December weather forecastFederal Way, WA
December
Weather in December
Taking cues from November, December indulges in the frigid tenderness of winter, closing the annual climatic cycle in Federal Way. This month sees an uptick in rainfall, with the maximum volume of 4.72" (120mm), marking the wettest time of the year. Gently dusted in snow, Federal Way adorns a winter-white landscape with an average snowfall of 0.59" (15mm). Daylight proves scarce, lasting only about 8.6 hours, owing to the winter solstice. With an average visibility of 5 miles, the breathtaking view of the cityscape under the white veil mesmerizes visitors and residents alike.Temperature
In Federal Way, Washington, the lowest average temperatures are observed in December, with a high of 42.6°F (5.9°C) and a low of 34.2°F (1.2°C).Humidity
January and December, with an average relative humidity of 86%, are the most humid months.Rainfall
December is the month with the most rainfall in Federal Way. Rain falls for 18.2 days and accumulates 4.72" (120mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Federal Way, in December, snow falls for 2.1 days, with typically accumulated 0.59" (15mm) of snow. In Federal Way, during the entire year, snow falls for 13.3 days and aggregates up to 7.01" (178mm) 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 December, sunrise is at 7:36 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:56 am and sunset at 4:29 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 4.2h 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 of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: A maximum daily UV index of 2 during December morphs into the following directions:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. 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
Federal Way, WA
- Average high temperature in December: 42.6°F
The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is December (42.6°F).
- Average low temperature in December: 34.2°F
The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).
Average pressure in December
Federal Way, WA
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in December
Federal Way, WA
- Average wind speed in December: 4.5mph
The windiest month (with the highest average wind speed) is March (5.1mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).
Average humidity in December
Federal Way, WA
- Average humidity in December: 86%
The months with the highest relative humidity are January and December (86%).
The month with the lowest relative humidity is July (68%).
Average rainfall in December
Federal Way, WA
- Average rainfall in December: 4.72"
The wettest month (with the highest rainfall) is December (4.72").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Federal Way, WA
- Average rainfall days in December: 18.2 days
The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is August (5.9 days).
Average snowfall in December
Federal Way, WA
- Average snowfall in December: 0.59"
The month with the highest snowfall is February (3.27").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Federal Way, WA
- Average snowfall days in December: 2.1 days
The month with the highest number of snowfall days is February (4.4 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
Federal Way, 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: 4h and 12min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in December
Federal Way, WA
- Average sunshine days in December: 10.4 days
The month with the most sunshine days is August (22.8 days).
The months with the least sunshine days are February and November (8.5 days).
Average UV index in December
Federal Way, 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
Federal Way, WA
- Average cloud cover in December: 57
The month with the most cloud cover is December (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in December
Federal Way, WA
- Average visibility in December: 5mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, October, November and December (5mi).
