December weather forecastAllyn, WA
December
Weather in December
The first month of the winter, December, is also a wintry month in Allyn, Washington, with an average temperature fluctuating between 33.8°F (1°C) and 42.3°F (5.7°C).Temperature
December tends to be the coldest month, with temperatures averaging a daily high of 42.3°F (5.7°C) and a low of 33.8°F (1°C).Humidity
December is the most humid month in Allyn, Washington, with an average relative humidity of 88%.Rainfall
The month with the most rainfall is December, when the rain falls for 18.3 days and typically aggregates up to 5" (127mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Allyn, in December, snow falls for 2.6 days, with typically accumulated 0.83" (21mm) of snow. In Allyn, during the entire year, snow falls for 12.1 days and aggregates up to 7.05" (179mm) of snow.Daylight
The month with the shortest days in Allyn is December, with an average of 8h and 30min of daylight.On the first day of the month, sunrise is at 7:38 am and sunset at 4:22 pm. On the last day of December, in Allyn, Washington, sunrise is at 7:58 am and sunset at 4:30 pm PST.
Sunshine
December has the least sunshine of the year in Allyn, with an average of 3.8h 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 unsafe exposure to UV radiation for the average person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Allyn, WA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in December: 33.8°F
The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (33.8°F).
Average pressure in December
Allyn, WA
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is March (30.01"Hg).
Average wind speed in December
Allyn, WA
- Average wind speed in December: 4.4mph
The windiest month (with the highest average wind speed) is March (5.2mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).
Average humidity in December
Allyn, WA
- Average humidity in December: 88%
The month with the highest relative humidity is December (88%).
The month with the lowest relative humidity is July (69%).
Average rainfall in December
Allyn, WA
- Average rainfall in December: 5"
The wettest month (with the highest rainfall) is December (5").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Allyn, WA
- Average rainfall days in December: 18.3 days
The month with the highest number of rainy days is March (19.7 days).
The month with the least rainy days is August (6 days).
Average snowfall in December
Allyn, WA
- Average snowfall in December: 0.83"
The month with the highest snowfall is February (2.91").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Allyn, WA
- Average snowfall days in December: 2.6 days
The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Allyn, 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: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 3h and 48min).
Average sunshine days in December
Allyn, WA
- Average sunshine days in December: 10.2 days
The month with the most sunshine days is August (22.3 days).
The month with the least sunshine days is November (8.7 days).
Average UV index in December
Allyn, 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
Allyn, WA
- Average cloud cover in December: 60
The month with the most cloud cover is December (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in December
Allyn, WA
- Average visibility in December: 4mi
The months with the highest visibility are June, July and August (6mi).
The months with the lowest visibility are January, February, November and December (4mi).
