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
Temperature records mark December as the coldest month, with highs averaging 34.5°F (1.4°C) and lows at 22.3°F (-5.4°C).Humidity
The months with the highest humidity are January, February and December, with an average relative humidity of 84%.Rainfall
In Weston, during December, the rain falls for 8.5 days and regularly aggregates up to 3.19" (81mm) of precipitation. In Weston, Oregon, during the entire year, the rain falls for 127.6 days and collects up to 24.33" (618mm) of precipitation.Snowfall
Months with snowfall are January through May, September through December. In Weston, during December, snow falls for 17.7 days and regularly aggregates up to 15.87" (403mm) of snow. Throughout the year, there are 84.8 snowfall days, and 74.33" (1888mm) of snow is accumulated.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 7:15 am and sunset at 4:10 pm. On the last day of December, sunrise is at 7:34 am and sunset at 4:19 pm PST.
Sunshine
The months with the least sunshine are January and December, with an average of 4.6h of sunshine.UV index
January through April, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
How cold is it in December?
What are the most humid months?
What is the average humidity in December?
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 Weston have in December?
When are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Weston have in December?
When is the lowest UV index?
How high is the UV index in December?
Average temperature in December
Weston, OR
- Average high temperature in December: 34.5°F
The warmest month (with the highest average high temperature) is August (80.6°F).
The month with the lowest average high temperature is December (34.5°F).
- Average low temperature in December: 22.3°F
The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is December (22.3°F).
Average pressure in December
Weston, OR
- Average pressure in December: 30.18"Hg
The month with the highest atmospheric pressure is January (30.21"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in December
Weston, OR
- Average wind speed in December: 6.1mph
The windiest month (with the highest average wind speed) is March (6.7mph).
The calmest month (with the lowest average wind speed) is September (4.9mph).
Average humidity in December
Weston, OR
- Average humidity in December: 84%
The months with the highest relative humidity are January, February and December (84%).
The month with the lowest relative humidity is August (44%).
Average rainfall in December
Weston, OR
- Average rainfall in December: 3.19"
The wettest month (with the highest rainfall) is February (3.23").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in December
Weston, OR
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is March (15.9 days).
The month with the least rainy days is August (4.8 days).
Average snowfall in December
Weston, OR
- Average snowfall in December: 15.87"
The month with the highest snowfall is February (19.21").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Weston, OR
- Average snowfall days in December: 17.7 days
The month with the highest number of snowfall days is December (17.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Weston, OR
- Average daylight in December: 8h and 4min
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: 4h and 4min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 4h and 36min).
Average sunshine days in December
Weston, OR
- Average sunshine days in December: 11.9 days
The month with the most sunshine days is July (24.5 days).
The months with the least sunshine days are February and March (8.2 days).
Average UV index in December
Weston, 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, March, April, November and December (UV index 2).
Average cloud cover in December
Weston, OR
- Average cloud cover in December: 53
The month with the most cloud cover is February (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility in December
Weston, OR
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
Weston, Oregon, USA
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