December weather forecastSunriver, OR
December
Weather in December
December, the first month of the winter in Sunriver, is also a wintry month, with temperature in the range of an average low of 24.6°F (-4.1°C) and an average high of 35.8°F (2.1°C).Temperature
December is the month when Sunriver experiences its coldest temperatures, averaging a high of 35.8°F (2.1°C) and a low of 24.6°F (-4.1°C).Humidity
With an average relative humidity of 82%, December is the most humid month.Rainfall
In December, the rain falls for 7.6 days. Throughout December, 1.18" (30mm) of precipitation is accumulated. Throughout the year, there are 107.1 rainfall days, and 12.17" (309mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. In Sunriver, in December, snow falls for 8.3 days, with typically accumulated 3.9" (99mm) of snow. In Sunriver, during the entire year, snow falls for 44.9 days and aggregates up to 24.57" (624mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 7:20 am and sunset at 4:29 pm. On the last day of December, sunrise is at 7:39 am and sunset at 4:38 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 5.4h of sunshine.UV index
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Sunriver. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.Note: A daily high UV index of 2 in December leads to these guidelines:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Opt for tightly woven and loose clothing to enhance protection from the Sun. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sunriver, OR
- Average high temperature in December: 35.8°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is December (35.8°F).
- Average low temperature in December: 24.6°F
The month with the highest average low temperature is August (52.2°F).
The coldest month (with the lowest average low temperature) is December (24.6°F).
Average pressure in December
Sunriver, OR
- Average pressure in December: 30.15"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).
Average wind speed in December
Sunriver, OR
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).
Average humidity in December
Sunriver, 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 (48%).
Average rainfall in December
Sunriver, OR
- Average rainfall in December: 1.18"
The wettest month (with the highest rainfall) is May (1.5").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in December
Sunriver, OR
- Average rainfall days in December: 7.6 days
The month with the highest number of rainy days is May (14 days).
The month with the least rainy days is July (4.8 days).
Average snowfall in December
Sunriver, OR
- Average snowfall in December: 3.9"
The month with the highest snowfall is February (6.65").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Sunriver, OR
- Average snowfall days in December: 8.3 days
The month with the highest number of snowfall days is March (9.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Sunriver, 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 24min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in December
Sunriver, OR
- Average sunshine days in December: 18.4 days
The month with the most sunshine days is July (23.6 days).
The month with the least sunshine days is April (12.8 days).
Average UV index in December
Sunriver, 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
Sunriver, OR
- Average cloud cover in December: 46
The month with the most cloud cover is December (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility in December
Sunriver, 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).
