December weather forecastSnohomish, WA
December
Weather in December
The first month of the winter, December, is still a cold month in Snohomish, Washington, with an average temperature ranging between min 33.6°F (0.9°C) and max 42.3°F (5.7°C).Temperature
The coldest month is December, with an average high-temperature of 42.3°F (5.7°C) and an average low-temperature of 33.6°F (0.9°C).Humidity
January, February, November and December, with an average relative humidity of 85%, are the most humid months.Rainfall
December is the month with the most rainfall. Rain falls for 13.8 days and accumulates 2.17" (55mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Snohomish, during December, snow falls for 1.3 days and regularly aggregates up to 0.28" (7mm) of snow. In Snohomish, during the entire year, snow falls for 7.7 days and aggregates up to 3.5" (89mm) of snow.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 7:37 am and sunset at 4:17 pm. On the last day of December, sunrise is at 7:57 am and sunset at 4:25 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 4h 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 value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum high daily UV index of 2 during December translates into the following directions:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Avoiding the Sun during its peak radiation time around midday is a healthy practice. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Snohomish, WA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is August (74.7°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in December: 33.6°F
The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is December (33.6°F).
Average pressure in December
Snohomish, WA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in December
Snohomish, WA
- Average wind speed in December: 4.8mph
The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).
Average humidity in December
Snohomish, WA
- Average humidity in December: 85%
The months with the highest relative humidity are January, February, November and December (85%).
The month with the lowest relative humidity is July (72%).
Average rainfall in December
Snohomish, WA
- Average rainfall in December: 2.17"
The wettest month (with the highest rainfall) is December (2.17").
The driest month (with the least rainfall) is August (0.28").
Average rainfall days in December
Snohomish, WA
- Average rainfall days in December: 13.8 days
The month with the highest number of rainy days is March (15.8 days).
The month with the least rainy days is August (4.8 days).
Average snowfall in December
Snohomish, WA
- Average snowfall in December: 0.28"
The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Snohomish, WA
- Average snowfall days in December: 1.3 days
The month with the highest number of snowfall days is February (2.7 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
Snohomish, 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: 4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 0min).
Average sunshine days in December
Snohomish, WA
- Average sunshine days in December: 15.1 days
The month with the most sunshine days is August (24 days).
The month with the least sunshine days is April (12.3 days).
Average UV index in December
Snohomish, 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, November and December (UV index 2).
Average cloud cover in December
Snohomish, WA
- Average cloud cover in December: 58
The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in December
Snohomish, WA
- Average visibility in December: 5mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April, May, November and December (5mi).
