December weather forecastLynnwood, WA
December
Weather in December
December announces the arrival of winter in Lynnwood with the lowest temperatures observed during the year and frequent showers. Humidity soars high, tying with January, yielding a relative humidity of 84%, the highest of the year. Both the falling temperatures and increasing rainfall, noted at 3.5" (89mm), signal the peak of winter. To end the year, December paints a vivid picture of conventional winter weather.Temperature
Lynnwood's temperature records reveal December as the coldest month, marked by average highs of 43.3°F (6.3°C) and lows of 35.8°F (2.1°C).Humidity
January, February and December, with an average relative humidity of 84%, are the most humid months in Lynnwood.Rainfall
December is the month with the most rainfall. Rain falls for 17.6 days and accumulates 3.5" (89mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Lynnwood, in December, during 2.2 snowfall days, 0.43" (11mm) of snow is typically accumulated. Throughout the year, there are 12.5 snowfall days, and 6.65" (169mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 30min of daylight.On the first day of December, sunrise is at 7:38 am and sunset at 4:18 pm. On the last day of the month, sunrise is at 7:58 am and sunset at 4:27 pm PST.
Sunshine
The average sunshine in December is 4.6h.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 vulnerability from exposure to the Sun's UV rays for average individuals.Note: The maximum UV index of 2 during December translates into these guidelines:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Lynnwood, WA
- Average high temperature in December: 43.3°F
The warmest month (with the highest average high temperature) is August (73.9°F).
The month with the lowest average high temperature is December (43.3°F).
- Average low temperature in December: 35.8°F
The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (35.8°F).
Average pressure in December
Lynnwood, WA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in December
Lynnwood, WA
- Average wind speed in December: 5.5mph
The windiest month (with the highest average wind speed) is November (5.9mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in December
Lynnwood, WA
- Average humidity in December: 84%
The months with the highest relative humidity are January, February and December (84%).
The month with the lowest relative humidity is July (72%).
Average rainfall in December
Lynnwood, WA
- Average rainfall in December: 3.5"
The wettest month (with the highest rainfall) is December (3.5").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in December
Lynnwood, WA
- Average rainfall days in December: 17.6 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (6.8 days).
Average snowfall in December
Lynnwood, WA
- Average snowfall in December: 0.43"
The month with the highest snowfall is February (3.58").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Lynnwood, WA
- Average snowfall days in December: 2.2 days
The month with the highest number of snowfall days is February (4.7 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
Lynnwood, 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 36min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in December
Lynnwood, WA
- Average sunshine days in December: 10.8 days
The month with the most sunshine days is August (22.5 days).
The month with the least sunshine days is November (9.2 days).
Average UV index in December
Lynnwood, WA
- Average UV index in December: 2
The months with the highest UV index are June and 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
Lynnwood, WA
- Average cloud cover in December: 53
The months with the most cloud cover are January and December (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in December
Lynnwood, WA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
