Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December, marked by an average high-temperature of 40.6°F (4.8°C) and a low-temperature of 30.7°F (-0.7°C), is the coldest month.Humidity
The average relative humidity in December is 85%.Rainfall
December is the month with the most rainfall. Rain falls for 18.5 days and accumulates 6.42" (163mm) of precipitation.Snowfall
January through May, November and December are months with snowfall in Brightwood. In Brightwood, during December, snow falls for 7.1 days and regularly aggregates up to 4.53" (115mm) of snow. In Brightwood, during the entire year, snow falls for 31.6 days and aggregates up to 33.86" (860mm) of snow.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year in Brightwood.On the first day of December, sunrise is at 7:28 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:47 am and sunset at 4:35 pm PST.
Sunshine
In December, the average sunshine is 4.1h.UV index
The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 2 during December translates into the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year in Brightwood?
Is December cold?
What is the average humidity in December?
What is the rainiest month?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Brightwood have in December?
When are sunrise and sunset in December?
How long on average sun shines in December in Brightwood?
How high is the UV index in December?
Average temperature in December
Brightwood, OR
- Average high temperature in December: 40.6°F
The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is December (40.6°F).
- Average low temperature in December: 30.7°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 (30.7°F).
Average pressure in December
Brightwood, OR
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).
Average wind speed in December
Brightwood, OR
- Average wind speed in December: 6.3mph
The windiest month (with the highest average wind speed) is January (6.7mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in December
Brightwood, OR
- Average humidity in December: 85%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (66%).
Average rainfall in December
Brightwood, OR
- Average rainfall in December: 6.42"
The wettest month (with the highest rainfall) is December (6.42").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Brightwood, OR
- Average rainfall days in December: 18.5 days
The month with the highest number of rainy days is March (20.5 days).
The month with the least rainy days is July (6 days).
Average snowfall in December
Brightwood, OR
- Average snowfall in December: 4.53"
The month with the highest snowfall is February (11.69").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Brightwood, OR
- Average snowfall days in December: 7.1 days
The month with the highest number of snowfall days is February (8.5 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Brightwood, OR
- Average daylight in December: 8h and 5min
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 1min
The month with the most sunshine is August (Average sunshine: 11h and 12min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in December
Brightwood, OR
- Average sunshine days in December: 9.8 days
The month with the most sunshine days is July (22.9 days).
The month with the least sunshine days is February (7.3 days).
Average UV index in December
Brightwood, OR
- 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
Brightwood, OR
- Average cloud cover in December: 56
The months with the most cloud cover are February and March (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in December
Brightwood, OR
- Average visibility in December: 5mi
The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, September, October, November and December (5mi).
Brightwood, Oregon, USA
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