December weather forecast
Polaris, MT

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Weather in December

The first month of the winter, December, is also a subzero cold month in Polaris, Montana, with temperature in the range of an average low of 10.6°F (-11.9°C) and an average high of 25.2°F (-3.8°C).

Temperature

In Polaris, the month of December registers the lowest temperatures, averaging 25.2°F (-3.8°C) at the peak and 10.6°F (-11.9°C) at the lowest.

Humidity

The average relative humidity in December is 85%.

Rainfall

In Polaris, during December, the rain falls for 8.9 days and regularly aggregates up to 0.63" (16mm) of precipitation. In Polaris, during the entire year, the rain falls for 126.7 days and collects up to 10.35" (263mm) of precipitation.

Snowfall

Months with snowfall are January through June, September through December. In Polaris, in December, during 14 snowfall days, 4.45" (113mm) of snow is typically accumulated. Throughout the year, there are 81.2 snowfall days, and 29.76" (756mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 8h and 48min of daylight.
On the first day of December, sunrise is at 7:52 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 8:11 am and sunset at 4:59 pm MST.

Sunshine

December has the least sunshine of the year, with an average of 6.1h of sunshine.

UV index

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Updated: Aug 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

With an average high-temperature of 25.2°F (-3.8°C) and an average low-temperature of 10.6°F (-11.9°C), December is the coldest month.

How cold is it in December?

An average high-temperature, in December, in Polaris, is 25.2°F (-3.8°C) and the average low-temperature is 10.6°F (-11.9°C).

What is the average humidity in December?

The average relative humidity in December in Polaris is 85%.

How many days does it rain in December?

In December, the rain falls for 8.9 days. Throughout December, 0.63" (16mm) of precipitation is accumulated.

How many days does it snow in December?

In Polaris, in December, snow falls for 14 days, with typically accumulated 4.45" (113mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 8h and 48min of daylight.

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

In Polaris, the average day length in December is 8h and 47min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:52 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 8:11 am and sunset at 4:59 pm MST.

What is the month with the least sunshine?

With an average of 6.1h of sunshine, December has the least sunshine of the year.

How long on average sun shines in December in Polaris?

The average sunshine duration in December is 6.1h.

How high is the UV index in December?

In Polaris, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Polaris, MT

Average temperature in December - Polaris, MT
  • Average high temperature in December: 25.2°F

The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is December (25.2°F).

  • Average low temperature in December: 10.6°F

The month with the highest average low temperature is July (47.5°F).
The coldest month (with the lowest average low temperature) is December (10.6°F).

Average pressure in December
Polaris, MT

Average pressure in December - Polaris, MT
  • 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
Polaris, MT

Average wind speed in December - Polaris, MT
  • Average wind speed in December: 6.5mph

The windiest month (with the highest average wind speed) is November (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Polaris, MT

Average humidity in December - Polaris, MT
  • Average humidity in December: 85%

The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are July and August (45%).

Average rainfall in December
Polaris, MT

Average rainfall in December - Polaris, MT
  • Average rainfall in December: 0.63"

The wettest month (with the highest rainfall) is June (1.5").
The driest month (with the least rainfall) is January (0.51").

Average rainfall days in December
Polaris, MT

Average rainfall days in December - Polaris, MT
  • Average rainfall days in December: 8.9 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (7.7 days).

Average snowfall in December
Polaris, MT

Average snowfall in December - Polaris, MT
  • Average snowfall in December: 4.45"

The month with the highest snowfall is February (5.51").
The months with the least snowfall are July and August (0").

Average snowfall days in December
Polaris, MT

Average snowfall days in December - Polaris, MT
  • Average snowfall days in December: 14 days

The month with the highest number of snowfall days is February (14.1 days).
The months with the least snowfall days are July and August (0 days).

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

Average daylight in December / Average sunshine in December - Polaris, MT
  • Average daylight in December: 8h and 5min

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: 6h and 1min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 6min).

Average sunshine days in December
Polaris, MT

Average sunshine days in December - Polaris, MT
  • Average sunshine days in December: 15.5 days

The month with the most sunshine days is July (18.2 days).
The month with the least sunshine days is April (10.1 days).

Average UV index in December
Polaris, MT

Average UV index in December - Polaris, MT
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is February (UV index 1).

Average cloud cover in December
Polaris, MT

Average cloud cover in December - Polaris, MT
  • Average cloud cover in December: 40

The month with the most cloud cover is February (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 13).

Average visibility in December
Polaris, MT

Average visibility in December - Polaris, MT
  • Average visibility in December: 5mi

The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).

Polaris, Montana, USA

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