December weather forecast
Port Townsend, WA

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Victorian design houses from an old age along the beach on a hilly spot overlooking the sea, in Port Townsend, Washington
Victorian design houses from an old age along the beach on a hilly spot overlooking the sea, in Port Townsend, Washington

Weather in December

December in Port Townsend sees the return of winter, with the lowest average temperatures for the year at 37.6°F (3.1°C). It brings with it the festive cheer of Christmas and New Year. The increased rainfall, an expected 2.52" (64mm), blankets the city in a cool dampness. While snowfall is rare, the possibility of a white Christmas isn't entirely out of the picture. The year ends on a wintry note, with chilly temperatures and frequent rains dominating December's weather scene.

Temperature

Port Townsend's December weather, with an average high temperature of 43°F (6.1°C) and an average low temperature of 37.6°F (3.1°C), tends to be the coldest of the year.

Humidity

In Port Townsend, the average relative humidity in December is 82%.

Rainfall

In Port Townsend, in December, it is raining for 18.2 days, with typically 2.52" (64mm) of accumulated precipitation. Throughout the year, there are 180.3 rainfall days, and 21.85" (555mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Port Townsend, in December, during 1 snowfall days, 0.2" (5mm) of snow is typically accumulated. Throughout the year, in Port Townsend, there are 7.8 snowfall days, and 4.84" (123mm) of snow is accumulated.

Ocean temperature

In Port Townsend, the average seawater temperature in December is 46.2°F (7.9°C).
Note: In 46.2°F (7.9°C), cold shock and rapid breathing can occur when swimming at temperatures below 50°F (10°C).

Daylight

The month with the shortest days is December, with an average of 8h and 24min of daylight.
On the first day of the month, sunrise is at 7:41 am and sunset at 4:19 pm. On the last day of December, in Port Townsend, Washington, sunrise is at 8:01 am and sunset at 4:27 pm PST.

Sunshine

In December, the average sunshine in Port Townsend is 4.9h.

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 reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily high UV index of 2 during December translates into the following recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Enhance your sun protection with tightly woven, yet airy clothing. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
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Frequently asked questions

What is the coldest time of year in Port Townsend?

In Port Townsend, December records the average lowest temperatures, peaking at 43°F (6.1°C) and reaching a low of 37.6°F (3.1°C).

How cold does it get in Port Townsend in December?

Port Townsend in December has an average high-temperature of 43°F (6.1°C) and an average low-temperature of 37.6°F (3.1°C).

What is the average humidity in December in Port Townsend?

In December, the average relative humidity in Port Townsend is 82%.

How much does it rain in Port Townsend in December?

In Port Townsend, Washington, in December, it is raining for 18.2 days, with typically 2.52" (64mm) of accumulated precipitation.

How many days does it snow in December in Port Townsend?

In Port Townsend, Washington, in December, snow falls for 1 days, with typically accumulated 0.2" (5mm) of snow.

How cold is the water in December in Port Townsend?

In Port Townsend, the average seawater temperature in December is 46.2°F (7.9°C). Swimming in 46.2°F (7.9°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Port Townsend?

December has the shortest days of the year in Port Townsend, with an average of 8h and 24min of daylight.

What is the average length of the day in December in Port Townsend?

The average day length in December in Port Townsend, Washington, is 8h and 26min.

When are sunrise and sunset in December in Port Townsend?

On the first day of December, sunrise is at 7:41 am and sunset at 4:19 pm. On the last day of the month, sunrise is at 8:01 am and sunset at 4:27 pm PST.

How long on average sun shines in December in Port Townsend?

The average sunshine duration in December in Port Townsend is 4.9h.

What is the month with the lowest UV index in Port Townsend?

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

How high is the UV index in December in Port Townsend?

