December weather forecast
Sunriver, OR

Weather in December

The first month of the winter, December, is still a cold month in Sunriver, Oregon, with an average temperature ranging between min 24.6°F (-4.1°C) and max 35.8°F (2.1°C).

Temperature

December is the coldest month, with an average high-temperature of 35.8°F (2.1°C) and an average low-temperature of 24.6°F (-4.1°C).

Humidity

December is the most humid month in Sunriver, with an average relative humidity of 82%.

Rainfall

In Sunriver, Oregon, during 7.6 rainfall days, 1.18" (30mm) of precipitation is typically 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, during December, snow falls for 8.3 days and regularly aggregates up to 3.9" (99mm) of snow. Throughout the year, there are 44.9 snowfall days, and 24.57" (624mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 8h and 58min of daylight.
On the first day of December in Sunriver, 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 4:37 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 5.4h 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 estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Sunriver?

With an average high-temperature of 35.8°F (2.1°C) and an average low-temperature of 24.6°F (-4.1°C), December is the coldest month in Sunriver.

What is the temperature in December in Sunriver?

In Sunriver, Oregon, in December, the average high-temperature is 35.8°F (2.1°C), and the average low-temperature is 24.6°F (-4.1°C).

What is the most humid month in Sunriver?

The most humid month is December, with an average relative humidity of 82%.

What is the average humidity in December in Sunriver?

The average relative humidity in December is 82%.

How much does it rain in Sunriver in December?

In December, in Sunriver, Oregon, the rain falls for 7.6 days. Throughout December, 1.18" (30mm) of precipitation is accumulated.

How much does it snow in Sunriver in December?

In Sunriver, Oregon, in December, during 8.3 snowfall days, 3.9" (99mm) of snow is typically accumulated.

What is the month with the shortest days in Sunriver?

December has the shortest days of the year in Sunriver, Oregon, with an average of 8h and 58min of daylight.

What is the average length of the day in December in Sunriver?

The average day length in December in Sunriver is 8h and 58min.

What time are sunrise and sunset in December in Sunriver?

In December, on the first day of the month, sunrise is at 7:20 am and sunset at 4:29 pm. On the last day of the month, in Sunriver, sunrise is at 7:39 am and sunset at 4:37 pm PST.

What is the month with the least sunshine in Sunriver?

December has the least sunshine of the year, with an average of 5.4h of sunshine.

How long on average sun shines in December in Sunriver?

In Sunriver, Oregon, the average sunshine duration in December is 5.4h.

What are the months with the lowest UV index in Sunriver?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Sunriver, Oregon.

What is the UV index reading in December in Sunriver?

In Sunriver, Oregon, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Sunriver, OR

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).

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Average pressure in December
Sunriver, OR

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).

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Average wind speed in December
Sunriver, OR

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).

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Average humidity in December
Sunriver, OR

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%).

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Average rainfall in December
Sunriver, OR

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").

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Average rainfall days in December
Sunriver, OR

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).

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Average snowfall in December
Sunriver, OR

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").

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Average snowfall days in December
Sunriver, OR

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).

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Average daylight in December /
Average sunshine in December
Sunriver, OR

Average daylight in December / Average sunshine in December - Sunriver, OR
  • Average daylight in December: 8h and 58min

The month with the longest days is June (Average daylight: 15h and 25min).
The month with the shortest days is December (Average daylight: 8h and 58min).

  • 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).

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Average sunshine days in December
Sunriver, OR

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).

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Average UV index in December
Sunriver, OR

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).

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Average cloud cover in December
Sunriver, OR

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).

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Average visibility in December
Sunriver, OR

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).

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