December weather forecast
Colstrip, MT

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Weather in December

December rings in the full might of winter to Colstrip, characterized by the lowest temperature ranges of the season. At the same time, snowfall mounts up to 3.15" (80mm) and befalls upon the city across the highest number of days in a year. The sunshine and daylight hours also hit their minimum levels. The holiday season amidst the snowy landscape paints a picturesque image of the city. As residents cozy up indoors, December also records its maximum cloud cover, complimenting the afternoons with soft snow-laden light.

Temperature

Colstrip's coldest month, December, generally records average temperatures ranging from a high of 30.4°F (-0.9°C) to a low of 16.7°F (-8.5°C).

Humidity

In December, the average relative humidity in Colstrip is 77%.

Rainfall

The month with the least rainfall is December, when the rain falls for 3.4 days and typically collects 0.47" (12mm) of precipitation.

Snowfall

Months with snowfall are January through June, September through December. In Colstrip, during December, snow falls for 9.3 days and regularly aggregates up to 3.15" (80mm) of snow. Throughout the year, there are 55.2 snowfall days, and 23.5" (597mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Colstrip, with an average of 8h and 42min of daylight.
On the first day of December, sunrise is at 7:28 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:47 am and sunset at 4:31 pm MST.

Sunshine

In December, the average sunshine in Colstrip is 5.4h.

UV index

The months with the lowest UV index in Colstrip are January through April, November and December, with an average maximum UV index of 2. A UV Index estimate 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, 2 in December, converts into the following recommendations:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. Around midday, solar radiation is most harmful; hence, exposure should be limited. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
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Frequently asked questions

What is the coldest time of year in Colstrip?

December, marked by an average high-temperature of 30.4°F (-0.9°C) and a low-temperature of 16.7°F (-8.5°C), is the coldest month.

How cold is it in Colstrip in December?

In December, the average high-temperature and low-temperature in Colstrip, Montana, are 30.4°F (-0.9°C) and 16.7°F (-8.5°C) respectively. The average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in August is evaluated at 82.4°F (28°C).

What is the average humidity in December in Colstrip?

In Colstrip, Montana, the average relative humidity in December is 77%.

What is the driest month in Colstrip?

December is the month with the least rainfall. Rain falls for 3.4 days and accumulates 0.47" (12mm) of precipitation.

How much does it rain in Colstrip in December?

In December, in Colstrip, the rain falls for 3.4 days. Throughout December, 0.47" (12mm) of precipitation is accumulated.

How much does it snow in Colstrip in December?

In Colstrip, Montana, in December, snow falls for 9.3 days, with typically accumulated 3.15" (80mm) of snow.

What is the month with the shortest days in Colstrip?

With an average of 8h and 42min of daylight, December has the shortest days of the year.

How many hours of daylight does Colstrip have in December?

In Colstrip, the average day length in December is 8h and 44min.

When are sunrise and sunset in December in Colstrip?

In December, on the first day of the month, sunrise is at 7:28 am and sunset at 4:23 pm. On the last day of the month, sunrise is at 7:47 am and sunset at 4:31 pm MST.

How long on average sun shines in December in Colstrip?

The average sunshine duration in December in Colstrip is 5.4h.

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

The months with the lowest UV index are January through April, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Colstrip?

In Colstrip, Montana, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to 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
Colstrip, MT

Average temperature in December - Colstrip, MT
  • Average high temperature in December: 30.4°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is December (30.4°F).

  • Average low temperature in December: 16.7°F

The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (16°F).

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Average pressure in December
Colstrip, MT

Average pressure in December - Colstrip, MT
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in December
Colstrip, MT

Average wind speed in December - Colstrip, MT
  • Average wind speed in December: 8.2mph

The windiest month (with the highest average wind speed) is April (10mph).
The calmest months (with the lowest average wind speed) are July and August (7.8mph).

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Average humidity in December
Colstrip, MT

Average humidity in December - Colstrip, MT
  • Average humidity in December: 77%

The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is August (42%).

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Average rainfall in December
Colstrip, MT

Average rainfall in December - Colstrip, MT
  • Average rainfall in December: 0.47"

The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is December (0.47").

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Average rainfall days in December
Colstrip, MT

Average rainfall days in December - Colstrip, MT
  • Average rainfall days in December: 3.4 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (2.8 days).

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Average snowfall in December
Colstrip, MT

Average snowfall in December - Colstrip, MT
  • Average snowfall in December: 3.15"

The month with the highest snowfall is February (4.33").
The months with the least snowfall are July and August (0").

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Average snowfall days in December
Colstrip, MT

Average snowfall days in December - Colstrip, MT
  • Average snowfall days in December: 9.3 days

The month with the highest number of snowfall days is February (10.4 days).
The months with the least snowfall days are July and August (0 days).

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

Average daylight in December / Average sunshine in December - Colstrip, MT
  • Average daylight in December: 8h and 4min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in December: 5h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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Average sunshine days in December
Colstrip, MT

Average sunshine days in December - Colstrip, MT
  • Average sunshine days in December: 20.5 days

The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (11.3 days).

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Average UV index in December
Colstrip, MT

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

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, April, November and December (UV index 2).

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Average cloud cover in December
Colstrip, MT

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

The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in December
Colstrip, MT

Average visibility in December - Colstrip, MT
  • 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).

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Colstrip, Montana, USA

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