The average daily maximum UV index in December in Port Townsend, Washington, is 2. A UV Index estimate of 2, and below, represents a low health threat from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
48°F 8.9°C
43°F 6.1°C
43.9°F 6.6°C
Average low temperature
41.9°F 5.5°C
37.6°F 3.1°C
37.6°F 3.1°C
Average pressure
30.03" 763mmHg
30.06" 764mmHg
30.08" 764mmHg
Average wind speed
7.4mph 11.9km/h
7.1mph 11.4km/h
7mph 11.3km/h
Average max. wind speed
8.1mph 13km/h
8mph 12.9km/h
8mph 12.9km/h
Average wind speed gusts
12.2mph 19.6km/h
12mph 19.3km/h
11.6mph 18.7km/h
Average humidity
82%
82%
83%
Average rainfall
2.91" 74mm
2.52" 64mm
2.52" 64mm
Average rainfall days
19.1
18.2
17.8
Average snowfall
0.28" 7mm
0.2" 5mm
1.02" 26mm
Average snowfall days
0.7
1
1.8
Average sea temperature
48.1°F 8.9°C
46.2°F 7.9°C
45.1°F 7.3°C
Average daylight
9h 2min
8h 2min
8h 5min
Average sunshine
5h 1min
4h 5min
4h 5min
Average sunshine days
9.3
10.7
10.6
Average UV index
2
2
2
Average cloud cover
47%
50%
50%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in December
Port Townsend, WA

Average temperature in December - Port Townsend, WA
  • Average high temperature in December: 43°F

The warmest month (with the highest average high temperature) is August (67.8°F).
The month with the lowest average high temperature is December (43°F).

  • Average low temperature in December: 37.6°F

The month with the highest average low temperature is August (55.4°F).
The coldest month (with the lowest average low temperature) is February (37.4°F).

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Average pressure in December
Port Townsend, WA

Average pressure in December - Port Townsend, WA
  • Average pressure in December: 30.06"Hg

The month with the highest atmospheric pressure is January (30.08"Hg).
The months with the lowest atmospheric pressure are March and September (30.01"Hg).

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Average wind speed in December
Port Townsend, WA

Average wind speed in December - Port Townsend, WA
  • Average wind speed in December: 7.1mph

The windiest month (with the highest average wind speed) is November (7.4mph).
The calmest month (with the lowest average wind speed) is August (4mph).

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Average humidity in December
Port Townsend, WA

Average humidity in December - Port Townsend, WA
  • Average humidity in December: 82%

The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is July (75%).

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Average rainfall in December
Port Townsend, WA

Average rainfall in December - Port Townsend, WA
  • Average rainfall in December: 2.52"

The wettest month (with the highest rainfall) is November (2.91").
The driest month (with the least rainfall) is July (0.43").

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Average rainfall days in December
Port Townsend, WA

Average rainfall days in December - Port Townsend, WA
  • Average rainfall days in December: 18.2 days

The month with the highest number of rainy days is March (20.7 days).
The month with the least rainy days is August (6.6 days).

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Average snowfall in December
Port Townsend, WA

Average snowfall in December - Port Townsend, WA
  • Average snowfall in December: 0.2"

The month with the highest snowfall is February (2.87").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Port Townsend, WA

Average snowfall days in December - Port Townsend, WA
  • Average snowfall days in December: 1 days

The month with the highest number of snowfall days is February (2.8 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
Port Townsend, WA

Average sea temperature in December - Port Townsend, WA
  • Average sea temperature in December: 46.2°F

The best month for swimming (with the highest average sea temperature) is August (53°F).
The coldest month (with the lowest average sea temperature) is February (45°F).

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Average daylight in December /
Average sunshine in December
Port Townsend, WA

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

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).

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Average sunshine days in December
Port Townsend, WA

Average sunshine days in December - Port Townsend, WA
  • Average sunshine days in December: 10.7 days

The month with the most sunshine days is August (22.3 days).
The month with the least sunshine days is March (8.2 days).

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Average UV index in December
Port Townsend, WA

Average UV index in December - Port Townsend, 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
Port Townsend, WA

Average cloud cover in December - Port Townsend, WA
  • Average cloud cover in December: 50

The months with the most cloud cover are January, February and December (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 21).

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Average visibility in December
Port Townsend, WA

Average visibility in December - Port Townsend, 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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Port Townsend, Washington, USA

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