Mammoth Lakes
California, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Mammoth Lakes, CA

The ever-scenic and perfect water reflections in the clear water of trees, rocks, and distant mountains in Mammoth Lakes, California
The ever-scenic and perfect water reflections in the clear water of trees, rocks, and distant mountains in Mammoth Lakes, California
The first month of the winter, December, is still a cold month in Mammoth Lakes, California, with average temperature ranging between min 16.5°F (-8.6°C) and max 41.2°F (5.1°C).

Temperature

In Mammoth Lakes, the average high-temperature slightly decreases, from a chilly 47.5°F (8.6°C) in November, to a cold 41.2°F (5.1°C). In Mammoth Lakes, in December, the average low-temperature is 16.5°F (-8.6°C).

Rainfall

In Mammoth Lakes, during December, the rain falls for 8 days and regularly aggregates up to 4.1" (104.9mm) of precipitation. In Mammoth Lakes, during the entire year, the rain falls for 63 days and collects up to 23" (583.3mm) of precipitation.

Snowfall

January through June, October through December are months with snowfall in Mammoth Lakes. The month with the most snowfall is December when 45.3" (1150.6mm) of snow is typically aggregated.

Daylight

The month with the shortest days in Mammoth Lakes is December, with an average of 9.6h of daylight.

Sunshine

With an average of 6h of sunshine, December has the least sunshine of the year.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to the UV radiation for the ordinary person.
The daily maximum UV index of 2 interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Mammoth Lakes?

In December, in Mammoth Lakes, the average high-temperature is 41.2°F (5.1°C), and the average low-temperature is 16.5°F (-8.6°C).

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

In December, the rain falls for 8 days. Throughout December, 4.1" (104.9mm) of precipitation is accumulated.

How much does it snow in Mammoth Lakes in December?

During December, Mammoth Lakes regularly aggregates up to 45.3" (1150.6mm) of snow.

When does it snow the most in Mammoth Lakes?

December is the month with the most snowfall, with 45.3" (1150.6mm) of accumulated snow.

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

With an average of 9.6h of daylight, December has the shortest days of the year in Mammoth Lakes.

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

In Mammoth Lakes, California, the average length of the day in December is 9.6h.

What is the month with the least sunshine in Mammoth Lakes?

December has the least sunshine of the year, with an average of 6h of sunshine.

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

In December, the average sunshine in Mammoth Lakes is 6h.

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

December is the month with the lowest UV index in Mammoth Lakes, with an average maximum UV index of 2.

What is the UV index intensity in December in Mammoth Lakes?

In December, the average daily maximum UV index in Mammoth Lakes is 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to the UV radiation.
Average temperature in December - Mammoth Lakes, CA
  • Average high temperature in December: 41.1°F

The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in December: 16.5°F

The month with the highest average low temperature is July (45.3°F).
The coldest month (with the lowest average low temperature) is January (14.8°F).

Average rainfall in December - Mammoth Lakes, CA
  • Average rainfall in December: 4.1"

The wettest month (with the highest rainfall) is January (4.6").
The driest month (with the lowest rainfall) is August (0.3").

Average rainfall days in December - Mammoth Lakes, CA
  • Average rainfall days in December: 8 days

Months with the highest number of rainy days are January and February (9 days).
Months with the lowest number of rainy days are August and September (2 days).

Average snowfall in December - Mammoth Lakes, CA
  • Average snowfall in December: 45.3"

The month with the highest snowfall is December (45.3").
Months with the lowest snowfall are July, August and September (0").

Average daylight in December / Average sunshine in December - Mammoth Lakes, CA
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 6h

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

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

Months with the highest UV index are June and July (UV index 11).
The month with the lowest UV index is December (UV index 2).