December weather forecast
Sun Valley, NV

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Weather in December

December, the first month of the winter in Sun Valley, is still a cold month, with an average temperature ranging between max 37.8°F (3.2°C) and min 23.4°F (-4.8°C).

Temperature

In Sun Valley, the lowest average temperatures are observed in December, with a high of 37.8°F (3.2°C) and a low of 23.4°F (-4.8°C).

Humidity

The average relative humidity in December is 72%.

Rainfall

In December, the rain falls for 8.4 days. Throughout December, 1.3" (33mm) of precipitation is accumulated. In Sun Valley, during the entire year, the rain falls for 68 days and collects up to 8.07" (205mm) of precipitation.

Snowfall

Months with snowfall in Sun Valley are January through May, September through December. In Sun Valley, in December, snow falls for 7.8 days, with typically accumulated 5.04" (128mm) of snow. In Sun Valley, during the entire year, snow falls for 33.2 days and aggregates up to 23.62" (600mm) of snow.

Daylight

The month with the shortest days in Sun Valley is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:01 am and sunset at 4:35 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:45 pm PST.

Sunshine

With an average of 6.1h of sunshine, December has the least sunshine of the year.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. 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: In December, the maximum UV index of 2 suggests these recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
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Frequently asked questions

What are the coldest months in Sun Valley?

December is the coldest month of the year, registering average temperatures as high as 37.8°F (3.2°C) and as low as 23.4°F (-4.8°C).

How cold does it get in Sun Valley in December?

In December, in Sun Valley, the average high-temperature is 37.8°F (3.2°C), and the average low-temperature is 23.4°F (-4.8°C).

What is the average humidity in December in Sun Valley?

The average relative humidity in December in Sun Valley is 72%.

How many days does it rain in December in Sun Valley?

In Sun Valley, Nevada, in December, during 8.4 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

How much does it snow in Sun Valley in December?

In Sun Valley, Nevada, in December, snow falls for 7.8 days, with typically accumulated 5.04" (128mm) of snow.

What is the month with the shortest days in Sun Valley?

December has the shortest days of the year in Sun Valley, with an average of 9h and 24min of daylight.

What is the average length of the day in December in Sun Valley?

In Sun Valley, Nevada, the average day length in December is 9h and 26min.

When are sunrise and sunset in December in Sun Valley?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:45 pm PST.

What is the month with the least sunshine in Sun Valley?

The month with the least sunshine in Sun Valley is December, with an average of 6.1h of sunshine.

How long on average sun shines in December in Sun Valley?

In December, the average sunshine duration is 6.1h.

When is the lowest UV index in Sun Valley?

The months with the lowest UV index in Sun Valley are January, February, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Sun Valley?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to UV radiation.
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
Sun Valley, NV

Average temperature in December - Sun Valley, NV
  • Average high temperature in December: 37.8°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (37.8°F).

  • Average low temperature in December: 23.4°F

The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is December (23.4°F).

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Average pressure in December
Sun Valley, NV

Average pressure in December - Sun Valley, NV
  • Average pressure in December: 30.16"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in December
Sun Valley, NV

Average wind speed in December - Sun Valley, NV
  • Average wind speed in December: 5.3mph

The windiest month (with the highest average wind speed) is April (7.3mph).
The calmest month (with the lowest average wind speed) is January (4.9mph).

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Average humidity in December
Sun Valley, NV

Average humidity in December - Sun Valley, NV
  • Average humidity in December: 72%

The month with the highest relative humidity is January (73%).
The months with the lowest relative humidity are July and August (28%).

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Average rainfall in December
Sun Valley, NV

Average rainfall in December - Sun Valley, NV
  • Average rainfall in December: 1.3"

The wettest month (with the highest rainfall) is February (1.38").
The driest months (with the least rainfall) are July and August (0.08").

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Average rainfall days in December
Sun Valley, NV

Average rainfall days in December - Sun Valley, NV
  • Average rainfall days in December: 8.4 days

The month with the highest number of rainy days is March (11.2 days).
The month with the least rainy days is August (1.8 days).

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Average snowfall in December
Sun Valley, NV

Average snowfall in December - Sun Valley, NV
  • Average snowfall in December: 5.04"

The month with the highest snowfall is February (6.06").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Sun Valley, NV

Average snowfall days in December - Sun Valley, NV
  • Average snowfall days in December: 7.8 days

The month with the highest number of snowfall days is December (7.8 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
Sun Valley, NV

Average daylight in December / Average sunshine in December - Sun Valley, NV
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 6h and 1min

The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 6min).

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Average sunshine days in December
Sun Valley, NV

Average sunshine days in December - Sun Valley, NV
  • Average sunshine days in December: 18.4 days

The month with the most sunshine days is August (28.2 days).
The month with the least sunshine days is March (15.9 days).

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Average UV index in December
Sun Valley, NV

Average UV index in December - Sun Valley, NV
  • Average UV index in December: 2

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Sun Valley, NV

Average cloud cover in December - Sun Valley, NV
  • Average cloud cover in December: 33

The month with the most cloud cover is December (Cloud cover 33).
The months with the least cloud cover are July and August (Cloud cover 7).

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Average visibility in December
Sun Valley, NV

Average visibility in December - Sun Valley, NV
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Sun Valley, Nevada, USA

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