December weather forecast
Big Sandy, MT

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Weather in December

December, the first month of the winter in Big Sandy, is still a freezing cold month, with an average temperature varying between 18.3°F (-7.6°C) and 30.2°F (-1°C).

Temperature

December, with an average high of 30.2°F (-1°C) and a low of 18.3°F (-7.6°C), signifies the coldest month of the year.

Humidity

In December, the average relative humidity is 76%.

Rainfall

The month with the least rainfall is December, when the rain falls for 4.5 days and typically collects 0.28" (7mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. In December, it is snowing for 8.5 days. Throughout December, 1.69" (43mm) of snow is accumulated. Throughout the year, there are 44.2 snowfall days, and 11.18" (284mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 8h and 24min of daylight.
On the first day of December in Big Sandy, sunrise is at 7:50 am and sunset at 4:28 pm. On the last day of the month, sunrise is at 8:10 am and sunset at 4:36 pm MST.

Sunshine

In Big Sandy, the average sunshine in December is 5.4h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily high UV index of 2 during December translates into the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The solar radiation around mid-day is intense; avoid the Sun and stay safe. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Updated: Jun 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months?

Temperature readings reach their annual highs in December, averaging 30.2°F (-1°C) and a minimum average of 18.3°F (-7.6°C).

How cold is it in Big Sandy in December?

The high-temperature during December is 30.2°F (-1°C) and the low-temperature is 18.3°F (-7.6°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in July is computed to be 84.2°F (29°C).

What is the average humidity in December?

In December, the average relative humidity is 76%.

What is the driest month?

December is the month with the least rainfall. Rain falls for 4.5 days and accumulates 0.28" (7mm) of precipitation.

How much does it rain in December?

In Big Sandy, in December, it is raining for 4.5 days, with typically 0.28" (7mm) of accumulated precipitation.

How many days does it snow in December?

In Big Sandy, Montana, in December, during 8.5 snowfall days, 1.69" (43mm) of snow is typically accumulated.

What is the month with the shortest days?

December has the shortest days of the year in Big Sandy, with an average of 8h and 24min of daylight.

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

In December, the average day length is 8h and 26min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:50 am and sunset at 4:28 pm. On the last day of the month, in Big Sandy, Montana, sunrise is at 8:10 am and sunset at 4:36 pm MST.

How many hours of sunshine does Big Sandy have in December?

The average sunshine duration in December is 5.4h.

What is the month with the lowest UV index?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Big Sandy.

How high is the UV index in December?

In Big Sandy, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk 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
Big Sandy, MT

Average temperature in December - Big Sandy, MT
  • Average high temperature in December: 30.2°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (30.2°F).

  • Average low temperature in December: 18.3°F

The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is February (17.8°F).

Average pressure in December
Big Sandy, MT

Average pressure in December - Big Sandy, 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 (29.85"Hg).

Average wind speed in December
Big Sandy, MT

Average wind speed in December - Big Sandy, MT
  • Average wind speed in December: 10.1mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (8.5mph).

Average humidity in December
Big Sandy, MT

Average humidity in December - Big Sandy, MT
  • Average humidity in December: 76%

The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (38%).

Average rainfall in December
Big Sandy, MT

Average rainfall in December - Big Sandy, MT
  • Average rainfall in December: 0.28"

The wettest month (with the highest rainfall) is June (1.22").
The driest month (with the least rainfall) is December (0.28").

Average rainfall days in December
Big Sandy, MT

Average rainfall days in December - Big Sandy, MT
  • Average rainfall days in December: 4.5 days

The month with the highest number of rainy days is May (12.5 days).
The month with the least rainy days is February (4.2 days).

Average snowfall in December
Big Sandy, MT

Average snowfall in December - Big Sandy, MT
  • Average snowfall in December: 1.69"

The month with the highest snowfall is January (2.4").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
Big Sandy, MT

Average snowfall days in December - Big Sandy, MT
  • Average snowfall days in December: 8.5 days

The month with the highest number of snowfall days is January (9.2 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in December /
Average sunshine in December
Big Sandy, MT

Average daylight in December / Average sunshine in December - Big Sandy, 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: 5h and 2min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 18min).

Average sunshine days in December
Big Sandy, MT

Average sunshine days in December - Big Sandy, MT
  • Average sunshine days in December: 20.4 days

The month with the most sunshine days is September (21.5 days).
The month with the least sunshine days is June (14.6 days).

Average UV index in December
Big Sandy, MT

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

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Big Sandy, MT

Average cloud cover in December - Big Sandy, MT
  • Average cloud cover in December: 43

The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 14).

Average visibility in December
Big Sandy, MT

Average visibility in December - Big Sandy, 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).

Big Sandy, Montana, USA

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