St. Charles, MO
Climate overview — based on NOAA 1991-2020 normals from ST CHARLES ELM PT, MO US.
Year-round temperatures (°F)
Climate summary
St. Charles has an annual average temperature of 55.5°F with about 45.7 inches of precipitation per year and 9 inches of snow. The warmest month is July (average high 88.0°F), and the coldest is January (average low 21.9°F). May is typically the wettest month (5.45 in) and January the driest (2.74 in). Snow typically falls from December through March.
Best time to visit St. Charles
Full guide →Climate change signal
All-time records →24 of 366 (6.6%) of St. Charles'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.
| 1890s | 10 | |
| 1900s | 22 | |
| 1910s | 33 | |
| 1920s | 27 | |
| 1930s | 102 | |
| 1940s | 32 | |
| 1950s | 50 | |
| 1960s | 11 | |
| 1970s | 16 | |
| 1980s | 15 | |
| 1990s | 7 | |
| 2000s | 14 | |
| 2010s | 12 | |
| 2020s | 15 |
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 | 39.5°F | 21.9°F | 30.7°F | 2.74 in | 4.3 in | 8 |
| February | 44.7°F | 25.2°F | 35.0°F | 2.86 in | 2.6 in | 7 |
| March | 55.2°F | 33.7°F | 44.4°F | 3.63 in | 0.5 in | 10 |
| April | 66.8°F | 44.0°F | 55.4°F | 5.11 in | — | 10 |
| May | 76.0°F | 55.1°F | 65.5°F | 5.45 in | — | 11 |
| June | 84.1°F | 64.3°F | 74.2°F | 4.35 in | — | 9 |
| July | 88.0°F | 68.3°F | 78.2°F | 4.20 in | — | 8 |
| August | 86.8°F | 65.8°F | 76.3°F | 4.07 in | — | 7 |
| September | 80.4°F | 57.2°F | 68.8°F | 3.08 in | — | 7 |
| October | 68.8°F | 45.7°F | 57.3°F | 3.50 in | — | 8 |
| November | 55.3°F | 35.3°F | 45.3°F | 3.73 in | 0.1 in | 8 |
| December | 44.1°F | 26.4°F | 35.2°F | 2.99 in | 1.5 in | 7 |
Climate twins of St. Charles
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).