Decatur, IL Weather - Forecast & Monthly Averages

TEMPERATURE	67
HUMIDITY	76
PRESSURE	100980
WIND COND.	140 31.7

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Weather Quick Facts

The highest monthly average temperature in Decatur for August is 78.1 degrees
The lowest monthly average temperature in Decatur for February is 29.4 degrees
The most monthly precipitation in Decatur occurs in June with 8.1 inches
The air quality index in Decatur is 5% worse than the national average
The pollution index in Decatur is 74% better than the national average

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Decatur 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	24°F	38°F	31°F	6.8"
February	23°F	37°F	29°F	3.4"
March	35°F	56°F	45°F	3.0"
April	43°F	65°F	54°F	4.2"
May	54°F	78°F	66°F	3.1"
June	64°F	86°F	75°F	8.1"
July	65°F	86°F	76°F	4.0"
August	68°F	89°F	78°F	3.9"
September	59°F	85°F	72°F	7.7"
October	49°F	71°F	60°F	7.1"
November	37°F	56°F	45°F	6.1"
December	24°F	37°F	30°F	2.5"

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Decatur 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	Decatur	Illinois	National
Air quality index	44	41	42
Pollution index	703,218	3,148,694	2,726,193

Decatur air quality information

Measurement	Total
Days measured	365
Days with good air quality	255
Days with moderate air quality	110
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Decatur air quality information

Pollutant	Total
Arsenic	0.001%
Benzene	0.020%
Carbon Tetrachloride	0.000%
Lead	0.000%
Mercury	0.000%

Average monthly Decatur temperature with heat index

Decatur monthly precipitation with daily maximum

Decatur monthly snow depth with daily maximum

Decatur monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Macon, IL	1,091	44	12.0%
Long Creek, IL	1,454	44	12.0%
Argenta, IL	1,051	44	12.0%
Oreana, IL	954	44	12.0%
Latham, IL	355	44	12.0%
Decatur, IL	71,857	44	12.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Frederick, MD	71,843	40	20.0%
Lauderhill, FL	71,827	41	18.0%
Pawtucket, RI	71,821	44	12.0%
Pittsburg, CA	71,723	40	20.0%
Redlands, CA	71,680	89	78.0%
Decatur, IL	71,857	44	12.0%

Source: The Decatur, 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.