December weather forecast
Bellingham, WA

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Scenic landscape of hills and the sea in this small town in Bellingham, Washington
Scenic landscape of hills and the sea in this small town in Bellingham, Washington

Weather in December

Closing the annual cycle, December in Bellingham returns to the cold temperatures, shortened daylight, and significant precipitation that define the Washington winter. Overcast skies, potent winds, and substantial snowfall create a true winter panorama around the city. December carves the year's last weather pattern, witnessing a temperature threshold from 41.9°F (5.5°C) down to 34.9°F (1.6°C) and a short spell of snowfall amounting to 0.39" (10mm). Despite the chilly conditions, the winter charm, complete with seasonal decor and holiday celebrations, make this weather seem inviting. Bellingham's winter, marked by December’s onset, promises an authentic and chilly finish to the year.

Temperature

In Bellingham, December is the coldest month, with temperatures averaging a high of 41.9°F (5.5°C) and a low of 34.9°F (1.6°C).

Humidity

In December, the average relative humidity in Bellingham is 83%.

Rainfall

In Bellingham, in December, it is raining for 15.3 days, with typically 1.93" (49mm) of accumulated precipitation. In Bellingham, during the entire year, the rain falls for 158 days and collects up to 18.7" (475mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Bellingham. In Bellingham, during December, snow falls for 1.5 days and regularly aggregates up to 0.39" (10mm) of snow. Throughout the year, there are 9.4 snowfall days, and 4.65" (118mm) of snow is accumulated.

Ocean temperature

In Bellingham, in December, the average water temperature is 45.7°F (7.6°C).
Note: Swimming in 45.7°F (7.6°C) is deemed hazardous. Exposure to temperatures below 50°F (10°C) leads to immediate severe cold shock and hyperventilation.

Daylight

With an average of 8h and 18min of daylight, December has the shortest days of the year in Bellingham.
On the first day of the month, sunrise is at 7:42 am and sunset at 4:15 pm. On the last day of December, sunrise is at 8:02 am and sunset at 4:23 pm PST.

Sunshine

January and December, with an average of 4.2h of sunshine, are months with the least sunshine.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.
Note: The UV index of 2 during December translates into the following guidance:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

What are the coldest months in Bellingham?

December, on average, is the coldest month, registering a high temperature of 41.9°F (5.5°C) and a low of 34.9°F (1.6°C).

Is December cold in Bellingham?

Bellingham in December has an average high-temperature of 41.9°F (5.5°C) and an average low-temperature of 34.9°F (1.6°C).

What is the average humidity in December in Bellingham?

In Bellingham, the average relative humidity in December is 83%.

How much does it rain in Bellingham in December?

In Bellingham, during December, the rain falls for 15.3 days and regularly aggregates up to 1.93" (49mm) of precipitation.

How many days does it snow in December in Bellingham?

In Bellingham, in December, snow falls for 1.5 days, with typically accumulated 0.39" (10mm) of snow.

What is the water temperature in December in Bellingham?

In Bellingham, Washington, in December, the average water temperature is 45.7°F (7.6°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in Bellingham?

With an average of 8h and 18min of daylight, December has the shortest days of the year in Bellingham, Washington.

What is the average length of the day in December in Bellingham?

In Bellingham, Washington, the average day length in December is 8h and 21min.

What time are sunrise and sunset in December in Bellingham?

In December, on the first day of the month, sunrise is at 7:42 am and sunset at 4:15 pm. On the last day of the month, sunrise is at 8:02 am and sunset at 4:23 pm PST.

What is the month with the least sunshine in Bellingham?

The months with the least sunshine are January and December, with an average of 4.2h of sunshine.

How long on average sun shines in December in Bellingham?

In December, the average sunshine duration is 4.2h.

When is the lowest UV index in Bellingham?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Bellingham.

How high is the UV index in December in Bellingham?

