December weather forecast
Tumtum, WA

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Weather in December

December, the first month of the winter in Tumtum, is still a freezing cold month, with an average temperature varying between 31.3°F (-0.4°C) and 20.3°F (-6.5°C).

Temperature

December stands out as Tumtum's coldest month, with temperatures ranging between an average high of 31.3°F (-0.4°C) and a low of 20.3°F (-6.5°C).

Humidity

In Tumtum, the average relative humidity in December is 89%.

Rainfall

In Tumtum, in December, it is raining for 9.2 days, with typically 2.28" (58mm) of accumulated precipitation. Throughout the year, there are 124.9 rainfall days, and 17.44" (443mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. In Tumtum, during December, snow falls for 16.9 days and regularly aggregates up to 10.47" (266mm) of snow. In Tumtum, during the entire year, snow falls for 69.2 days and aggregates up to 42.99" (1092mm) of snow.

Daylight

The month with the shortest days is December, with an average of 8h and 30min of daylight.
On the first day of the month, sunrise is at 7:19 am and sunset at 4:00 pm. On the last day of December, sunrise is at 7:39 am and sunset at 4:08 pm PST.

Sunshine

The average sunshine in December is 3.5h.

UV index

The months with the lowest UV index are February, November and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The UV index of 1 during December leads to these advisories:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Updated: Jun 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest time of year?

With its average high temperature of 31.3°F (-0.4°C) and a low of 20.3°F (-6.5°C), December is regarded as the coldest month.

How cold is it in Tumtum in December?

In Tumtum, in December, the average high-temperature is 31.3°F (-0.4°C), and the average low-temperature is 20.3°F (-6.5°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, in August is appraised at 84.2°F (29°C).

What is the average humidity in December?

In Tumtum, the average relative humidity in December is 89%.

How much does it rain in Tumtum in December?

In Tumtum, during December, the rain falls for 9.2 days and regularly aggregates up to 2.28" (58mm) of precipitation.

How many days does it snow in December?

In Tumtum, in December, snow falls for 16.9 days, with typically accumulated 10.47" (266mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 8h and 30min of daylight.

What is the average length of the day in December?

The average day length in December is 8h and 28min.

When is the sunrise / sunset in December?

On the first day of December in Tumtum, sunrise is at 7:19 am and sunset at 4:00 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:08 pm PST.

How many hours of sunshine does Tumtum have in December?

In Tumtum, the average sunshine duration in December is 3.5h.

What is the month with the lowest UV index?

The months with the lowest UV index are February, November and December, with an average maximum UV index of 1.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from unsafe 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
Tumtum, WA

Average temperature in December - Tumtum, WA
  • Average high temperature in December: 31.3°F

The warmest month (with the highest average high temperature) is August (84°F).
The month with the lowest average high temperature is December (31.3°F).

  • Average low temperature in December: 20.3°F

The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is December (20.3°F).

Average pressure in December
Tumtum, WA

Average pressure in December - Tumtum, WA
  • Average pressure in December: 30.17"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).

Average wind speed in December
Tumtum, WA

Average wind speed in December - Tumtum, WA
  • Average wind speed in December: 4mph

The windiest month (with the highest average wind speed) is April (5.6mph).
The calmest month (with the lowest average wind speed) is December (4mph).

Average humidity in December
Tumtum, WA

Average humidity in December - Tumtum, WA
  • Average humidity in December: 89%

The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is August (43%).

Average rainfall in December
Tumtum, WA

Average rainfall in December - Tumtum, WA
  • Average rainfall in December: 2.28"

The wettest month (with the highest rainfall) is January (2.4").
The driest month (with the least rainfall) is August (0.31").

Average rainfall days in December
Tumtum, WA

Average rainfall days in December - Tumtum, WA
  • Average rainfall days in December: 9.2 days

The month with the highest number of rainy days is March (16.2 days).
The month with the least rainy days is August (5.1 days).

Average snowfall in December
Tumtum, WA

Average snowfall in December - Tumtum, WA
  • Average snowfall in December: 10.47"

The month with the highest snowfall is January (13.23").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
Tumtum, WA

Average snowfall days in December - Tumtum, WA
  • Average snowfall days in December: 16.9 days

The month with the highest number of snowfall days is December (16.9 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Tumtum, WA
  • Average daylight in December: 8h and 3min

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 30min).

  • Average sunshine in December: 3h and 3min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).

Average sunshine days in December
Tumtum, WA

Average sunshine days in December - Tumtum, WA
  • Average sunshine days in December: 11.5 days

The month with the most sunshine days is July (24.2 days).
The month with the least sunshine days is March (9.7 days).

Average UV index in December
Tumtum, WA

Average UV index in December - Tumtum, WA
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February, November and December (UV index 1).

Average cloud cover in December
Tumtum, WA

Average cloud cover in December - Tumtum, WA
  • Average cloud cover in December: 63

The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 13).

Average visibility in December
Tumtum, WA

Average visibility in December - Tumtum, WA
  • Average visibility in December: 4mi

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).

Tumtum, Washington, USA

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