December weather forecast
Roanwood, MT

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Weather in December

The first month of the winter, December, is also a subzero cold month in Roanwood, Montana, with an average temperature fluctuating between 12.7°F (-10.7°C) and 24.6°F (-4.1°C).

Temperature

December's onset corresponds with a shift in the average high-temperature, moving from a wintry 38.3°F (3.5°C) in November to a subzero cold 24.6°F (-4.1°C). Throughout the December nights, Roanwood encounters a low-temperature of 12.7°F (-10.7°C).

Humidity

In December, the average relative humidity is 84%.

Rainfall

In Roanwood, Montana, in December, during 3 rainfall days, 0.43" (11mm) of precipitation is typically accumulated. In Roanwood, during the entire year, the rain falls for 90.8 days and collects up to 11.1" (282mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. December is the month with the most snowfall in Roanwood, Montana. Snow falls for 8.6 days and accumulates 2.6" (66mm) of snow.

Daylight

December has the shortest days of the year in Roanwood, Montana, with an average of 8h and 18min of daylight.
On the first day of the month, sunrise is at 7:39 am and sunset at 4:11 pm. On the last day of December, sunrise is at 7:59 am and sunset at 4:19 pm MST.

Sunshine

The average sunshine in December in Roanwood is 4.9h.

UV index

The month with the lowest UV index in Roanwood is December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the average person.
Note: In December, the average maximum UV index of 1 translates into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

How cold is December in Roanwood?

An average high-temperature, in December, in Roanwood, is 24.6°F (-4.1°C) and the average low-temperature is 12.7°F (-10.7°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, in August is calculated to be 80.6°F (27°C).

What is the average humidity in December in Roanwood?

In December, the average relative humidity is 84%.

How many days does it rain in December in Roanwood?

In Roanwood, during December, the rain falls for 3 days and regularly aggregates up to 0.43" (11mm) of precipitation.

When does it snow the most in Roanwood?

The month with the most snowfall in Roanwood, Montana, is December, when snow falls for 8.6 days and typically aggregates up to 2.6" (66mm) of snow.

How many days does it snow in December in Roanwood?

In December, in Roanwood, Montana, it is snowing for 8.6 days. Throughout December, 2.6" (66mm) of snow is accumulated.

What is the month with the shortest days in Roanwood?

The month with the shortest days is December, with an average of 8h and 18min of daylight.

How many hours of daylight does Roanwood have in December?

The average day length in December is 8h and 19min.

What time are sunrise and sunset in December in Roanwood?

In December, on the first day of the month, sunrise is at 7:39 am and sunset at 4:11 pm. On the last day of the month, sunrise is at 7:59 am and sunset at 4:19 pm MST.

How long on average sun shines in December in Roanwood?

In Roanwood, Montana, the average sunshine duration in December is 4.9h.

When is the lowest UV index in Roanwood?

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

What is the UV index intensity in December in Roanwood?

In Roanwood, the average daily maximum UV index in December is 1. A UV Index reading 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
Roanwood, MT

Average temperature in December - Roanwood, MT
  • Average high temperature in December: 24.6°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is February (23.7°F).

  • Average low temperature in December: 12.7°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is February (10.2°F).

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Average pressure in December
Roanwood, MT

Average pressure in December - Roanwood, MT
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is February (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.83"Hg).

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Average wind speed in December
Roanwood, MT

Average wind speed in December - Roanwood, MT
  • Average wind speed in December: 9.3mph

The windiest month (with the highest average wind speed) is April (11.7mph).
The calmest month (with the lowest average wind speed) is February (8.8mph).

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Average humidity in December
Roanwood, MT

Average humidity in December - Roanwood, MT
  • Average humidity in December: 84%

The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (42%).

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Average rainfall in December
Roanwood, MT

Average rainfall in December - Roanwood, MT
  • Average rainfall in December: 0.43"

The wettest month (with the highest rainfall) is June (2.01").
The driest months (with the least rainfall) are January and February (0.35").

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Average rainfall days in December
Roanwood, MT

Average rainfall days in December - Roanwood, MT
  • Average rainfall days in December: 3 days

The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is February (2.3 days).

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Average snowfall in December
Roanwood, MT

Average snowfall in December - Roanwood, MT
  • Average snowfall in December: 2.6"

The month with the highest snowfall is December (2.6").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Roanwood, MT

Average snowfall days in December - Roanwood, MT
  • Average snowfall days in December: 8.6 days

The month with the highest number of snowfall days is February (9.2 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
Roanwood, MT

Average daylight in December / Average sunshine in December - Roanwood, MT
  • Average daylight in December: 8h and 2min

The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).

  • Average sunshine in December: 4h and 5min

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

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Average sunshine days in December
Roanwood, MT

Average sunshine days in December - Roanwood, MT
  • Average sunshine days in December: 20.4 days

The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is June (13.8 days).

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Average UV index in December
Roanwood, MT

Average UV index in December - Roanwood, 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
Roanwood, MT

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

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 16).

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Average visibility in December
Roanwood, MT

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

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