December weather forecast
Perma, MT

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Weather in December

The first month of the winter, December, is still a freezing cold month in Perma, Montana, with an average temperature fluctuating between 16.7°F (-8.5°C) and 28.4°F (-2°C).

Temperature

Perma's coldest temperatures are experienced in December, with average high temperatures of 28.4°F (-2°C) and lows of 16.7°F (-8.5°C).

Humidity

The average relative humidity in December is 88%.

Rainfall

In Perma, in December, during 9.8 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. Throughout the year, in Perma, there are 129.9 rainfall days, and 13.5" (343mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall in Perma, Montana. In Perma, during December, snow falls for 14.5 days and regularly aggregates up to 5.39" (137mm) of snow. Throughout the year, in Perma, there are 67.1 snowfall days, and 28.27" (718mm) of snow is accumulated.

Daylight

With an average of 8h and 30min of daylight, December has the shortest days of the year in Perma, Montana.
On the first day of the month, sunrise is at 8:05 am and sunset at 4:49 pm. On the last day of December, in Perma, sunrise is at 8:25 am and sunset at 4:57 pm MST.

Sunshine

The average sunshine in December in Perma, Montana, is 5.1h.

UV index

The months with the lowest UV index are February and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index, 1 in December, converts into the following recommendations:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Boost your sun resistance with garments that are densely woven yet spacious. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month in Perma?

December, characterized by an average high temperature of 28.4°F (-2°C) and a low temperature of 16.7°F (-8.5°C), is generally the coldest month in Perma.

How cold is it in Perma in December?

In December, the average high-temperature and low-temperature in Perma, Montana, are 28.4°F (-2°C) and 16.7°F (-8.5°C) respectively.

What is the average humidity in December in Perma?

In December, the average relative humidity in Perma is 88%.

How many days does it rain in December in Perma?

In Perma, in December, during 9.8 rainfall days, 1.06" (27mm) of precipitation is typically accumulated.

How many days does it snow in December in Perma?

In December, in Perma, Montana, it is snowing for 14.5 days. Throughout December, 5.39" (137mm) of snow is accumulated.

What is the month with the shortest days in Perma?

The month with the shortest days in Perma is December, with an average of 8h and 30min of daylight.

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

The average day length in December in Perma, Montana, is 8h and 32min.

When is the sunrise / sunset in December in Perma?

On the first day of December in Perma, Montana, sunrise is at 8:05 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 8:25 am and sunset at 4:57 pm MST.

How long on average sun shines in December in Perma?

In December, the average sunshine duration in Perma is 5.1h.

What are the months with the lowest UV index in Perma?

February and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index intensity in December in Perma?

In Perma, the average daily maximum UV index in December is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from exposure to the Sun's UV radiation.
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
Perma, MT

Average temperature in December - Perma, MT
  • Average high temperature in December: 28.4°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (28.4°F).

  • Average low temperature in December: 16.7°F

The month with the highest average low temperature is August (49.5°F).
The coldest month (with the lowest average low temperature) is December (16.7°F).

Average pressure in December
Perma, MT

Average pressure in December - Perma, MT
  • Average pressure in December: 30.17"Hg

The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Perma, MT

Average wind speed in December - Perma, MT
  • Average wind speed in December: 3.9mph

The windiest month (with the highest average wind speed) is April (4.8mph).
The calmest months (with the lowest average wind speed) are January, August and December (3.9mph).

Average humidity in December
Perma, MT

Average humidity in December - Perma, MT
  • Average humidity in December: 88%

The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is August (49%).

Average rainfall in December
Perma, MT

Average rainfall in December - Perma, MT
  • Average rainfall in December: 1.06"

The wettest month (with the highest rainfall) is June (2.2").
The driest months (with the least rainfall) are July and August (0.63").

Average rainfall days in December
Perma, MT

Average rainfall days in December - Perma, MT
  • Average rainfall days in December: 9.8 days

The month with the highest number of rainy days is June (15.7 days).
The month with the least rainy days is August (7.4 days).

Average snowfall in December
Perma, MT

Average snowfall in December - Perma, MT
  • Average snowfall in December: 5.39"

The month with the highest snowfall is February (6.5").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
Perma, MT

Average snowfall days in December - Perma, MT
  • Average snowfall days in December: 14.5 days

The month with the highest number of snowfall days is December (14.5 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Perma, MT
  • Average daylight in December: 8h and 3min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

Average sunshine days in December
Perma, MT

Average sunshine days in December - Perma, MT
  • Average sunshine days in December: 13.5 days

The month with the most sunshine days is July (20.8 days).
The month with the least sunshine days is February (11 days).

Average UV index in December
Perma, MT

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

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February and December (UV index 1).

Average cloud cover in December
Perma, MT

Average cloud cover in December - Perma, MT
  • Average cloud cover in December: 49

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 14).

Average visibility in December
Perma, MT

Average visibility in December - Perma, MT
  • Average visibility in December: 4mi

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

Perma, Montana, USA

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