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
In Three Rivers, Oregon, December records the lowest average temperatures, peaking at 34.5°F (1.4°C) and reaching a low of 23.7°F (-4.6°C).Humidity
The most humid month is December, with an average relative humidity of 82%.Rainfall
In Three Rivers, Oregon, 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 December, snow falls for 7.4 days, with typically accumulated 2.36" (60mm) of snow. Throughout the year, there are 40.2 snowfall days, and 19.09" (485mm) of snow is accumulated.Daylight
The month with the shortest days in Three Rivers is December, with an average of 9h and 0min of daylight.On the first day of December, 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
December has the least sunshine of the year, with an average of 5.5h of sunshine.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 of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 2 suggests this advice:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
How cold is it in December?
What is the most humid month?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days in Three Rivers?
What is the average length of the day in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How long on average sun shines in December?
What are the months with the lowest UV index?
What is the UV index intensity in December?
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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