Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December is characterized by a reduction in the average high-temperature, from a frosty 44.4°F (6.9°C) in November to a wintry 34.2°F (1.2°C). Nighttime temperature lowers to an average of 15.4°F (-9.2°C) in December.Humidity
In December, the average relative humidity is 71%.Rainfall
In Mammoth Lakes, in December, it is raining for 4.8 days, with typically 0.63" (16mm) of accumulated precipitation. Throughout the year, there are 47.7 rainfall days, and 4.92" (125mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. In Mammoth Lakes, in December, during 9.5 snowfall days, 4.92" (125mm) of snow is typically accumulated. In Mammoth Lakes, during the entire year, snow falls for 60.8 days and aggregates up to 28.58" (726mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 6:52 am and sunset at 4:37 pm. On the last day of December, in Mammoth Lakes, sunrise is at 7:10 am and sunset at 4:47 pm PST.
Sunshine
The average sunshine in December 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 of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the average person.Note: The daily maximum UV index of 2 in December interprets into the following advice:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
How many hours of daylight does Mammoth Lakes have in December?
What time are sunrise and sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index reading in December?
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in December /
Average sunshine in December
Mammoth Lakes, CA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 6h and 2min
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).
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).
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).
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).
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).
Mammoth Lakes, California, USA
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