December weather forecast
Libby, MT

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Weather in December

December witnesses the reappearance of winter's peak in Libby, Montana, with average high temperatures plummeting further down. The stark contrast in temperatures between December and the prior month of November amplifies the onset of winter. The highest snowfall of the year measuring up to 11.1" (282mm) becomes a striking feature of this month. Limited daylight hours, decreased visibility, and higher humidity make December the coldest month of the year.

Temperature

December, noted for its average high-temperature of 27.1°F (-2.7°C) and an average low-temperature of 15.1°F (-9.4°C), is considered the coldest month.

Humidity

The average relative humidity in December in Libby is 92%.

Rainfall

The month with the most rainfall in Libby is December, when the rain falls for 9.6 days and typically aggregates up to 2.24" (57mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. In Libby, during December, snow falls for 20 days and regularly aggregates up to 11.1" (282mm) of snow. Throughout the year, there are 91.8 snowfall days, and 49.33" (1253mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Libby, with an average of 8h and 24min of daylight.
On the first day of December, sunrise is at 8:13 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 8:33 am and sunset at 4:57 pm MST.

Sunshine

In Libby, the average sunshine in December is 3.5h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The UV index of 1 in December translates into these instructions:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest in Libby?

December, with its high-temperature average of 27.1°F (-2.7°C) and a low-temperature average of 15.1°F (-9.4°C), is the coldest month in Libby, Montana.

How cold is December in Libby?

During December, Libby experiences an average high-temperature of 27.1°F (-2.7°C) and a low-temperature of 15.1°F (-9.4°C).

What is the average humidity in December in Libby?

In December, the average relative humidity is 92%.

What is the wettest month in Libby?

The month with the most rainfall in Libby is December, when the rain falls for 9.6 days and typically aggregates up to 2.24" (57mm) of precipitation.

How many days does it rain in December in Libby?

In December, the rain falls for 9.6 days. Throughout December, 2.24" (57mm) of precipitation is accumulated.

How much does it snow in Libby in December?

In Libby, in December, snow falls for 20 days, with typically accumulated 11.1" (282mm) of snow.

What is the month with the shortest days in Libby?

The month with the shortest days in Libby is December, with an average of 8h and 24min of daylight.

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

The average day length in December is 8h and 24min.

When are sunrise and sunset in December in Libby?

On the first day of December in Libby, Montana, sunrise is at 8:13 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 8:33 am and sunset at 4:57 pm MST.

How many hours of sunshine does Libby have in December?

In Libby, the average sunshine duration in December is 3.5h.

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

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

How high is the UV index in December in Libby?

The average daily maximum UV index in December in Libby is 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe 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
Libby, MT

Average temperature in December - Libby, MT
  • Average high temperature in December: 27.1°F

The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is December (27.1°F).

  • Average low temperature in December: 15.1°F

The month with the highest average low temperature is August (47.3°F).
The coldest month (with the lowest average low temperature) is December (15.1°F).

Average pressure in December
Libby, MT

Average pressure in December - Libby, 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
Libby, MT

Average wind speed in December - Libby, MT
  • Average wind speed in December: 3.5mph

The windiest months (with the highest average wind speed) are April and June (4.5mph).
The calmest month (with the lowest average wind speed) is December (3.5mph).

Average humidity in December
Libby, MT

Average humidity in December - Libby, MT
  • Average humidity in December: 92%

The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is August (53%).

Average rainfall in December
Libby, MT

Average rainfall in December - Libby, MT
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is December (2.24").
The driest month (with the least rainfall) is August (0.43").

Average rainfall days in December
Libby, MT

Average rainfall days in December - Libby, MT
  • Average rainfall days in December: 9.6 days

The month with the highest number of rainy days is April (17.5 days).
The month with the least rainy days is August (5.9 days).

Average snowfall in December
Libby, MT

Average snowfall in December - Libby, MT
  • Average snowfall in December: 11.1"

The month with the highest snowfall is January (11.34").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
Libby, MT

Average snowfall days in December - Libby, MT
  • Average snowfall days in December: 20 days

The month with the highest number of snowfall days is December (20 days).
The months with the least snowfall days are June, July and August (0 days).

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

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

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).

  • Average sunshine in December: 3h and 3min

The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in December
Libby, MT

Average sunshine days in December - Libby, MT
  • Average sunshine days in December: 8.6 days

The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (7.4 days).

Average UV index in December
Libby, MT

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

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).

Average cloud cover in December
Libby, MT

Average cloud cover in December - Libby, MT
  • Average cloud cover in December: 67

The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 15).

Average visibility in December
Libby, MT

Average visibility in December - Libby, MT
  • Average visibility in December: 3mi

The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).

Libby, Montana, USA

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