MilBases
Weather & Climate at Scott Air Force Base
St Clair, IL
Summary of the weather and climate in St Clair, IL:
- The average high is 68.6°F and the average low is 45.8°F.
- The hottest month is July with a high of 90.7°F.
- The coldest month is January with a low of 23°F.
- Annual rainfall is 41.65 inches; the rainiest month is May (4.9 in).
- Annual snowfall is 11.8 inches; the snowiest month is January (3.3 in).
Source: NOAA climate normals.
Temperatures through the year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Bars span each month's average low to average high (20°F – 100°F scale).
Monthly averages
| Month | High (°F) | Low (°F) | Rain (in) | Snow (in) | |
|---|---|---|---|---|---|
| January | 42.7 | 23 | 2.29 | 3.3 | |
| February | 47.6 | 26.5 | 2.24 | 3.3 | |
| March | 58.6 | 35.5 | 3.2 | 1.4 | |
| April | 69.6 | 45.9 | 3.86 | 0.2 | |
| May | 78.4 | 55.7 | 4.9 | 0 | |
| June | 87.1 | 64.4 | 4.26 | 0 | |
| July | 90.7 | 68 | 4.05 | 0 | |
| August | 89.8 | 65.5 | 3.3 | 0 | |
| September | 83 | 56.3 | 3.28 | 0 | |
| October | 72.2 | 45.7 | 3.44 | 0 | |
| November | 58.5 | 36.5 | 3.92 | 0.3 | |
| December | 45.1 | 26.5 | 2.91 | 3.3 |