December weather forecast
Alta Sierra, CA

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Weather in December

The first month of the winter, December, is still a cool month in Alta Sierra, California, with an average temperature varying between 37.2°F (2.9°C) and 51.3°F (10.7°C).

Temperature

December, with an average high of 51.3°F (10.7°C) and a low of 37.2°F (2.9°C), signifies the coldest month of the year.

Humidity

In December, the average relative humidity in Alta Sierra is 68%.

Rainfall

In December, the rain falls for 10.7 days. Throughout December, 5.35" (136mm) of precipitation is accumulated. In Alta Sierra, during the entire year, the rain falls for 82 days and collects up to 33.11" (841mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall in Alta Sierra. In Alta Sierra, in December, during 0.5 snowfall days, 0.71" (18mm) of snow is typically accumulated. Throughout the year, there are 6.8 snowfall days, and 14.41" (366mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:41 pm. On the last day of December, in Alta Sierra, California, sunrise is at 7:23 am and sunset at 4:51 pm PST.

Sunshine

The average sunshine in December in Alta Sierra is 5.8h.

UV index

In December, the average daily maximum UV index in Alta Sierra is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, an average UV index of 3 transforms into the following instructions:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
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Frequently asked questions

What is the coldest time of year in Alta Sierra?

In Alta Sierra, December registers the lowest temperatures, averaging 51.3°F (10.7°C) at the peak and 37.2°F (2.9°C) at the lowest.

What are the temperatures in Alta Sierra in December?

In December, in Alta Sierra, the average high-temperature is 51.3°F (10.7°C), and the average low-temperature is 37.2°F (2.9°C). In September, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 82.4°F (28°C).

What is the average humidity in December in Alta Sierra?

In Alta Sierra, California, the average relative humidity in December is 68%.

How many days does it rain in December in Alta Sierra?

In Alta Sierra, in December, it is raining for 10.7 days, with typically 5.35" (136mm) of accumulated precipitation.

How many days does it snow in December in Alta Sierra?

In Alta Sierra, in December, during 0.5 snowfall days, 0.71" (18mm) of snow is typically accumulated.

What is the month with the shortest days in Alta Sierra?

With an average of 9h and 30min of daylight, December has the shortest days of the year in Alta Sierra, California.

How many hours of daylight does Alta Sierra have in December?

In Alta Sierra, California, the average day length in December is 9h and 28min.

When is the sunrise / sunset in December in Alta Sierra?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 4:41 pm. On the last day of the month, in Alta Sierra, California, sunrise is at 7:23 am and sunset at 4:51 pm PST.

How long on average sun shines in December in Alta Sierra?

In December, the average sunshine duration in Alta Sierra, California, is 5.8h.

What is the UV index intensity in December in Alta Sierra?

In Alta Sierra, the average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a medium health risk 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
Alta Sierra, CA

Average temperature in December - Alta Sierra, CA
  • Average high temperature in December: 51.3°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (51.3°F).

  • Average low temperature in December: 37.2°F

The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).

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Average pressure in December
Alta Sierra, CA

Average pressure in December - Alta Sierra, CA
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in December
Alta Sierra, CA

Average wind speed in December - Alta Sierra, CA
  • Average wind speed in December: 5.3mph

The windiest month (with the highest average wind speed) is February (6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in December
Alta Sierra, CA

Average humidity in December - Alta Sierra, CA
  • Average humidity in December: 68%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (37%).

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Average rainfall in December
Alta Sierra, CA

Average rainfall in December - Alta Sierra, CA
  • Average rainfall in December: 5.35"

The wettest month (with the highest rainfall) is March (6.57").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Alta Sierra, CA

Average rainfall days in December - Alta Sierra, CA
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is March (15.1 days).
The month with the least rainy days is July (1.1 days).

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Average snowfall in December
Alta Sierra, CA

Average snowfall in December - Alta Sierra, CA
  • Average snowfall in December: 0.71"

The month with the highest snowfall is February (6.42").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in December
Alta Sierra, CA

Average snowfall days in December - Alta Sierra, CA
  • Average snowfall days in December: 0.5 days

The month with the highest number of snowfall days is March (2.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Alta Sierra, CA

Average daylight in December / Average sunshine in December - Alta Sierra, CA
  • Average daylight in December: 9h and 3min

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 30min).

  • Average sunshine in December: 5h and 5min

The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).

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Average sunshine days in December
Alta Sierra, CA

Average sunshine days in December - Alta Sierra, CA
  • Average sunshine days in December: 19.1 days

The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (14.8 days).

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Average UV index in December
Alta Sierra, CA

Average UV index in December - Alta Sierra, CA
  • Average UV index in December: 3

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 2).

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Average cloud cover in December
Alta Sierra, CA

Average cloud cover in December - Alta Sierra, CA
  • Average cloud cover in December: 35

The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in December
Alta Sierra, CA

Average visibility in December - Alta Sierra, CA
  • 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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Alta Sierra, California, USA

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