December weather forecast
Big Timber, MT

Weather in December

The first month of the winter, December, is also a subzero cold month in Big Timber, Montana, with an average temperature ranging between max 28.4°F (-2°C) and min 16°F (-8.9°C).

Temperature

December is the coldest month, with an average high-temperature of 28.4°F (-2°C) and an average low-temperature of 16°F (-8.9°C).

Humidity

The average relative humidity in December is 78%.

Rainfall

In Big Timber, during 5.3 rainfall days, 0.59" (15mm) of precipitation is typically accumulated. In Big Timber, during the entire year, the rain falls for 129.6 days and collects up to 15.83" (402mm) of precipitation.

Snowfall

Months with snowfall in Big Timber are January through May, September through December. In December, in Big Timber, it is snowing for 10.5 days. Throughout December, 4.61" (117mm) of snow is accumulated. Throughout the year, in Big Timber, Montana, there are 67.6 snowfall days, and 38.19" (970mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 8h and 44min of daylight.
On the first day of December in Big Timber, sunrise is at 7:40 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 8:00 am and sunset at 4:44 pm MST.

Sunshine

January, February and December, with an average of 6.2h of sunshine, are months with the least sunshine in Big Timber.

UV index

The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Big Timber?

December is the coldest month in Big Timber, with an average high-temperature of 28.4°F (-2°C) and an average low-temperature of 16°F (-8.9°C).

What is the average humidity in December in Big Timber?

In December, the average relative humidity in Big Timber, Montana, is 78%.

How many days does it rain in December in Big Timber?

In December, in Big Timber, the rain falls for 5.3 days. Throughout December, 0.59" (15mm) of precipitation is accumulated.

How many days does it snow in December in Big Timber?

In December, in Big Timber, it is snowing for 10.5 days. Throughout December, 4.61" (117mm) of snow is accumulated.

What is the month with the shortest days in Big Timber?

With an average of 8h and 44min of daylight, December has the shortest days of the year.

What is the average length of the day in December in Big Timber?

The average day length in December is 8h and 44min.

What time are sunrise and sunset in December in Big Timber?

On the first day of December, sunrise is at 7:40 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 8:00 am and sunset at 4:44 pm MST.

What is the month with the least sunshine in Big Timber?

The months with the least sunshine in Big Timber are January, February and December, with an average of 6.2h of sunshine.

How long on average sun shines in December in Big Timber?

The average sunshine duration in December in Big Timber, Montana, is 6.2h.

What are the months with the lowest UV index in Big Timber?

The months with the lowest UV index in Big Timber, Montana, are January through April, October through December, with an average maximum UV index of 2.

How high is the UV index in December in Big Timber?

In Big Timber, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health 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
Big Timber, MT

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

The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is December (28.4°F).

  • Average low temperature in December: 16°F

The month with the highest average low temperature is August (52.9°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).

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Average pressure in December
Big Timber, MT

Average pressure in December - Big Timber, MT
  • Average pressure in December: 30.16"Hg

The months with the highest atmospheric pressure are January and December (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).

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Average wind speed in December
Big Timber, MT

Average wind speed in December - Big Timber, MT
  • Average wind speed in December: 10.5mph

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).

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Average humidity in December
Big Timber, MT

Average humidity in December - Big Timber, MT
  • Average humidity in December: 78%

The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is August (47%).

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Average rainfall in December
Big Timber, MT

Average rainfall in December - Big Timber, MT
  • Average rainfall in December: 0.59"

The wettest month (with the highest rainfall) is May (3.15").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in December
Big Timber, MT

Average rainfall days in December - Big Timber, MT
  • Average rainfall days in December: 5.3 days

The month with the highest number of rainy days is May (19.8 days).
The months with the least rainy days are January and December (5.3 days).

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Average snowfall in December
Big Timber, MT

Average snowfall in December - Big Timber, MT
  • Average snowfall in December: 4.61"

The month with the highest snowfall is March (7.09").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in December
Big Timber, MT

Average snowfall days in December - Big Timber, MT
  • Average snowfall days in December: 10.5 days

The month with the highest number of snowfall days is February (12.9 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
Big Timber, MT

Average daylight in December / Average sunshine in December - Big Timber, MT
  • Average daylight in December: 8h and 44min

The month with the longest days is June (Average daylight: 15h and 40min).
The month with the shortest days is December (Average daylight: 8h and 44min).

  • Average sunshine in December: 6h and 12min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 6h and 12min).

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Average sunshine days in December
Big Timber, MT

Average sunshine days in December - Big Timber, MT
  • Average sunshine days in December: 19.3 days

The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is May (7.7 days).

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Average UV index in December
Big Timber, MT

Average UV index in December - Big Timber, MT
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

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Average cloud cover in December
Big Timber, MT

Average cloud cover in December - Big Timber, MT
  • Average cloud cover in December: 37

The month with the most cloud cover is February (Cloud cover 41).
The months with the least cloud cover are July and August (Cloud cover 16).

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Average visibility in December
Big Timber, MT

Average visibility in December - Big Timber, 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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