December weather forecastBeaverton, OR
December
Weather in December
December announces the arrival of winter with a significant drop in average temperatures, down to 34.7°F (1.5°C). The city experiences the highest precipitation of the year, at 4.61" (117mm), carrying a hint of snow. The long nights curtailing daylight to a mere 8.8 hours, matched with 58% cloud cover, adds to the winter ambiance. Owing to the weather, Beaverton in December wraps itself in festive spirit under a chilly blanket.Temperature
December, marked by an average high-temperature of 44.2°F (6.8°C) and a low-temperature of 34.7°F (1.5°C), is the coldest month.Humidity
February and December, with an average relative humidity of 84%, are the most humid months.Rainfall
December is the month with the most rainfall. Rain falls for 18.7 days and accumulates 4.61" (117mm) of precipitation.Snowfall
January through March, November and December are months with snowfall. In Beaverton, during December, snow falls for 0.8 days and regularly aggregates up to 0.43" (11mm) of snow. In Beaverton, during the entire year, snow falls for 6.1 days and aggregates up to 4.37" (111mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 48min of daylight.On the first day of December, sunrise is at 7:31 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:51 am and sunset at 4:38 pm PST.
Sunshine
In Beaverton, the average sunshine in December is 4.1h.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 unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 2 in December converts into the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. 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
Beaverton, OR
- Average high temperature in December: 44.2°F
The warmest month (with the highest average high temperature) is August (81.7°F).
The month with the lowest average high temperature is December (44.2°F).
- Average low temperature in December: 34.7°F
The month with the highest average low temperature is August (55.6°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).
Average pressure in December
Beaverton, 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
Beaverton, OR
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is January (5.4mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in December
Beaverton, OR
- Average humidity in December: 84%
The months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is August (63%).
Average rainfall in December
Beaverton, OR
- Average rainfall in December: 4.61"
The wettest month (with the highest rainfall) is December (4.61").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in December
Beaverton, OR
- Average rainfall days in December: 18.7 days
The month with the highest number of rainy days is March (20.6 days).
The month with the least rainy days is August (4.6 days).
Average snowfall in December
Beaverton, OR
- Average snowfall in December: 0.43"
The month with the highest snowfall is February (1.61").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Beaverton, OR
- Average snowfall days in December: 0.8 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 daylight in December /
Average sunshine in December
Beaverton, 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 6min
The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in December
Beaverton, OR
- Average sunshine days in December: 10.3 days
The month with the most sunshine days is July (24.9 days).
The month with the least sunshine days is March (8.6 days).
Average UV index in December
Beaverton, 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
Beaverton, OR
- Average cloud cover in December: 58
The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in December
Beaverton, OR
- Average visibility in December: 5mi
The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).
