December weather forecastLongview, WA
December
Weather in December
December brings with it the full swing of winter in Longview, culminating in the coldest temperatures of the year. The city gets carpeted in a white cover with December recording snowfall with 0.24" (6mm), however minor it may be. Short days accompany the early sunsets, often plunging the city into darkness by early evening. Rainfall remains consistently high throughout the month, indicating the continuation of a wet and chilly winter. With temperatures often hovering around freezing point, proper weather gear for warmth during outdoor ventures becomes a necessity.Temperature
December is Longview's coldest month, registering average high temperatures of 42.3°F (5.7°C) and lows of 32.7°F (0.4°C).Humidity
January, February, November and December, with an average relative humidity of 88%, are the most humid months.Rainfall
In Longview, Washington, during December, the rain falls for 18.5 days and regularly aggregates up to 3.58" (91mm) of precipitation. In Longview, during the entire year, the rain falls for 175.5 days and collects up to 25.83" (656mm) of precipitation.Snowfall
Months with snowfall are January through March, November and December. In December, it is snowing for 0.9 days. Throughout December, 0.24" (6mm) of snow is accumulated. In Longview, during the entire year, snow falls for 6.7 days and aggregates up to 3.54" (90mm) of snow.Ocean temperature
In Longview, Washington, in December, the average water temperature is 47.8°F (8.8°C).Note: Diving into 47.8°F (8.8°C) when it's under 50°F (10°C) can cause immediate cold shock symptoms, marked by hyperventilation.
Daylight
With an average of 8h and 42min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:34 am and sunset at 4:27 pm. On the last day of December, in Longview, sunrise is at 7:54 am and sunset at 4:36 pm PST.
Sunshine
The months with the least sunshine are January, February and December, with an average of 3.5h of sunshine.UV index
In December, the average daily maximum UV index in Longview is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the average person.Note: In December, the UV index of 2 transforms into the following advice:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Employ a wide-brim hat for potent defense against up to 50% of UV rays. 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
Longview, WA
- Average high temperature in December: 42.3°F
The warmest month (with the highest average high temperature) is August (77.9°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in December: 32.7°F
The month with the highest average low temperature is August (49.8°F).
The coldest month (with the lowest average low temperature) is December (32.7°F).
Average pressure in December
Longview, 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 August and September (30.01"Hg).
Average wind speed in December
Longview, WA
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is January (4.8mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).
Average humidity in December
Longview, WA
- Average humidity in December: 88%
The months with the highest relative humidity are January, February, November and December (88%).
The month with the lowest relative humidity is July (72%).
Average rainfall in December
Longview, WA
- Average rainfall in December: 3.58"
The wettest month (with the highest rainfall) is January (3.9").
The driest month (with the least rainfall) is August (0.39").
Average rainfall days in December
Longview, WA
- Average rainfall days in December: 18.5 days
The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is July (6.1 days).
Average snowfall in December
Longview, WA
- Average snowfall in December: 0.24"
The month with the highest snowfall is January (1.26").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Longview, WA
- Average snowfall days in December: 0.9 days
The month with the highest number of snowfall days is February (2.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in December
Longview, WA
- Average sea temperature in December: 47.8°F
The best month for swimming (with the highest average sea temperature) is September (53.8°F).
The coldest month (with the lowest average sea temperature) is February (46.6°F).
Average daylight in December /
Average sunshine in December
Longview, WA
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 3h and 30min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 30min).
Average sunshine days in December
Longview, WA
- Average sunshine days in December: 10.2 days
The month with the most sunshine days is July (22 days).
The month with the least sunshine days is March (8.9 days).
Average UV index in December
Longview, WA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in December
Longview, WA
- Average cloud cover in December: 64
The months with the most cloud cover are February and March (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in December
Longview, WA
- Average visibility in December: 4mi
The month with the highest visibility is August (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, September, October, November and December (4mi).
