December weather forecastMammoth, WY
December
Weather in December
December, the first month of the winter in Mammoth, is also a subzero cold month, with an average temperature ranging between max 20.1°F (-6.6°C) and min 4.8°F (-15.1°C).Temperature
With average high and low temperatures of 20.1°F (-6.6°C) and 4.8°F (-15.1°C) respectively, December is Mammoth's coldest month.Humidity
In December, the average relative humidity in Mammoth is 93%.Rainfall
In Mammoth, in December, it is raining for 4 days, with typically 1.97" (50mm) of accumulated precipitation. Throughout the year, there are 109.2 rainfall days, and 23.15" (588mm) of precipitation is accumulated.Snowfall
Months with snowfall in Mammoth, Wyoming, are January through July, September through December. In Mammoth, in December, snow falls for 23.5 days, with typically accumulated 16.38" (416mm) of snow. In Mammoth, during the entire year, snow falls for 159.3 days and aggregates up to 120.47" (3060mm) of snow.Daylight
The month with the shortest days in Mammoth, Wyoming, is December, with an average of 8h and 48min of daylight.On the first day of the month, sunrise is at 7:41 am and sunset at 4:42 pm. On the last day of December, sunrise is at 8:00 am and sunset at 4:51 pm MST.
Sunshine
January, February and December, with an average of 3.3h of sunshine, are months with the least sunshine in Mammoth.UV index
January through April, October through December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: During December, 1 as the daily maximum UV index converts into the following advice:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Stay sun-safe with clothing that is both closely woven and worn loosely. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mammoth, WY
- Average high temperature in December: 20.1°F
The warmest month (with the highest average high temperature) is July (72.9°F).
The month with the lowest average high temperature is December (20.1°F).
- Average low temperature in December: 4.8°F
The month with the highest average low temperature is August (43.7°F).
The coldest month (with the lowest average low temperature) is December (4.8°F).
Average pressure in December
Mammoth, WY
- Average pressure in December: 30.23"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Mammoth, WY
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is June (6.8mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).
Average humidity in December
Mammoth, WY
- Average humidity in December: 93%
The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is August (50%).
Average rainfall in December
Mammoth, WY
- Average rainfall in December: 1.97"
The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is July (0.91").
Average rainfall days in December
Mammoth, WY
- Average rainfall days in December: 4 days
The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (2.2 days).
Average snowfall in December
Mammoth, WY
- Average snowfall in December: 16.38"
The month with the highest snowfall is February (17.83").
The month with the least snowfall is August (0").
Average snowfall days in December
Mammoth, WY
- Average snowfall days in December: 23.5 days
The month with the highest number of snowfall days is March (24.4 days).
The months with the least snowfall days are July and August (0.2 days).
Average daylight in December /
Average sunshine in December
Mammoth, WY
- Average daylight in December: 8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 3h and 18min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 18min).
Average sunshine days in December
Mammoth, WY
- Average sunshine days in December: 8.2 days
The months with the most sunshine days are July and September (14.7 days).
The month with the least sunshine days is February (5.3 days).
Average UV index in December
Mammoth, WY
- Average UV index in December: 1
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).
Average cloud cover in December
Mammoth, WY
- Average cloud cover in December: 72
The month with the most cloud cover is February (Cloud cover 76).
The month with the least cloud cover is July (Cloud cover 16).
Average visibility in December
Mammoth, WY
- Average visibility in December: 3mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (3mi).
