O'Fallon, MO Weather - Forecast & Monthly Averages

TEMPERATURE	53
HUMIDITY	80
PRESSURE	102200
WIND COND.

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Weather Quick Facts

The highest monthly average temperature in O'Fallon for July is 78.7 degrees
The lowest monthly average temperature in O'Fallon for January is 32.1 degrees
The most monthly precipitation in O'Fallon occurs in April with 5.3 inches
The air quality index in O'Fallon is 28% worse than the national average
The pollution index in O'Fallon is 12% worse than the national average

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O'Fallon 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	23°F	44°F	32°F	2.1"
February	25°F	46°F	35°F	1.8"
March	36°F	60°F	47°F	3.7"
April	46°F	71°F	58°F	5.3"
May	55°F	78°F	66°F	4.5"
June	65°F	87°F	76°F	4.8"
July	68°F	90°F	79°F	2.9"
August	66°F	89°F	77°F	3.4"
September	58°F	82°F	69°F	3.9"
October	46°F	70°F	57°F	3.0"
November	36°F	59°F	46°F	2.8"
December	27°F	45°F	35°F	3.1"

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O'Fallon 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	O'Fallon	Missouri	National
Air quality index	54	97	42
Pollution index	3,042,530	1,630,255	2,726,193

O'Fallon air quality information

Measurement	Total
Days measured	365
Days with good air quality	134
Days with moderate air quality	221
Days w/ poor A.Q. for sensitive groups	8
Days with unhealthy air quality	2

O'Fallon air quality information

Pollutant	Total
Arsenic	0.010%
Benzene	0.040%
Carbon Tetrachloride	0.010%
Lead	0.010%
Mercury	0.001%

Average monthly O'Fallon temperature with heat index

O'Fallon monthly precipitation with daily maximum

O'Fallon monthly snow depth with daily maximum

O'Fallon monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Chain of Rocks, MO	252	54	8.0%
Lake St. Louis, MO	16,357	54	8.0%
Crystal Lake Park, MO	440	54	8.0%
St. Peters, MO	57,536	54	8.0%
Clarkson Valley, MO	2,619	54	8.0%
O'Fallon, MO	88,132	54	8.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
Palm Coast, FL	88,222	31	38.0%
Champaign, IL	88,288	42	16.0%
Newton, MA	88,322	43	14.0%
Reading, PA	88,333	42	16.0%
Conroe, TX	88,369	52	4.0%
O'Fallon, MO	88,132	54	8.0%

Source: The O'Fallon, MO 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.