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O'Fallon, Missouri, United States

Saint Charles County, Missouri, United States

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Weather Radar in O'Fallon, Missouri, United States

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FAQ

What are the average monthly temperatures in O'Fallon?

Average temperatures for O'Fallon:

Month	Min Temp	Max Temp
January	-4.4°C (24.0°F)	4.5°C (40.1°F)
February	-2.4°C (27.6°F)	7.2°C (45.0°F)
March	3.5°C (38.4°F)	13.9°C (57.0°F)
April	9.2°C (48.6°F)	20.2°C (68.4°F)
May	15.2°C (59.4°F)	25.4°C (77.7°F)
June	20.2°C (68.4°F)	30.0°C (85.9°F)
July	21.5°C (70.7°F)	31.2°C (88.1°F)
August	19.9°C (67.9°F)	30.1°C (86.2°F)
September	16.0°C (60.9°F)	27.1°C (80.7°F)
October	9.3°C (48.8°F)	19.8°C (67.6°F)
November	3.4°C (38.1°F)	13.1°C (55.5°F)
December	-1.4°C (29.4°F)	6.2°C (43.2°F)

How much rain does O'Fallon get?

The average annual rainfall for O'Fallon is 949mm (37").

How much snow does O'Fallon get?

The average annual snowfall for O'Fallon is 56mm (2").