In Bellingham, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
47.3°F 8.5°C
41.9°F 5.5°C
43.5°F 6.4°C
Average low temperature
40.1°F 4.5°C
34.9°F 1.6°C
35.8°F 2.1°C
Average pressure
30.03" 763mmHg
30.07" 764mmHg
30.08" 764mmHg
Average wind speed
6.2mph 10km/h
6.1mph 9.8km/h
6mph 9.7km/h
Average max. wind speed
6.8mph 10.9km/h
6.6mph 10.6km/h
6.5mph 10.5km/h
Average wind speed gusts
10.9mph 17.5km/h
10.6mph 17.1km/h
10.4mph 16.7km/h
Average humidity
83%
83%
84%
Average rainfall
2.64" 67mm
1.93" 49mm
1.77" 45mm
Average rainfall days
16.1
15.3
13.9
Average snowfall
0.31" 8mm
0.39" 10mm
1.02" 26mm
Average snowfall days
0.7
1.5
1.7
Average sea temperature
47.8°F 8.8°C
45.7°F 7.6°C
44.9°F 7.2°C
Average daylight
9h 1min
8h 2min
8h 5min
Average sunshine
4h 3min
4h 1min
4h 1min
Average sunshine days
12.3
13
14.8
Average UV index
2
2
2
Average cloud cover
54%
56%
56%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in December
Bellingham, WA

Average temperature in December - Bellingham, WA
  • Average high temperature in December: 41.9°F

The warmest months (with the highest average high temperature) are July and August (70.3°F).
The month with the lowest average high temperature is December (41.9°F).

  • Average low temperature in December: 34.9°F

The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (34.9°F).

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Average pressure in December
Bellingham, WA

Average pressure in December - Bellingham, WA
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is January (30.08"Hg).
The month with the lowest atmospheric pressure is March (30"Hg).

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Average wind speed in December
Bellingham, WA

Average wind speed in December - Bellingham, WA
  • Average wind speed in December: 6.1mph

The windiest month (with the highest average wind speed) is November (6.2mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).

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Average humidity in December
Bellingham, WA

Average humidity in December - Bellingham, WA
  • Average humidity in December: 83%

The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is July (74%).

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Average rainfall in December
Bellingham, WA

Average rainfall in December - Bellingham, WA
  • Average rainfall in December: 1.93"

The wettest month (with the highest rainfall) is November (2.64").
The driest month (with the least rainfall) is July (0.55").

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Average rainfall days in December
Bellingham, WA

Average rainfall days in December - Bellingham, WA
  • Average rainfall days in December: 15.3 days

The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (7.1 days).

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Average snowfall in December
Bellingham, WA

Average snowfall in December - Bellingham, WA
  • Average snowfall in December: 0.39"

The month with the highest snowfall is February (1.81").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Bellingham, WA

Average snowfall days in December - Bellingham, WA
  • Average snowfall days in December: 1.5 days

The month with the highest number of snowfall days is February (3.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in December
Bellingham, WA

Average sea temperature in December - Bellingham, WA
  • Average sea temperature in December: 45.7°F

The best month for swimming (with the highest average sea temperature) is August (53.2°F).
The coldest month (with the lowest average sea temperature) is February (44.5°F).

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Average daylight in December /
Average sunshine in December
Bellingham, WA

Average daylight in December / Average sunshine in December - Bellingham, WA
  • Average daylight in December: 8h and 2min

The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).

  • Average sunshine in December: 4h and 1min

The months with the most sunshine are July and August (Average sunshine: 10h and 30min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).

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Average sunshine days in December
Bellingham, WA

Average sunshine days in December - Bellingham, WA
  • Average sunshine days in December: 13 days

The month with the most sunshine days is July (22.3 days).
The month with the least sunshine days is April (10.8 days).

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Average UV index in December
Bellingham, WA

Average UV index in December - Bellingham, WA
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Bellingham, WA

Average cloud cover in December - Bellingham, WA
  • Average cloud cover in December: 56

The months with the most cloud cover are January and December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).

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Average visibility in December
Bellingham, WA

Average visibility in December - Bellingham, WA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Bellingham, Washington, USA

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