December weather forecastTrentwood, WA
December
Weather in December
December, the first month of the winter in Trentwood, is also an icy month, with temperature in the range of an average high of 32°F (0°C) and an average low of 21.9°F (-5.6°C).Temperature
In Trentwood, December is the coldest month, with temperatures averaging a high of 32°F (0°C) and a low of 21.9°F (-5.6°C).Humidity
The average relative humidity in December is 88%.Rainfall
In Trentwood, in December, it is raining for 8.9 days, with typically 2.2" (56mm) of accumulated precipitation. In Trentwood, during the entire year, the rain falls for 125.4 days and collects up to 17.28" (439mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. In Trentwood, during December, snow falls for 13.9 days and regularly aggregates up to 8.9" (226mm) of snow. In Trentwood, during the entire year, snow falls for 56.4 days and aggregates up to 37.4" (950mm) 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 7:17 am and sunset at 3:59 pm. On the last day of December, sunrise is at 7:37 am and sunset at 4:07 pm PST.
Sunshine
The months with the least sunshine are January and December, with an average of 3.8h of sunshine.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: In December, a regular UV index of 1 translates into these guidelines:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Trentwood, WA
- Average high temperature in December: 32°F
The warmest month (with the highest average high temperature) is August (83.3°F).
The month with the lowest average high temperature is December (32°F).
- Average low temperature in December: 21.9°F
The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (21.9°F).
Average pressure in December
Trentwood, WA
- Average pressure in December: 30.17"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in December
Trentwood, WA
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is April (6.1mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).
Average humidity in December
Trentwood, WA
- Average humidity in December: 88%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (43%).
Average rainfall in December
Trentwood, WA
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is January (2.28").
The driest months (with the least rainfall) are July and August (0.35").
Average rainfall days in December
Trentwood, WA
- Average rainfall days in December: 8.9 days
The month with the highest number of rainy days is March (16 days).
The month with the least rainy days is July (5.1 days).
Average snowfall in December
Trentwood, WA
- Average snowfall in December: 8.9"
The month with the highest snowfall is January (10.51").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Trentwood, WA
- Average snowfall days in December: 13.9 days
The month with the highest number of snowfall days is December (13.9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Trentwood, WA
- Average daylight in December: 8h and 30min
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 30min).
- Average sunshine in December: 3h and 48min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 3h and 48min).
Average sunshine days in December
Trentwood, WA
- Average sunshine days in December: 13.4 days
The month with the most sunshine days is July (24.3 days).
The month with the least sunshine days is March (10.3 days).
Average UV index in December
Trentwood, WA
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Trentwood, WA
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in December
Trentwood, WA
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
