King County (Seattle)
December
Weather in King County for December 2025
Your guide to King County weather in December - trends and predictions
King County typically experiences moderate snowfall in December, with an average of 8 snowy days.
In general, the average temperature in King County at the beginning of December is 6.9 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 6.4 °F by the end of December.
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Snow Forecast ❄️
Temperatures
More
0
Dry days
23
Rainy days
8
Snow days
6°/1°
Temperatures
13 km/h
Avg max wind
86 %
Avg humidity
King County in December average weather
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  7° | 2  7° | 3  6° | 4  6° | 5 7° | 6 7° | |
| 7 8° | 8 8° | 9 5° | 10 6° | 11 8° | 12  6° | 13 7° |
| 14 7° | 15 7° | 16 7° | 17 8° | 18 8° | 19 7° | 20 8° |
| 21 7° | 22 5° | 23  6° | 24 6° | 25 6° | 26 8° | 27 5° |
| 28 7° | 29 5° | 30 7° | 31 7° |
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Temperatures trend during December in King County
See the weather trend as well as the moving average line
December weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 | Patchy rain possible | 7° /1° | 3.1 mm | 0 cm | |
| Dec. 2 | Heavy rain at times | 7° /1° | 6.4 mm | 0.3 cm | |
| Dec. 3 | Overcast | 6° /0° | 3.1 mm | 1 cm | |
| Dec. 4 | Moderate rain at times | 6° /-1° | 7.1 mm | 0 cm | |
| Dec. 5 | Overcast | 7° /1° | 12.5 mm | 0 cm | |
| Dec. 6 | Heavy rain at times | 7° /3° | 7.8 mm | 0 cm | |
| Dec. 7 | Patchy rain possible | 8° /4° | 15.6 mm | 0 cm | |
| Dec. 8 | Heavy rain at times | 8° /3° | 4.6 mm | 0 cm | |
| Dec. 9 | Moderate rain at times | 5° /1° | 9.8 mm | 0 cm | |
| Dec. 10 | Moderate rain at times | 6° /0° | 7.2 mm | 0 cm | |
| Dec. 11 | Moderate or heavy rain shower | 8° /3° | 6.4 mm | 0 cm | |
| Dec. 12 | Cloudy | 6° /2° | 1 mm | 0 cm | |
| Dec. 13 | Heavy rain at times | 7° /1° | 5.2 mm | 0 cm | |
| Dec. 14 | Patchy rain possible | 7° /2° | 3.8 mm | 0 cm | |
| Dec. 15 | Overcast | 7° /2° | 2.8 mm | 0 cm | |
| Dec. 16 | Moderate or heavy rain shower | 7° /2° | 8.4 mm | 0 cm | |
| Dec. 17 | Moderate rain at times | 8° /2° | 3.1 mm | 0 cm | |
| Dec. 18 | Moderate or heavy rain shower | 8° /3° | 15.2 mm | 0.3 cm | |
| Dec. 19 | Moderate or heavy rain shower | 7° /3° | 10.4 mm | 0 cm | |
| Dec. 20 | Overcast | 8° /3° | 4.1 mm | 0.3 cm | |
| Dec. 21 | Overcast | 7° /1° | 13.8 mm | 0.1 cm | |
| Dec. 22 | Moderate or heavy rain shower | 5° /1° | 9.3 mm | 0 cm | |
| Dec. 23 | Partly cloudy | 6° /0° | 6.8 mm | 2.1 cm | |
| Dec. 24 | Moderate or heavy rain shower | 6° /1° | 9 mm | 0 cm | |
| Dec. 25 | Patchy rain possible | 6° /2° | 12 mm | 0.1 cm | |
| Dec. 26 | Moderate rain at times | 8° /2° | 21.1 mm | 0.9 cm | |
| Dec. 27 | Moderate rain at times | 5° /1° | 8.9 mm | 0 cm | |
| Dec. 28 | Patchy rain possible | 7° /1° | 2.4 mm | 0 cm | |
| Dec. 29 | Patchy rain possible | 5° /0° | 9 mm | 0 cm | |
| Dec. 30 | Moderate or heavy rain shower | 7° /2° | 9.2 mm | 0.7 cm | |
| Dec. 31 | Heavy rain at times | 7° /1° | 3.1 mm | 0 cm | |
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Important Notice
Our weather forecast for King County in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the King County forecast closer to your planned date for the most up-to-date weather information.
King County in December - FAQ
What are the expected maximum and minimum temperatures in King County during December?
Prepare for cooler days with highs just around 6° and colder nights, dipping below 1°.
How much rainfall should be expected in King County during December?
Significant rainfall exceeding 209.6 mm is expected in King County during December, occurring over more than 23 days. Preparing for wet conditions is recommended in your planning.
Will it snow in King County in December 2025?
King County experiences an average snowfall of 6.9075 cm during December, occurring over 8 days.
What are the typical wind conditions in King County during December?
The average wind speed in King County during December is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
King County snow forecast December 2025
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December rainfall patterns in King County
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Where is King County?Get accurate weather forecasts for King County, located at latitude 47.606 and longitude -122.332. Stay updated with localized weather information tailored for King County.
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