Weather in Seattle in December 2024
- December is usually the coldest month of the year in Seattle;
- December is usually the wettest month of the year in Seattle;
Average weather
Average temperature in Seattle in December
Going from a maximum of +13°C during the day to a minimum of -7°C during the night, the temperature in December averages around +6°C.
The average maximum temperature goes up 35% by the end of the month, compared with the beginning of the month, from +2°C to +9°C.
Is Seattle warm or cold in December?
Seattle is typically cool in December.
Maximum temperatures go down compared to the previous month from +10°C to +7°C. The minimum temperature also goes down from +6°C to +4°C.
Pack a sweater and a jacket as there will be cooler temperatures.
December is the coldest month in Seattle, here is the comparison with other months:
Climate in Seattle in December
| November | December | January | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +10°C | +7°C | +8°C | ||||
| Min. temperature | ||||||
| -11°C | -13°C | -10°C | ||||
| Max. temperature | ||||||
| +18°C | +15°C | +15°C | ||||
| Rainfall | ||||||
| 177 mm | 163 mm | 172 mm | ||||
| Wind | ||||||
| 2 m/s | 1 m/s | 1 m/s | ||||
| Humidity | ||||||
| 84% | 86% | 85% | ||||
| Air pressure | ||||||
| 1015 HPa | 1016 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 2 | 2 | 2 | ||||
| Cloudy days | ||||||
| 14 | 14 | 15 | ||||
| Rainy days | ||||||
| 14 | 14 | 13 | ||||
| Snowy days | ||||||
| 0 | 1 | 1 | ||||
December typically has worse weather conditions compared to November. It’s getting colder in December. From +10°C in the day, the average maximum temperature lowers to +7°C. As December arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 177 mm to 163 mm. Humidity rises from 84% to 86%. Winds are calmer in comparison to November, going down from 2 m/s to 1 m/s on average. The amount of sunny days stay about the same, averaging 2 sunny days during the month.
January brings much the same weather, it remains bad.
Wind
The average wind speed is 3 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Seattle is gradually increasing during December, going from 2 m/s to 5 m/s over the course of the month.
Rain
Snow
December is one of the snowiest months in Seattle.
Here’s how December is compared with other months in the amount of snow, total mm:
How was the weather last December in Seattle?
Climate Change over Years
The climate in Seattle in December has not changed much over the last 43 years.
The average temperature was the lowest in 1990 (+5°C) and the highest in 2020 (+10°C). The driest year was 1985 with only 21 mm of rainfall, and the wettest year was 2022 with 304 mm.
FAQ
Is December a good time to visit Seattle?
Can you sunbathe in Seattle in December?
Is Seattle rainy in December?
Is it sunny in Seattle in December?
Other cities in USA
Monthly weather in Seattle
Source of the data
For this page, we’ve looked at the typical weather in Seattle, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.