Historical Weather Records & Monthly Climate for O'Fallon, MO
All-Time High
109°F
All-Time Low
-22°F
Max Daily Snow
8.3"
Max Daily Rain
4.47"
Max Snow Depth
10"
Monthly Climate Averages for O'Fallon, MO
Based on 30 years of historical data (1994 - 2023)
| Month | High (°F) | Low (°F) | Precip (in) | Snow (in) |
|---|---|---|---|---|
| January | 40° | 24° | 2.56" | 4.26" |
| February | 44° | 27° | 2.44" | 3.83" |
| March | 55° | 37° | 3.96" | 2.03" |
| April | 66° | 47° | 4.49" | 0.33" |
| May | 75° | 57° | 4.93" | 0 |
| June | 84° | 67° | 4.23" | 0 |
| July | 88° | 71° | 3.71" | 0 |
| August | 86° | 70° | 3.58" | 0 |
| September | 79° | 62° | 3" | 0 |
| October | 67° | 51° | 3.45" | 0.02" |
| November | 54° | 39° | 3.08" | 0.81" |
| December | 44° | 29° | 2.5" | 2.83" |
More Historical Climate Data for Cities in
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