December weather forecast
Capitol, MT

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Weather in December

The first month of the winter, December, is still a freezing cold month in Capitol, Montana, with an average temperature varying between 16°F (-8.9°C) and 27.9°F (-2.3°C).

Temperature

Transition into December marks a drop in the average high-temperature, moving from a wintry 42.1°F (5.6°C) in November to a subzero cold 27.9°F (-2.3°C). During the month of December, an average temperature of 16°F (-8.9°C) is noted during the nights.

Humidity

In Capitol, Montana, the average relative humidity in December is 79%.

Rainfall

In Capitol, in December, it is raining for 3.8 days, with typically 0.59" (15mm) of accumulated precipitation. In Capitol, during the entire year, the rain falls for 103.8 days and collects up to 14.88" (378mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Capitol, in December, snow falls for 10.9 days, with typically accumulated 2.76" (70mm) of snow. In Capitol, during the entire year, snow falls for 62.2 days and aggregates up to 22.95" (583mm) of snow.

Daylight

With an average of 8h and 48min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:16 am and sunset at 4:14 pm. On the last day of December, in Capitol, sunrise is at 7:35 am and sunset at 4:23 pm MST.

Sunshine

In Capitol, the average sunshine in December is 5.2h.

UV index

The months with the lowest UV index in Capitol are February and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: An average UV index of 1 in December transforms into this advice:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Stay sun-safe with clothing that is both closely woven and worn loosely. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.
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Frequently asked questions

How cold is December in Capitol?

The high-temperature, in December, in Capitol, records 27.9°F (-2.3°C), while the low-temperature is 16°F (-8.9°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, is calculated to be 84.2°F (29°C).

What is the average humidity in December in Capitol?

In Capitol, Montana, the average relative humidity in December is 79%.

How much does it rain in Capitol in December?

In Capitol, Montana, during December, the rain falls for 3.8 days and regularly aggregates up to 0.59" (15mm) of precipitation.

How many days does it snow in December in Capitol?

In Capitol, Montana, during December, snow falls for 10.9 days and regularly aggregates up to 2.76" (70mm) of snow.

What is the month with the shortest days in Capitol?

The month with the shortest days in Capitol, Montana, is December, with an average of 8h and 48min of daylight.

How many hours of daylight does Capitol have in December?

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

When are sunrise and sunset in December in Capitol?

In December, on the first day of the month, sunrise is at 7:16 am and sunset at 4:14 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:23 pm MST.

How long on average sun shines in December in Capitol?

In December, the average sunshine duration is 5.2h.

When is the lowest UV index in Capitol?

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

What is the UV index reading in December in Capitol?

In December, the average daily maximum UV index in Capitol is 1. A UV Index estimate of 2, and below, represents a low health risk 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
Capitol, MT

Average temperature in December - Capitol, MT
  • Average high temperature in December: 27.9°F

The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (27.3°F).

  • Average low temperature in December: 16°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).

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Average pressure in December
Capitol, MT

Average pressure in December - Capitol, MT
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

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Average wind speed in December
Capitol, MT

Average wind speed in December - Capitol, MT
  • Average wind speed in December: 11.2mph

The windiest months (with the highest average wind speed) are January and October (11.9mph).
The calmest month (with the lowest average wind speed) is July (9.8mph).

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Average humidity in December
Capitol, MT

Average humidity in December - Capitol, MT
  • Average humidity in December: 79%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is August (47%).

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Average rainfall in December
Capitol, MT

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

The wettest month (with the highest rainfall) is May (2.68").
The driest months (with the least rainfall) are January and November (0.51").

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Average rainfall days in December
Capitol, MT

Average rainfall days in December - Capitol, MT
  • Average rainfall days in December: 3.8 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (3.3 days).

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Average snowfall in December
Capitol, MT

Average snowfall in December - Capitol, MT
  • Average snowfall in December: 2.76"

The month with the highest snowfall is March (4.37").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Capitol, MT

Average snowfall days in December - Capitol, MT
  • Average snowfall days in December: 10.9 days

The month with the highest number of snowfall days is February (12.3 days).
The 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
Capitol, MT

Average daylight in December / Average sunshine in December - Capitol, 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: 5h and 1min

The month with the most sunshine is August (Average sunshine: 11h and 30min).
The months with the least sunshine are January and February (Average sunshine: 5h and 0min).

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Average sunshine days in December
Capitol, MT

Average sunshine days in December - Capitol, MT
  • Average sunshine days in December: 17.7 days

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is April (11.6 days).

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Average UV index in December
Capitol, MT

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

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February and December (UV index 1).

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Average cloud cover in December
Capitol, MT

Average cloud cover in December - Capitol, MT
  • Average cloud cover in December: 47

The months with the most cloud cover are January and February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 18).

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Average visibility in December
Capitol, MT

Average visibility in December - Capitol, 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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Capitol, Montana, USA

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