December weather forecastCorvallis, OR
December
Weather in December
Winter descends in full force on Corvallis, Oregon in December. Cold temperatures combined with limited sunshine and shorter daylight hours create chilly conditions, perfect for indoor activities and cozy fireplaces. Rainfall reaches its peak for the year, contributing to the damp, colder climate. Resurfacing from November, snowfall increases slightly to 0.24" (6mm), adding a touch of winter magic to the landscape. The end of the year is shrouded in more cloud covers than previous months, concluding the weather cycle in a cozy, wintry fold.Temperature
The coldest time of the year is December, with temperatures averaging a high of 44.8°F (7.1°C) and a low of 34.2°F (1.2°C).Humidity
December is the most humid month, with an average relative humidity of 89%.Rainfall
The month with the most rainfall is December, when the rain falls for 19.1 days and typically aggregates up to 4.8" (122mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In Corvallis, in December, snow falls for 0.5 days, with typically accumulated 0.24" (6mm) of snow. Throughout the year, there are 4.6 snowfall days, and 3.27" (83mm) of snow is accumulated.Daylight
December has the shortest days of the year in Corvallis, with an average of 8h and 54min of daylight.On the first day of December, sunrise is at 7:30 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:43 pm PST.
Sunshine
The average sunshine in December is 3.9h.UV index
The months with the lowest UV index in Corvallis are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum UV index, 2 during December, leads to the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be on the lookout! Nearly twofold UV radiation 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
Corvallis, OR
- Average high temperature in December: 44.8°F
The warmest month (with the highest average high temperature) is August (80.4°F).
The month with the lowest average high temperature is December (44.8°F).
- Average low temperature in December: 34.2°F
The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).
Average pressure in December
Corvallis, OR
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in December
Corvallis, OR
- Average wind speed in December: 4.6mph
The windiest month (with the highest average wind speed) is March (4.9mph).
The calmest month (with the lowest average wind speed) is September (3.9mph).
Average humidity in December
Corvallis, OR
- Average humidity in December: 89%
The month with the highest relative humidity is December (89%).
The month with the lowest relative humidity is August (69%).
Average rainfall in December
Corvallis, OR
- Average rainfall in December: 4.8"
The wettest month (with the highest rainfall) is December (4.8").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in December
Corvallis, OR
- Average rainfall days in December: 19.1 days
The month with the highest number of rainy days is March (20.9 days).
The month with the least rainy days is August (4.5 days).
Average snowfall in December
Corvallis, OR
- Average snowfall in December: 0.24"
The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Corvallis, OR
- Average snowfall days in December: 0.5 days
The month with the highest number of snowfall days is February (1.8 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
Corvallis, OR
- Average daylight in December: 8h and 54min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in December: 3h and 54min
The months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 36min).
Average sunshine days in December
Corvallis, OR
- Average sunshine days in December: 10.2 days
The month with the most sunshine days is July (24.3 days).
The month with the least sunshine days is February (8.4 days).
Average UV index in December
Corvallis, OR
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Corvallis, OR
- Average cloud cover in December: 61
The month with the most cloud cover is February (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in December
Corvallis, OR
- Average visibility in December: 4mi
The months with the highest visibility are June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, May, November and December (4mi).
