Vandalia, IL Weather - Forecast & Monthly Averages

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TEMPERATURE	47
HUMIDITY	56
PRESSURE	102540
WIND COND.	30 7.6

Weather Quick Facts

The highest monthly average temperature in Vandalia for July is 77.6 degrees
The lowest monthly average temperature in Vandalia for January is 32.3 degrees
The most monthly precipitation in Vandalia occurs in September with 8.9 inches
The air quality index in Vandalia is 5% better than the national average
The pollution index in Vandalia is 76% better than the national average

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Vandalia 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	25°F	41°F	32°F	3.5"
February	27°F	44°F	34°F	2.0"
March	39°F	58°F	47°F	3.7"
April	48°F	69°F	58°F	7.8"
May	57°F	77°F	66°F	5.4"
June	66°F	86°F	76°F	8.3"
July	68°F	88°F	78°F	7.4"
August	66°F	87°F	76°F	7.2"
September	59°F	81°F	69°F	8.9"
October	48°F	70°F	58°F	5.6"
November	38°F	57°F	47°F	4.2"
December	30°F	45°F	37°F	4.9"

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Vandalia 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	Vandalia	Illinois	National
Air quality index	40	41	42
Pollution index	647,280	3,148,694	2,726,193

Vandalia air quality

Measurement	Total
Days measured	245
Days with good air quality	224
Days with moderate air quality	21
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Air quality details

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

Average monthly Vandalia temperature with heat index

Vandalia monthly precipitation with daily maximum

Vandalia monthly snow depth with daily maximum

Vandalia monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Fillmore, IL	302	40	20.0%
Mulberry Grove, IL	881	40	20.0%
St. Peter, IL	456	40	20.0%
Kinmundy, IL	942	40	20.0%
Smithboro, IL	222	40	20.0%
Vandalia, IL	6,854	40	20.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Contra Costa Centre, CA	6,854	40	20.0%
Hamilton, AL	6,853	39	22.0%
Notre Dame, IN	6,853	42	16.0%
Logan, OH	6,853	25	50.0%
Folcroft, PA	6,856	51	2.0%
Vandalia, IL	6,854	40	20.0%

Source: The Vandalia, 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.