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Whatcom County (North Cascades National Park)
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United States weather

Weather in Whatcom County, Washington for December 2026

Your guide to Whatcom County weather in December - trends and predictions

    Snow Forecast ❄️

  • Expect heavy snowfall in Whatcom County during December, with an average of 17 snowy days.

    • Temperatures

  • In general, the average temperature in Whatcom County at the beginning of December is -0.3 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of -0.6 °F by the end of December.

    • More

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Average dry days
6
Dry days
Average rainy days
8
Rainy days
Average snowy days
17
Snow days
Average temperatures
0°/-3°
Temperatures
Average wind speed
8 km/h
Avg max wind
Average humidity
92 %
Avg humidity

Whatcom County Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
0°
2
Mist
0°
3
Mist
-1°
4
Heavy snow
-1°
5
Moderate rain
0°
6
Light rain
0°
7
Moderate or heavy snow showers
0°
8
Heavy rain
2°
9
Moderate snow
1°
10
Heavy rain
2°
11
Moderate rain
1°
12
Light rain
1°
13
Fog
3°
14
Moderate or heavy rain shower
4°
15
Heavy rain
5°
16
Patchy moderate snow
0°
17
Moderate snow
0°
18
Heavy snow
0°
19
Moderate snow
-4°
20
Heavy snow
-3°
21
Moderate or heavy snow with thunder
-1°
22
Moderate or heavy snow showers
-3°
23
Mist
-3°
24
Moderate or heavy snow showers
1°
25
Patchy moderate snow
1°
26
Heavy snow
-1°
27
Moderate snow
-7°
28
Overcast
-4°
29
Mist
1°
30
Overcast
3°
31
Cloudy
3°

Temperatures trend during December in Whatcom County

See the weather trend as well as the moving average line

December weather in Whatcom County day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Overcast
Overcast
 0° /-3° 1.5 mm 1.1 cm
Dec. 2 Mist
Mist
 0° /-3° 0 mm 0 cm
Dec. 3 Mist
Mist
 -1° /-4° 0 mm 0 cm
Dec. 4 Heavy snow
Heavy snow
 -1° /-2° 38.7 mm 13.1 cm
Dec. 5 Moderate rain
Moderate rain
 0° /-1° 41.1 mm 0 cm
Dec. 6 Light rain
Light rain
 0° /-1° 36.7 mm 0 cm
Dec. 7 Moderate or heavy snow showers
Moderate or heavy snow showers
 0° /-2° 23.7 mm 2.2 cm
Dec. 8 Heavy rain
Heavy rain
 2° /0° 165.6 mm 1.8 cm
Dec. 9 Moderate snow
Moderate snow
 1° /-1° 77.7 mm 1.5 cm
Dec. 10 Heavy rain
Heavy rain
 2° /-1° 114.7 mm 0 cm
Dec. 11 Moderate rain
Moderate rain
 1° /-1° 67.6 mm 0 cm
Dec. 12 Light rain
Light rain
 1° /-1° 11.1 mm 0 cm
Dec. 13 Fog
Fog
 3° /1° 3 mm 0 cm
Dec. 14 Moderate or heavy rain shower
Moderate or heavy rain shower
 4° /1° 20.5 mm 0 cm
Dec. 15 Heavy rain
Heavy rain
 5° /-1° 159 mm 0 cm
Dec. 16 Patchy moderate snow
Patchy moderate snow
 0° /-3° 28.8 mm 1.1 cm
Dec. 17 Moderate snow
Moderate snow
 0° /-4° 140.2 mm 7.2 cm
Dec. 18 Heavy snow
Heavy snow
 0° /-3° 92.8 mm 50.7 cm
Dec. 19 Moderate snow
Moderate snow
 -4° /-6° 14.4 mm 10.4 cm
Dec. 20 Heavy snow
Heavy snow
 -3° /-5° 54.3 mm 33.1 cm
Dec. 21 Moderate or heavy snow with thunder
Moderate or heavy snow with thunder
 -1° /-3° 144.5 mm 104.4 cm
Dec. 22 Moderate or heavy snow showers
Moderate or heavy snow showers
 -3° /-6° 46.7 mm 33.7 cm
Dec. 23 Mist
Mist
 -3° /-7° 12 mm 8.7 cm
Dec. 24 Moderate or heavy snow showers
Moderate or heavy snow showers
 1° /-4° 24.7 mm 4 cm
Dec. 25 Patchy moderate snow
Patchy moderate snow
 1° /-5° 6.5 mm 0.9 cm
Dec. 26 Heavy snow
Heavy snow
 -1° /-6° 88.9 mm 55.8 cm
Dec. 27 Moderate snow
Moderate snow
 -7° /-12° 13.4 mm 9.7 cm
Dec. 28 Overcast
Overcast
 -4° /-12° 0 mm 0 cm
Dec. 29 Mist
Mist
 1° /-3° 0 mm 0 cm
Dec. 30 Overcast
Overcast
 3° /-1° 0 mm 0 cm
Dec. 31 Cloudy
Cloudy
 3° /-1° 0 mm 0 cm
Next
Important Notice
Our weather forecast for Whatcom 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 Whatcom County forecast closer to your planned date for the most up-to-date weather information.
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Whatcom County in December - FAQ

What are the expected maximum and minimum temperatures in Whatcom County during December?
Brace for cold days with temperatures not exceeding 0° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.

How much rainfall should be expected in Whatcom County during December?
Significant rainfall exceeding 1428.1 mm is expected in Whatcom County during December, occurring over more than 8 days. Preparing for wet conditions is recommended in your planning.

Will it snow in Whatcom County in December 2026?
Whatcom County experiences an average snowfall of 339.3 cm during December, occurring over 17 days.

What are the typical wind conditions in Whatcom County during December?
The average wind speed in Whatcom County during December is 8 km/h, suggesting breezy to windy conditions, depending on your activities.

Whatcom County snow forecast December 2026

Track daily snowfall levels and discover Whatcom County’s snowy potential this December ❄️
On average, Whatcom County sees 17 snowy days during December, with approximately 339.3 cm of total snowfall.

December rainfall patterns in Whatcom County

Explore the daily rainfall trends and prepare for Whatcom Countys December weather 💧
Typically, Whatcom County has 8 rainy days in December with a total of 1428.1 mm of rainfall.
Top locations in Whatcom County
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North Cascades National Park
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Location coordinates Where is Whatcom County?

Get accurate weather forecasts for Whatcom County, located at latitude 48.833 and longitude -121.347. Stay updated with localized weather information tailored for Whatcom County.

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