December weather in Seattle, United States
Averages from 155 days in December across 2020–2024.
Typical conditions
| Average high | 7.9°C |
|---|---|
| Average low | 3.4°C |
| Average mean | 5.6°C |
| Total precipitation | 942.8 mm |
| Rainy days | 116 |
| Average precipitation hours | 8 h |
| Average max wind speed | 21.5 km/h |
| Average sunshine | 3.4 h/day |
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