Washington weather in December
December in Washington: cold, rainy, with clean air — a good time to visit.
#11 of 12 months in Washington · #401 of 604 destinations to visit in December · comfort 62/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Washington climate normals — December
| Daytime high | 10°C / 49°F | 🧥 cold |
|---|---|---|
| Nighttime low | 1°C / 35°F | |
| Feels like (high) | 7°C / 45°F | |
| Rainfall | 119 mm / 4.7 in | 🌧 rainy |
| Rainy days | 9 days | |
| Humidity | 73% | 💧 humid |
| Dew point | 0°C / 31°F | |
| Sunshine | 5.8 h/day | |
| Daylight | 9.5 h | |
| Wind | 16 km/h / 10 mph | |
| Snowfall | 1.6 cm / 0.6 in | |
| Air quality (US AQI) | 46 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Washington in December — FAQ
- Is December a good time to visit Washington?
- December in Washington: cold, rainy, with clean air — a good time to visit. It ranks #11 of 12 months for Washington on SeasonMap's comfort score (62/100).
- What is the weather like in Washington in December?
- In December, Washington averages a daily high of 9.7°C and a low of 1.4°C, with about 118.8 mm of rain over roughly 9 rainy days.
- What is the air quality in Washington in December?
- Washington has a mean US Air Quality Index of about 46 in December.
- Does it snow in Washington in December?
- Washington sees roughly 1.6 cm of snowfall in December.