December weather forecast
Tacoma, WA

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The city of Tacoma, Washington lit perfectly in the night
The city of Tacoma, Washington lit perfectly in the night

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 of the year in Tacoma, registering average temperatures as high as 43.7°F (6.5°C) and as low as 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 in Tacoma is December, when the rain falls for 18.4 days and typically aggregates up to 4.69" (119mm) of precipitation.

Snowfall

Months with snowfall in Tacoma are January through March, November and December. In Tacoma, Washington, during December, snow falls for 1.3 days and regularly aggregates up to 0.31" (8mm) of snow. In Tacoma, during the entire year, snow falls for 8.9 days and aggregates up to 5.04" (128mm) of snow.

Ocean temperature

In December, the average ocean temperature is 46.9°F (8.3°C).
Note: Swimming in 46.9°F (8.3°C) is deemed hazardous. Exposure to temperatures below 50°F (10°C) leads to immediate severe cold shock and hyperventilation.

Daylight

December has the shortest days of the year, with an average of 8h and 36min of daylight.
On the first day of the month, sunrise is at 7:36 am and sunset at 4:21 pm. On the last day of December, in Tacoma, sunrise is at 7:56 am and sunset at 4:29 pm PST.

Sunshine

With an average of 4h of sunshine, December has the least sunshine of the year.

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 threat to health from unsafe exposure to UV radiation for the average person.
Note: In December, the maximum UV index of 2 translates into these guidelines:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

What part of the year is the coldest in Tacoma?

December is the coldest month, with the temperature often reaching an average high of 43.7°F (6.5°C) and an average low of 34.3°F (1.3°C).

Is it cold in Tacoma during December?

Tacoma in December has an average high-temperature of 43.7°F (6.5°C) and an average low-temperature of 34.3°F (1.3°C).

What is the most humid month in Tacoma?

January and December, with an average relative humidity of 87%, are most humid months.

What is the average humidity in December in Tacoma?

The average relative humidity in December in Tacoma is 87%.

What is the rainiest month in Tacoma?

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.

How much does it rain in Tacoma in December?

In Tacoma, in December, it is raining for 18.4 days, with typically 4.69" (119mm) of accumulated precipitation.

How many days does it snow in December in Tacoma?

In Tacoma, in December, during 1.3 snowfall days, 0.31" (8mm) of snow is typically accumulated.

What is the water temperature in December in Tacoma?

In Tacoma, the average seawater temperature in December is 46.9°F (8.3°C). Swimming in 46.9°F (8.3°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 Tacoma?

December has the shortest days of the year, with an average of 8h and 36min of daylight.

How many hours of daylight does Tacoma have in December?

In December, the average day length in Tacoma, Washington, is 8h and 33min.

What time are sunrise and sunset in December in Tacoma?

In December, on the first day of the month, sunrise is at 7:36 am and sunset at 4:21 pm. On the last day of the month, in Tacoma, sunrise is at 7:56 am and sunset at 4:29 pm PST.

What is the month with the least sunshine in Tacoma?

The month with the least sunshine is December, with an average of 4h of sunshine.

How long on average sun shines in December in Tacoma?

In Tacoma, Washington, the average sunshine duration in December is 4h.

When is the lowest UV index in Tacoma?

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

What is the UV index reading in December in Tacoma?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Tacoma, WA

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).

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Average pressure in December
Tacoma, WA

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).

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Average wind speed in December
Tacoma, WA

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).

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Average humidity in December
Tacoma, WA

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%).

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Average rainfall in December
Tacoma, WA

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").

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Average rainfall days in December
Tacoma, WA

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).

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Average snowfall in December
Tacoma, WA

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").

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Average snowfall days in December
Tacoma, WA

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).

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Average sea temperature in December
Tacoma, WA

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).

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

Average daylight in December / Average sunshine in December - Tacoma, WA
  • Average daylight in December: 8h and 4min

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).

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Average sunshine days in December
Tacoma, WA

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).

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Average UV index in December
Tacoma, WA

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).

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Average cloud cover in December
Tacoma, WA

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).

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Average visibility in December
Tacoma, WA

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).

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Tacoma, Washington, USA

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