Lake St. Louis, MO
Climate overview — based on NOAA 1991-2020 normals from WELDON SPRING NWS, MO US.
Year-round temperatures (°F)
Climate summary
Lake St. Louis has an annual average temperature of 55.2°F with about 44.4 inches of precipitation per year and 13.5 inches of snow. The warmest month is July (average high 87.5°F), and the coldest is January (average low 21.2°F). May is typically the wettest month (5.09 in) and February the driest (2.43 in). Snow typically falls from November through April.
Best time to visit Lake St. Louis
Full guide →Climate change signal
All-time records →80 of 366 (21.9%) of Lake St. Louis'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.
| 1950s | 9 | |
| 1960s | 78 | |
| 1970s | 40 | |
| 1980s | 33 | |
| 1990s | 28 | |
| 2000s | 38 | |
| 2010s | 94 | |
| 2020s | 46 |
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 | 39.3°F | 21.2°F | 30.3°F | 2.61 in | 4.1 in | 8 |
| February | 44.8°F | 24.4°F | 34.6°F | 2.43 in | 3.7 in | 8 |
| March | 55.2°F | 33.3°F | 44.2°F | 3.74 in | 1.7 in | 10 |
| April | 67.0°F | 43.8°F | 55.4°F | 4.70 in | 0.2 in | 10 |
| May | 75.7°F | 54.2°F | 65.0°F | 5.09 in | — | 13 |
| June | 83.7°F | 63.3°F | 73.5°F | 4.72 in | — | 10 |
| July | 87.5°F | 67.3°F | 77.4°F | 3.92 in | — | 8 |
| August | 86.7°F | 65.4°F | 76.0°F | 3.58 in | — | 8 |
| September | 79.8°F | 57.0°F | 68.4°F | 3.50 in | — | 7 |
| October | 68.3°F | 45.6°F | 56.9°F | 3.37 in | — | 9 |
| November | 55.4°F | 34.9°F | 45.2°F | 3.69 in | 0.8 in | 8 |
| December | 44.0°F | 25.9°F | 35.0°F | 3.07 in | 3.0 in | 8 |
Climate twins of Lake St. Louis
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).