December weather forecastTumtum, WA
December
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 8h and 30min
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 30min
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: 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: 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: 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: 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).
