St. Elmo, IL
Climate overview — based on NOAA 1991-2020 normals from BROWNSTOWN 4 SW, IL US.
Year-round temperatures (°F)
Climate summary
St. Elmo has an annual average temperature of 54.6°F with about 41.2 inches of precipitation per year. The warmest month is July (average high 86.7°F), and the coldest is January (average low 21.3°F). May is typically the wettest month (5.34 in) and December the driest (2.15 in).
Best time to visit St. Elmo
Full guide →Climate change signal
All-time records →0 of 366 (0%) of St. Elmo'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 | 151 | |
| 2000s | 215 |
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 | 37.0°F | 21.3°F | 29.2°F | 2.82 in | — | 10 |
| February | 42.1°F | 25.3°F | 33.7°F | 2.41 in | — | 8 |
| March | 52.4°F | 34.7°F | 43.6°F | 3.17 in | — | 9 |
| April | 64.9°F | 45.4°F | 55.2°F | 4.39 in | — | 10 |
| May | 74.7°F | 55.1°F | 64.9°F | 5.34 in | — | 12 |
| June | 83.6°F | 65.1°F | 74.3°F | 4.13 in | — | 9 |
| July | 86.7°F | 67.0°F | 76.8°F | 3.74 in | — | 8 |
| August | 85.5°F | 64.1°F | 74.8°F | 3.15 in | — | 8 |
| September | 80.0°F | 56.4°F | 68.2°F | 3.38 in | — | 7 |
| October | 66.6°F | 44.9°F | 55.8°F | 2.89 in | — | 7 |
| November | 52.8°F | 35.5°F | 44.2°F | 3.63 in | — | 9 |
| December | 41.6°F | 26.7°F | 34.2°F | 2.15 in | — | 9 |
Climate twins of St. Elmo
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).