Caseyville, IL
Climate overview — based on NOAA 1991-2020 normals from CAHOKIA ST LOUIS AP, IL US.
Year-round temperatures (°F)
Climate summary
Caseyville has an annual average temperature of 56.5°F with about 40.8 inches of precipitation per year. The warmest month is July (average high 89.0°F), and the coldest is January (average low 24.1°F). May is typically the wettest month (4.84 in) and February the driest (1.96 in).
Best time to visit Caseyville
Full guide →Climate change signal
All-time records →154 of 366 (42.1%) of Caseyville's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1990s | 31 | |
| 2000s | 103 | |
| 2010s | 146 | |
| 2020s | 86 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 40.2°F | 24.1°F | 32.1°F | 2.46 in | — | 8 |
| February | 45.6°F | 27.6°F | 36.6°F | 1.96 in | — | 8 |
| March | 56.3°F | 36.0°F | 46.1°F | 3.27 in | — | 11 |
| April | 67.5°F | 45.5°F | 56.5°F | 4.48 in | — | 11 |
| May | 76.7°F | 56.5°F | 66.6°F | 4.84 in | — | 14 |
| June | 85.7°F | 64.7°F | 75.2°F | 4.36 in | — | 11 |
| July | 89.0°F | 68.8°F | 78.9°F | 3.70 in | — | 10 |
| August | 87.8°F | 66.1°F | 76.9°F | 3.68 in | — | 10 |
| September | 80.7°F | 57.1°F | 68.9°F | 3.36 in | — | 9 |
| October | 69.4°F | 46.1°F | 57.7°F | 3.07 in | — | 9 |
| November | 55.3°F | 35.9°F | 45.6°F | 3.34 in | — | 9 |
| December | 44.3°F | 28.6°F | 36.4°F | 2.32 in | — | 8 |
Climate twins of Caseyville
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).