Climate Data O'Fallon
Illinois, United States
Monthly Averages. Elevation: 167m.
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Best Time to Visit: Jun, Aug, Sep. Rainiest: May (103 mm). View current weather →
967 mm
31 °C
Jul -7 °C
Jan 12 km/h
O'Fallon has a mild climate with cool winters (Jan -7°C) and warm summers (Jul 31°C). Annual rainfall totals 967mm.
Monthly Averages
High Low Precipitation
Monthly Wind Speed
km/h
Frequently Asked Questions
What is the climate like in O'Fallon?
O'Fallon has an average annual temperature of 13°C with 967mm of rainfall per year. The warmest month is Jul (31°C) and the coldest is Jan (-7°C).
What is the hottest month in O'Fallon?
The hottest month in O'Fallon is Jul, with an average high of 31°C.
How much rain does O'Fallon get?
O'Fallon receives 967mm of precipitation annually. The wettest month is May (103mm) and the driest is Jan (52mm).
When is the best time to visit O'Fallon?
The best time to visit O'Fallon is during Jun, Aug, Sep, when temperatures are comfortable and rainfall is relatively low.
Data: WorldClim 2.1