Historical Weather Records & Monthly Climate for Decatur, IL
All-Time High
104°F
All-Time Low
-16°F
Max Daily Snow
11.8"
Max Daily Rain
4.99"
Max Snow Depth
0
Monthly Climate Averages for Decatur, IL
Based on 30 years of historical data (1994 - 2023)
| Month | High (°F) | Low (°F) | Precip (in) | Snow (in) |
|---|---|---|---|---|
| January | 36° | 21° | 2.67" | 5.04" |
| February | 40° | 23° | 2.49" | 4.62" |
| March | 52° | 34° | 3.35" | 2.34" |
| April | 63° | 44° | 4.41" | 0.42" |
| May | 73° | 55° | 4.68" | 0 |
| June | 81° | 65° | 4.32" | 0 |
| July | 84° | 68° | 3.54" | 0 |
| August | 83° | 67° | 2.91" | 0 |
| September | 77° | 60° | 2.92" | 0 |
| October | 65° | 49° | 3.65" | 0.06" |
| November | 51° | 36° | 3.02" | 0.91" |
| December | 40° | 27° | 2.56" | 3.13" |
More Historical Climate Data for Cities in
IL