St. Louis weather in December
December in St. Louis: cold, a little rain, with clean air — a good time to visit.
#10 of 12 months in St. Louis · #575 of 897 destinations to visit in December · comfort 65/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on St. Louis in December
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St. Louis climate normals — December
| Daytime high | 9°C / 49°F | 🧥 cold |
|---|---|---|
| Nighttime low | 1°C / 33°F | |
| Rainfall | 58 mm / 2.3 in | 🌦 some rain |
| Rainy days | 9 days | |
| Humidity | 70% | 💧 humid |
| Dew point | -2°C / 29°F | |
| Sunshine | 5.6 h/day | |
| Daylight | 9.5 h | |
| Wind | 18 km/h / 11 mph | |
| Snowfall | 4.1 cm / 1.6 in | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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St. Louis in December — FAQ
- Is December a good time to visit St. Louis?
- December in St. Louis: cold, a little rain, with clean air — a good time to visit. It ranks #10 of 12 months for St. Louis on SeasonMap's comfort score (65/100).
- What is the weather like in St. Louis in December?
- In December, St. Louis averages a daily high of 9.3°C and a low of 0.7°C, with about 57.8 mm of rain over roughly 8.8 rainy days.
- What is the air quality in St. Louis in December?
- St. Louis has a mean US Air Quality Index of about 32 in December.
- Does it snow in St. Louis in December?
- St. Louis sees roughly 4.1 cm of snowfall in December.