Vandalia, IL Weather Forecast & Monthly Average Temperatures

TEMPERATURE	42
HUMIDITY	88
PRESSURE	29.99
WIND COND.	130 4.7

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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"

Did you know?

The highest monthly average temperature in Vandalia for July is 78 degrees.
The lowest monthly average temperature in Vandalia for January is 32 degrees.
The most monthly precipitation in Vandalia occurs in September with 8.9 inches.
The air quality index in Vandalia is 25% better than the national average.
The pollution index in Vandalia is 87% better than the national average.

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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	37	41	50
Pollution index	647,280	3,347,295	5,066,862

Vandalia air quality information

Measurement	Total
Days measured	214
Days with good air quality	201
Days with moderate air quality	13
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Vandalia air quality information

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, State	Population	Air Quality Index	National Avg.
Coffeen, IL	608	37	26%
Mulberry Grove, IL	670	37	26%
Smithboro, IL	171	37	26%
Fillmore, IL	317	37	26%
Ramsey, IL	1,374	37	26%
Vandalia, IL	6,758	37	26%

Cities with similar population

City, State	Population	Air Quality Index	National Avg.
Torrington, WY	6,759	20	60%
Gibsonville, NC	6,759	31	38%
Marion, SC	6,756	40	20%
Taneytown, MD	6,755	43	14%
South Weber, UT	6,762	49	2%
Vandalia, IL	6,758	37	26%

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.