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 is the coldest month of the year, registering average temperatures as high as 34.5°F (1.4°C) and as low as 23.7°F (-4.6°C).Humidity
December is the most humid month in Three Rivers, with an average relative humidity of 82%.Rainfall
In Three Rivers, in December, it is raining for 3.3 days, with typically 0.47" (12mm) of accumulated precipitation. Throughout the year, there are 42.7 rainfall days, and 4.8" (122mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall in Three Rivers. In Three Rivers, in December, snow falls for 7.4 days, with typically accumulated 2.36" (60mm) of snow. In Three Rivers, Oregon, during the entire year, snow falls for 40.2 days and aggregates up to 19.09" (485mm) of snow.Daylight
With an average of 9h and 0min of daylight, December has the shortest days of the year in Three Rivers.On the first day of December in Three Rivers, sunrise is at 7:20 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 4:38 pm PST.
Sunshine
With an average of 5.5h of sunshine, December has the least sunshine of the year.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.Note: In December, a daily maximum UV index of 2 leads to the following instructions:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Frequently asked questions
What is the coldest time of year in Three Rivers?
How cold is it in Three Rivers in December?
What is the most humid month in Three Rivers?
What is the average humidity in December in Three Rivers?
How much does it rain in Three Rivers in December?
How much does it snow in Three Rivers in December?
What is the month with the shortest days in Three Rivers?
How many hours of daylight does Three Rivers have in December?
When is the sunrise / sunset in December in Three Rivers?
What is the month with the least sunshine in Three Rivers?
How many hours of sunshine does Three Rivers have in December?
What are the months with the lowest UV index in Three Rivers?
What is the UV index reading in December in Three Rivers?
Average temperature in December
Three Rivers, OR
- Average high temperature in December: 34.5°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is December (34.5°F).
- Average low temperature in December: 23.7°F
The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is December (23.7°F).
Average pressure in December
Three Rivers, OR
- Average pressure in December: 30.16"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).
Average wind speed in December
Three Rivers, OR
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is March (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity in December
Three Rivers, OR
- Average humidity in December: 82%
The month with the highest relative humidity is December (82%).
The month with the lowest relative humidity is July (46%).
Average rainfall in December
Three Rivers, OR
- Average rainfall in December: 0.47"
The wettest month (with the highest rainfall) is February (0.71").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in December
Three Rivers, OR
- Average rainfall days in December: 3.3 days
The month with the highest number of rainy days is May (5.5 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in December
Three Rivers, OR
- Average snowfall in December: 2.36"
The month with the highest snowfall is February (4.61").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Three Rivers, OR
- Average snowfall days in December: 7.4 days
The month with the highest number of snowfall days is December (7.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Three Rivers, OR
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 5h and 3min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in December
Three Rivers, OR
- Average sunshine days in December: 23 days
The month with the most sunshine days is July (26.7 days).
The month with the least sunshine days is February (20.6 days).
Average UV index in December
Three Rivers, 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, November and December (UV index 2).
Average cloud cover in December
Three Rivers, OR
- Average cloud cover in December: 46
The month with the most cloud cover is December (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in December
Three Rivers, OR
- Average visibility in December: 5mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Three Rivers, Oregon, USA
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