December weather forecastPort Townsend, WA
December
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 coldest month, December, registers temperatures that range from a high of 43°F (6.1°C) to a low of 37.6°F (3.1°C).Humidity
The average relative humidity in December is 82%.Rainfall
In Port Townsend, during December, the rain falls for 18.2 days and regularly aggregates up to 2.52" (64mm) of precipitation. In Port Townsend, Washington, during the entire year, the rain falls for 180.3 days and collects up to 21.85" (555mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Port Townsend, during December, snow falls for 1 days and regularly aggregates up to 0.2" (5mm) of snow. In Port Townsend, during the entire year, snow falls for 7.8 days and aggregates up to 4.84" (123mm) of snow.Ocean temperature
In Port Townsend, in December, the average water temperature is 46.2°F (7.9°C).Note: 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.
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, sunrise is at 8:01 am and sunset at 4:27 pm PST.
Sunshine
In December, the average sunshine is 4.9h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: An average maximum UV index of 2 in December leads to these recommendations:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
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).
Average daylight in December /
Average sunshine in December
Port Townsend, WA
- Average daylight in December: 8h and 24min
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 54min
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).
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).
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).
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).
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).
