December weather forecastWest Linn, OR
December
Weather in December
December in West Linn, Oregon means a full swing into the cold and festive winter season. The mercury hovers from 34.3°F (1.3°C) to 44.4°F (6.9°C), confirming the arrival of winter. A notable feature of the month is the shortest day of the year, the winter solstice. Cozy hearths, twinkling lights, and the holiday hustle offer a contrast to the outdoor chill. In a blend of cold weather and warm hearts, December concludes the year on a joyful note.Temperature
December is the month that records the lowest temperatures, with averages ranging from a high of 44.4°F (6.9°C) to a low of 34.3°F (1.3°C).Humidity
The average relative humidity in December is 83%.Rainfall
The month with the most rainfall is December, when the rain falls for 19.2 days and typically aggregates up to 5.16" (131mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In December, it is snowing for 0.9 days. Throughout December, 0.51" (13mm) of snow is accumulated. In West Linn, Oregon, during the entire year, snow falls for 6.1 days and aggregates up to 4.17" (106mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 48min of daylight.On the first day of the month, sunrise is at 7:30 am and sunset at 4:29 pm. On the last day of December, sunrise is at 7:49 am and sunset at 4:37 pm PST.
Sunshine
The average sunshine in December is 4.4h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.Note: In December, the maximum UV index of 2 suggests these recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
West Linn, OR
- Average high temperature in December: 44.4°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (44.4°F).
- Average low temperature in December: 34.3°F
The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (34.3°F).
Average pressure in December
West Linn, OR
- 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 (30"Hg).
Average wind speed in December
West Linn, OR
- Average wind speed in December: 5.7mph
The windiest month (with the highest average wind speed) is January (6mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in December
West Linn, OR
- Average humidity in December: 83%
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (64%).
Average rainfall in December
West Linn, OR
- Average rainfall in December: 5.16"
The wettest month (with the highest rainfall) is December (5.16").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in December
West Linn, OR
- Average rainfall days in December: 19.2 days
The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is August (4 days).
Average snowfall in December
West Linn, OR
- Average snowfall in December: 0.51"
The month with the highest snowfall is February (1.5").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
West Linn, OR
- Average snowfall days in December: 0.9 days
The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
West Linn, OR
- Average daylight in December: 8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 4h and 24min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).
Average sunshine days in December
West Linn, OR
- Average sunshine days in December: 10.5 days
The month with the most sunshine days is July (26.2 days).
The month with the least sunshine days is February (8.1 days).
Average UV index in December
West Linn, OR
- 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
West Linn, OR
- Average cloud cover in December: 54
The month with the most cloud cover is February (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in December
West Linn, OR
- Average visibility in December: 5mi
The months with the highest visibility are July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April, May, June, November and December (5mi).
