December weather forecast
Mammoth Lakes, CA

Perfect water reflections of trees, rocks, and distant mountains in the clear water of Mammoth Lakes, California
Perfect water reflections of trees, rocks, and distant mountains in the clear water of Mammoth Lakes, California

Weather in December

December, the first month of the winter in Mammoth Lakes, is still a cold month, with an average temperature ranging between max 34.2°F (1.2°C) and min 15.4°F (-9.2°C).

Temperature

In Mammoth Lakes, the average high-temperature in December decreases from a frosty 44.4°F (6.9°C) in November to a wintry 34.2°F (1.2°C). In December, in Mammoth Lakes, the average low-temperature is 15.4°F (-9.2°C).

Humidity

In Mammoth Lakes, the average relative humidity in December is 71%.

Rainfall

In Mammoth Lakes, it is raining for 4.8 days, with typically 0.63" (16mm) of accumulated precipitation. Throughout the year, in Mammoth Lakes, there are 47.7 rainfall days, and 4.92" (125mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Mammoth Lakes, California, are January through June, September through December. In Mammoth Lakes, in December, during 9.5 snowfall days, 4.92" (125mm) of snow is typically accumulated. Throughout the year, in Mammoth Lakes, there are 60.8 snowfall days, and 28.58" (726mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Mammoth Lakes, with an average of 9h and 37min of daylight.
On the first day of December in Mammoth Lakes, sunrise is at 6:52 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 4:47 pm PST.

Sunshine

In December, the average sunshine in Mammoth Lakes, California, is 6.4h.

UV index

January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 2 in December transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
[Resources]

FAQ

What is the temperature in December in Mammoth Lakes?

In Mammoth Lakes, in December, the average high-temperature is 34.2°F (1.2°C), and the average low-temperature is 15.4°F (-9.2°C).

What is the average humidity in December in Mammoth Lakes?

The average relative humidity in December is 71%.

How many days does it rain in December in Mammoth Lakes?

In December, in Mammoth Lakes, California, the rain falls for 4.8 days. Throughout December, 0.63" (16mm) of precipitation is accumulated.

How much does it snow in Mammoth Lakes in December?

In December, in Mammoth Lakes, it is snowing for 9.5 days. Throughout December, 4.92" (125mm) of snow is accumulated.

What is the month with the shortest days in Mammoth Lakes?

The month with the shortest days in Mammoth Lakes, California, is December, with an average of 9h and 37min of daylight.

What is the average length of the day in December in Mammoth Lakes?

The average day length in December in Mammoth Lakes, California, is 9h and 37min.

What time are sunrise and sunset in December in Mammoth Lakes?

In December, on the first day of the month, sunrise is at 6:52 am and sunset at 4:37 pm. On the last day of the month, in Mammoth Lakes, California, sunrise is at 7:10 am and sunset at 4:47 pm PST.

How many hours of sunshine does Mammoth Lakes have in December?

The average sunshine duration in December in Mammoth Lakes, California, is 6.4h.

What is the month with the lowest UV index in Mammoth Lakes?

January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index in Mammoth Lakes, California.

How high is the UV index in December in Mammoth Lakes?

In December, the average daily maximum UV index in Mammoth Lakes, California, is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Mammoth Lakes, CA

Average temperature in December - Mammoth Lakes, CA
  • Average high temperature in December: 34.2°F

The warmest month (with the highest average high temperature) is July (73.4°F).
The month with the lowest average high temperature is February (34°F).

  • Average low temperature in December: 15.4°F

The month with the highest average low temperature is July (48.2°F).
The coldest month (with the lowest average low temperature) is February (14.9°F).

[Resources]

Average pressure in December
Mammoth Lakes, CA

Average pressure in December - Mammoth Lakes, CA
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

[Resources]

Average wind speed in December
Mammoth Lakes, CA

Average wind speed in December - Mammoth Lakes, CA
  • Average wind speed in December: 6.1mph

The windiest month (with the highest average wind speed) is March (6.9mph).
The calmest months (with the lowest average wind speed) are July and August (4.9mph).

[Resources]

Average humidity in December
Mammoth Lakes, CA

Average humidity in December - Mammoth Lakes, CA
  • Average humidity in December: 71%

The month with the highest relative humidity is February (76%).
The month with the lowest relative humidity is August (34%).

[Resources]

Average rainfall in December
Mammoth Lakes, CA

Average rainfall in December - Mammoth Lakes, CA
  • Average rainfall in December: 0.63"

The wettest month (with the highest rainfall) is February (0.94").
The driest months (with the least rainfall) are August and October (0.08").

[Resources]

Average rainfall days in December
Mammoth Lakes, CA

Average rainfall days in December - Mammoth Lakes, CA
  • Average rainfall days in December: 4.8 days

The month with the highest number of rainy days is April (6.3 days).
The month with the least rainy days is August (1.8 days).

[Resources]

Average snowfall in December
Mammoth Lakes, CA

Average snowfall in December - Mammoth Lakes, CA
  • Average snowfall in December: 4.92"

The month with the highest snowfall is February (5.67").
The months with the least snowfall are July and August (0").

[Resources]

Average snowfall days in December
Mammoth Lakes, CA

Average snowfall days in December - Mammoth Lakes, CA
  • Average snowfall days in December: 9.5 days

The month with the highest number of snowfall days is March (11.3 days).
The months with the least snowfall days are July and August (0 days).

[Resources]

Average daylight in December /
Average sunshine in December
Mammoth Lakes, CA

Average daylight in December / Average sunshine in December - Mammoth Lakes, CA
  • Average daylight in December: 9h and 37min

The month with the longest days is June (Average daylight: 14h and 44min).
The month with the shortest days is December (Average daylight: 9h and 37min).

  • Average sunshine in December: 6h and 24min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 18min).

[Resources]

Average sunshine days in December
Mammoth Lakes, CA

Average sunshine days in December - Mammoth Lakes, CA
  • Average sunshine days in December: 21.3 days

The month with the most sunshine days is October (27.3 days).
The month with the least sunshine days is March (18.2 days).

[Resources]

Average UV index in December
Mammoth Lakes, CA

Average UV index in December - Mammoth Lakes, CA
  • Average UV index in December: 2

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

[Resources]

Average cloud cover in December
Mammoth Lakes, CA

Average cloud cover in December - Mammoth Lakes, CA
  • Average cloud cover in December: 29

The month with the most cloud cover is March (Cloud cover 30).
The month with the least cloud cover is August (Cloud cover 7).

[Resources]

Average visibility in December
Mammoth Lakes, CA

Average visibility in December - Mammoth Lakes, 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).

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location