December weather forecastSkykomish, WA
December
Weather in December
The first month of the winter, December, is also a wintry month in Skykomish, Washington, with temperature in the range of an average high of 32.9°F (0.5°C) and an average low of 22.1°F (-5.5°C).Temperature
December, with its high-temperature average of 32.9°F (0.5°C) and a low-temperature average of 22.1°F (-5.5°C), is the coldest month.Humidity
The average relative humidity in December is 91%.Rainfall
In Skykomish, during December, the rain falls for 16.6 days and regularly aggregates up to 8.82" (224mm) of precipitation. Throughout the year, there are 207.7 rainfall days, and 61.81" (1570mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, November and December. In Skykomish, in December, snow falls for 11 days, with typically accumulated 12.44" (316mm) of snow. Throughout the year, there are 46.1 snowfall days, and 58.62" (1489mm) of snow is accumulated.Daylight
With an average of 8h and 30min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:33 am and sunset at 4:15 pm. On the last day of December, sunrise is at 7:53 am and sunset at 4:23 pm PST.
Sunshine
January, February and December, with an average of 3h of sunshine, are months with the least sunshine.UV index
The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 2 during December leads to these instructions:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Skykomish, WA
- Average high temperature in December: 32.9°F
The warmest month (with the highest average high temperature) is August (69.4°F).
The month with the lowest average high temperature is December (32.9°F).
- Average low temperature in December: 22.1°F
The month with the highest average low temperature is August (44.2°F).
The coldest month (with the lowest average low temperature) is December (22.1°F).
Average pressure in December
Skykomish, WA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (29.98"Hg).
Average wind speed in December
Skykomish, WA
- Average wind speed in December: 4.4mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest months (with the lowest average wind speed) are August and September (3.4mph).
Average humidity in December
Skykomish, WA
- Average humidity in December: 91%
The month with the highest relative humidity is February (93%).
The months with the lowest relative humidity are July and August (73%).
Average rainfall in December
Skykomish, WA
- Average rainfall in December: 8.82"
The wettest month (with the highest rainfall) is January (9.96").
The driest month (with the least rainfall) is July (0.94").
Average rainfall days in December
Skykomish, WA
- Average rainfall days in December: 16.6 days
The month with the highest number of rainy days is April (22.6 days).
The month with the least rainy days is August (9.9 days).
Average snowfall in December
Skykomish, WA
- Average snowfall in December: 12.44"
The month with the highest snowfall is February (16.26").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Skykomish, WA
- Average snowfall days in December: 11 days
The month with the highest number of snowfall days is December (11 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Skykomish, 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 0min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 0min).
Average sunshine days in December
Skykomish, WA
- Average sunshine days in December: 8.6 days
The month with the most sunshine days is August (17.9 days).
The months with the least sunshine days are February and April (5.8 days).
Average UV index in December
Skykomish, WA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February and November (UV index 1).
Average cloud cover in December
Skykomish, WA
- Average cloud cover in December: 69
The month with the most cloud cover is March (Cloud cover 71).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in December
Skykomish, WA
- Average visibility in December: 4mi
The months with the highest visibility are July and August (5mi).
The months with the lowest visibility are January and February (3mi).
