December weather forecast and climate
Mountain Pass, CA

Weather in December

The first month of the winter, December, is still a cool month in Mountain Pass, California, with average temperature varying between 38.8°F (3.8°C) and 50.9°F (10.5°C).

Temperature

December is the coldest month, with an average high-temperature of 50.9°F (10.5°C) and an average low-temperature of 38.8°F (3.8°C).

Humidity

In December, the average relative humidity in Mountain Pass is 46%.

Rainfall

In Mountain Pass, it is raining for 3.9 days, with typically 0.31" (8mm) of accumulated precipitation. Throughout the year, in Mountain Pass, there are 42.9 rainfall days, and 3.23" (82mm) of precipitation is accumulated.

Snowfall

January, March through December are months without snowfall.

Daylight

The month with the shortest days is December, with an average of 9.8h of daylight.

Sunshine

December has the least sunshine of the year, with an average of 7h of sunshine.

UV index

With an average maximum UV index of 2, December is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the coldest month in Mountain Pass?

December is the coldest month, with an average high-temperature of 50.9°F (10.5°C) and an average low-temperature of 38.8°F (3.8°C).

What is the temperature in December in Mountain Pass?

The average high-temperature, in December, in Mountain Pass, California, is 50.9°F (10.5°C), while the average low-temperature is 38.8°F (3.8°C).

What is the average humidity in December in Mountain Pass?

The average relative humidity in December in Mountain Pass, California, is 46%.

How much does it rain in Mountain Pass in December?

In Mountain Pass, California, during December, the rain falls for 3.9 days and regularly aggregates up to 0.31" (8mm) of precipitation.

When it does not snow in Mountain Pass?

In Mountain Pass, California, snow does not fall in January, March through December.

What is the month with the shortest days in Mountain Pass?

December has the shortest days of the year in Mountain Pass, California, with an average of 9.8h of daylight.

What is the average length of the day in December in Mountain Pass?

In December, the average length of the day is 9.8h.

What is the month with the least sunshine in Mountain Pass?

The month with the least sunshine in Mountain Pass, California, is December, with an average of 7h of sunshine.

How many hours of sunshine does Mountain Pass have in December?

In Mountain Pass, California, the average sunshine in December is 7h.

When is the lowest UV index in Mountain Pass?

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

What is the UV index intensity in December in Mountain Pass?

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to the UV radiation.

Average temperature in December
Mountain Pass, CA

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

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).

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Average pressure in December
Mountain Pass, CA

Average pressure in December - Mountain Pass, CA
  • Average pressure in December: 30.1"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.76").

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Average wind speed in December
Mountain Pass, CA

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).

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Average humidity in December
Mountain Pass, CA

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%).

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Average rainfall in December
Mountain Pass, CA

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").

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Average rainfall days in December
Mountain Pass, CA

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).

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Average snowfall in December
Mountain Pass, CA

Average snowfall in December - Mountain Pass, CA
  • Average snowfall in December: 0"

The month with the highest snowfall is February (0.24").
Months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in December
Mountain Pass, CA

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).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in December /
Average sunshine in December
Mountain Pass, CA

Average daylight in December / Average sunshine in December - Mountain Pass, CA
  • Average daylight in December: 9.8h

The month with the longest days is June (Average daylight: 14.5h).
The month with the shortest days is December (Average daylight: 9.8h).

  • Average sunshine in December: 7h

The month with the most sunshine is August (Average sunshine: 12.2h).
The month with the least sunshine is December (Average sunshine: 7h).

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Average sunshine days in December
Mountain Pass, CA

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).

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Average UV index in December
Mountain Pass, CA

Average UV index in December - Mountain Pass, CA
  • Average UV index in December: 2

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).

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Average cloud cover in December
Mountain Pass, CA

Average cloud cover in December - Mountain Pass, CA
  • Average cloud cover in December: 19

Months with the most cloud cover are January and December (Cloud cover 19).
Months with the least cloud cover are June and August (Cloud cover 6).

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Average visibility in December
Mountain Pass, CA

Average visibility in December - Mountain Pass, CA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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