December weather forecast and climate
Mosby, MT

Weather in December

December, the first month of the winter, in Mosby, is still a freezing cold month, with average temperature ranging between min 18.5°F (-7.5°C) and max 31.1°F (-0.5°C).

Temperature

December is the coldest month, with an average high-temperature of 31.1°F (-0.5°C) and an average low-temperature of 18.5°F (-7.5°C).

Humidity

In Mosby, the average relative humidity is 74%.

Rainfall

In Mosby, it is raining for 5.5 days, with typically 0.59" (15mm) of accumulated precipitation. Throughout the year, in Mosby, Montana, there are 114.3 rainfall days, and 12.13" (308mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. In Mosby, Montana, in December, snow falls for 9.6 days, with typically accumulated 2.72" (69mm) of snow. Throughout the year, in Mosby, there are 53.5 snowfall days, and 18.58" (472mm) of snow is accumulated.

Daylight

With an average of 8.6h of daylight, December has the shortest days of the year in Mosby, Montana.

Sunshine

February and December, with an average of 5.2h of sunshine, are months with the least sunshine in Mosby.

UV index

December is the month with the lowest UV index in Mosby, Montana, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health hazard from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 1 in December transform into the following instructions:
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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Mosby?

December is the coldest month, with an average high-temperature of 31.1°F (-0.5°C) and an average low-temperature of 18.5°F (-7.5°C).

What is the average humidity in December in Mosby?

In Mosby, the average relative humidity in December is 74%.

How much does it rain in Mosby in December?

In Mosby, Montana, in December, during 5.5 rainfall days, 0.59" (15mm) of precipitation is typically accumulated.

How many days does it snow in December in Mosby?

In December, it is snowing for 9.6 days. Throughout December, 2.72" (69mm) of snow is accumulated.

What is the month with the shortest days in Mosby?

The month with the shortest days is December, with an average of 8.6h of daylight.

What is the average length of the day in December in Mosby?

The average length of the day in December in Mosby is 8.6h.

What is the month with the least sunshine in Mosby?

February and December, with an average of 5.2h of sunshine, are months with the least sunshine in Mosby.

How long on average sun shines in December in Mosby?

In December, the average sunshine is 5.2h.

When is the lowest UV index in Mosby?

With an average maximum UV index of 1, December is the month with the lowest UV index.

What is the UV index reading in December in Mosby?

The average daily maximum UV index in December in Mosby is 1. A UV Index estimate of 2, and below, represents a low health threat from unsafe exposure to the Sun's UV rays.

Average temperature in December
Mosby, MT

Average temperature in December - Mosby, MT
  • Average high temperature in December: 31.1°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (31.1°F).

  • Average low temperature in December: 18.5°F

The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is February (18°F).

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Average pressure in December
Mosby, MT

Average pressure in December - Mosby, MT
  • Average pressure in December: 30.12"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.85").

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Average wind speed in December
Mosby, MT

Average wind speed in December - Mosby, MT
  • Average wind speed in December: 11mph

The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (8.5mph).

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Average humidity in December
Mosby, MT

Average humidity in December - Mosby, MT
  • Average humidity in December: 74%

The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (39%).

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Average rainfall in December
Mosby, MT

Average rainfall in December - Mosby, MT
  • Average rainfall in December: 0.59"

The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is January (0.55").

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Average rainfall days in December
Mosby, MT

Average rainfall days in December - Mosby, MT
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (4.6 days).

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Average snowfall in December
Mosby, MT

Average snowfall in December - Mosby, MT
  • Average snowfall in December: 2.72"

The month with the highest snowfall is February (3.78").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Mosby, MT

Average snowfall days in December - Mosby, MT
  • Average snowfall days in December: 9.6 days

The month with the highest number of snowfall days is February (11.1 days).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in December /
Average sunshine in December
Mosby, MT

Average daylight in December / Average sunshine in December - Mosby, MT
  • Average daylight in December: 8.6h

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in December: 5.2h

The month with the most sunshine is July (Average sunshine: 11.8h).
Months with the least sunshine are February and December (Average sunshine: 5.2).

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Average sunshine days in December
Mosby, MT

Average sunshine days in December - Mosby, MT
  • Average sunshine days in December: 17.8 days

The month with the most sunshine days is September (19.5 days).
The month with the least sunshine days is April (12.8 days).

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Average UV index in December
Mosby, MT

Average UV index in December - Mosby, MT
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).

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Average cloud cover in December
Mosby, MT

Average cloud cover in December - Mosby, MT
  • Average cloud cover in December: 45

The month with the most cloud cover is February (Cloud cover 47).
Months with the least cloud cover are July and August (Cloud cover 16).

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Average visibility in December
Mosby, MT

Average visibility in December - Mosby, MT
  • 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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