December weather forecastMountain Pass, CA
December
Weather in December
December, the first month of the winter in Mountain Pass, is still a cool month, with temperature in the range of an average high of 50.9°F (10.5°C) and an average low of 38.8°F (3.8°C).Temperature
December, with its average high-temperature of 50.9°F (10.5°C) and an average low-temperature of 38.8°F (3.8°C), holds the record as the coldest month.Humidity
In December, the average relative humidity is 46%.Rainfall
In Mountain Pass, in December, during 3.9 rainfall days, 0.31" (8mm) of precipitation is typically accumulated. Throughout the year, there are 42.9 rainfall days, and 3.23" (82mm) of precipitation is accumulated.Snowfall
January, March through December are months without snowfall.Daylight
With an average of 9h and 48min of daylight, December has the shortest days of the year in Mountain Pass, California.On the first day of December, sunrise is at 6:33 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 4:39 pm PST.
Sunshine
The month with the least sunshine is December, with an average of 7h of sunshine.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 low threat to health from exposure to the Sun's UV radiation for the average person.Note: In December, the maximum UV index of 2 translates into these guidelines:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mountain Pass, CA
- Average high temperature in December: 50.9°F
The warmest month (with the highest average high temperature) is July (98.4°F).
The month with the lowest average high temperature is December (50.9°F).
- Average low temperature in December: 38.8°F
The months with the highest average low temperature are July and August (78.4°F).
The coldest month (with the lowest average low temperature) is December (38.8°F).
Average pressure in December
Mountain Pass, CA
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.76"Hg).
Average wind speed in December
Mountain Pass, CA
- Average wind speed in December: 5.7mph
The windiest month (with the highest average wind speed) is April (8.8mph).
The calmest month (with the lowest average wind speed) is January (5.4mph).
Average humidity in December
Mountain Pass, CA
- Average humidity in December: 46%
The month with the highest relative humidity is January (47%).
The month with the lowest relative humidity is June (15%).
Average rainfall in December
Mountain Pass, CA
- Average rainfall in December: 0.31"
The wettest months (with the highest rainfall) are July and August (0.55").
The driest month (with the least rainfall) is June (0.04").
Average rainfall days in December
Mountain Pass, CA
- Average rainfall days in December: 3.9 days
The month with the highest number of rainy days is July (6.1 days).
The month with the least rainy days is June (0.9 days).
Average snowfall in December
Mountain Pass, CA
- Average snowfall in December: 0"
The month with the highest snowfall is February (0.24").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in December
Mountain Pass, CA
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
Mountain Pass, CA
- Average daylight in December: 9h and 48min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in December: 7h and 0min
The month with the most sunshine is August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 0min).
Average sunshine days in December
Mountain Pass, CA
- Average sunshine days in December: 25.6 days
The month with the most sunshine days is June (27.6 days).
The month with the least sunshine days is July (18.7 days).
Average UV index in December
Mountain Pass, CA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in December
Mountain Pass, CA
- Average cloud cover in December: 19
The months with the most cloud cover are January and December (Cloud cover 19).
The months with the least cloud cover are June and August (Cloud cover 6).
Average visibility in December
Mountain Pass, 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).
