December weather forecastTacoma, WA
December
Weather in December
December in Tacoma, Washington steers the city into winter, underlining the year with a return to a colder climate. The temperature drops further as the highest temperatures only reach 43.7°F (6.5°C). The 4.69" (119mm) of rainfall ties as the highest level recorded in a month indicating plenty of wet days. The city enters a quiet mode as daylight hours shrink to their shortest duration and the city prepares to welcome a new year. Despite the restrictive weather, the city dons a festive façade promising a merry ambiance amidst the chill.Temperature
December is the coldest month, with an average high-temperature of 43.7°F (6.5°C) and an average low-temperature of 34.3°F (1.3°C).Humidity
January and December, with an average relative humidity of 87%, are the most humid months.Rainfall
The month with the most rainfall is December, when the rain falls for 18.4 days and typically aggregates up to 4.69" (119mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In Tacoma, in December, snow falls for 1.3 days, with typically accumulated 0.31" (8mm) of snow. Throughout the year, there are 8.9 snowfall days, and 5.04" (128mm) of snow is accumulated.Ocean temperature
In Tacoma, in December, the average water temperature is 46.9°F (8.3°C).Note: Entering waters of 46.9°F (8.3°C) is life-endangering. A mere moment in 55.4°F (13°C) waters feels piercing cold, and below 50°F (10°C) it can lead to immediate cold shock and cessation of breathing control, depending on body resilience.
Daylight
December has the shortest days of the year in Tacoma, with an average of 8h and 36min of daylight.On the first day of December, sunrise is at 7:36 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:56 am and sunset at 4:29 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 4h of sunshine.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 minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. To guard against the harmful effects of the Sun, minimize exposure during midday. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Tacoma, WA
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is August (78.1°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in December: 34.3°F
The month with the highest average low temperature is August (52.7°F).
The coldest months (with the lowest average low temperature) are February and December (34.3°F).
Average pressure in December
Tacoma, WA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in December
Tacoma, WA
- Average wind speed in December: 4.6mph
The windiest month (with the highest average wind speed) is March (5.2mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in December
Tacoma, WA
- Average humidity in December: 87%
The months with the highest relative humidity are January and December (87%).
The month with the lowest relative humidity is July (68%).
Average rainfall in December
Tacoma, WA
- Average rainfall in December: 4.69"
The wettest month (with the highest rainfall) is December (4.69").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in December
Tacoma, WA
- Average rainfall days in December: 18.4 days
The month with the highest number of rainy days is March (20.1 days).
The month with the least rainy days is August (5 days).
Average snowfall in December
Tacoma, WA
- Average snowfall in December: 0.31"
The month with the highest snowfall is February (2.28").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Tacoma, WA
- Average snowfall days in December: 1.3 days
The month with the highest number of snowfall days is February (3.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in December
Tacoma, WA
- Average sea temperature in December: 46.9°F
The best month for swimming (with the highest average sea temperature) is August (53.7°F).
The coldest month (with the lowest average sea temperature) is February (45.8°F).
Average daylight in December /
Average sunshine in December
Tacoma, WA
- Average daylight in December: 8h and 36min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 0min).
Average sunshine days in December
Tacoma, WA
- Average sunshine days in December: 9.5 days
The month with the most sunshine days is August (23.4 days).
The month with the least sunshine days is February (9 days).
Average UV index in December
Tacoma, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Tacoma, WA
- Average cloud cover in December: 59
The month with the most cloud cover is December (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in December
Tacoma, WA
- Average visibility in December: 5mi
The months with the highest visibility are June, July and August (6mi).
The months with the lowest visibility are January, February, March, April, May, September, October, November and December (5mi).
