crystal Lake 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	16°F	32°F	24°F	1.4"
February	17°F	34°F	25°F	1.2"
March	30°F	49°F	38°F	2.2"
April	39°F	62°F	50°F	3.8"
May	49°F	73°F	60°F	4.5"
June	59°F	82°F	70°F	4.4"
July	63°F	85°F	74°F	4.1"
August	62°F	83°F	72°F	3.8"
September	54°F	77°F	65°F	3.4"
October	43°F	64°F	53°F	3.1"
November	32°F	50°F	40°F	1.9"
December	21°F	36°F	29°F	2.1"

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Crystal Lake 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	Crystal Lake	Illinois	National
Air quality index	42	41	42
Pollution index	543,516	3,148,694	2,726,193

Crystal Lake air quality

Measurement	Total
Days measured	341
Days with good air quality	240
Days with moderate air quality	100
Days w/ poor A.Q. for sensitive groups	1
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.000%
Benzene	0.004%
Carbon Tetrachloride	0.000%
Lead	0.000%
Mercury	0.000%

Average monthly Crystal Lake temperature with heat index

Crystal Lake monthly precipitation with daily maximum

Crystal Lake monthly snow depth with daily maximum

Crystal Lake monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Greenwood, IL	352	37	26.0%
Pistakee Highlands, IL	3,302	39	22.0%
Wonder Lake, IL	3,955	39	22.0%
Long Lake, IL	3,065	39	22.0%
Hainesville, IL	3,595	39	22.0%
Crystal Lake, IL	39,685	42	16.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Marlborough, MA	39,663	40	20.0%
Romeoville, IL	39,644	55	10.0%
Indian Trail, NC	39,644	49	2.0%
Royal Palm Beach, FL	39,615	36	28.0%
Sumter, SC	39,758	43	14.0%
Crystal Lake, IL	39,685	42	16.0%

Source: The Crystal Lake, 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.