January weather forecast
Big Sky, MT

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Vast fields and planted forests near the scenic mountainous region in Big Sky, Montana
Vast fields and planted forests near the scenic mountainous region in Big Sky, Montana

Weather in January

In Big Sky, January weather is defined by its chilly temperatures and a significant amount of snow. The lowest temperatures for the year occur in January, dipping to 9.9°F (-12.3°C), reinforcing its position as the coldest month. Highs of 25°F (-3.9°C) do not temper the biting cold much. January also marks a specific period for winter outdoor activities, with snow blanketing the city for most of the month. Visibility is also at its least, encouraging locals and tourists alike to embrace a slower, indoor lifestyle.

Temperature

During January, the average high-temperature is a still freezing cold 25°F (-3.9°C), maintaining a close resemblance to that of the preceding month. An average low-temperature of 9.9°F (-12.3°C) is noted during the nights in January.

Humidity

January and February, with an average relative humidity of 90%, are the most humid months.

Rainfall

In Big Sky, in January, it is raining for 4.8 days, with typically 1.54" (39mm) of accumulated precipitation. Throughout the year, in Big Sky, there are 116.1 rainfall days, and 23.5" (597mm) of precipitation is accumulated.

Snowfall

January through December are months with snowfall. In Big Sky, Montana, during January, snow falls for 18.9 days and regularly aggregates up to 12.72" (323mm) of snow. In Big Sky, during the entire year, snow falls for 151.6 days and aggregates up to 124.06" (3151mm) of snow.

Daylight

In January, the average length of the day is 9h and 13min.
On the first day of January in Big Sky, sunrise is at 8:04 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:30 pm MST.

Sunshine

January has the least sunshine of the year in Big Sky, with an average of 4.7h of sunshine.

UV index

The months with the lowest UV index in Big Sky, Montana, are January and February, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: A typical high UV index of 1 in January suggests the following recommendations:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
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Frequently asked questions

How cold is it in Big Sky in January?

The high-temperature, in January, in Big Sky, is 25°F (-3.9°C), while the low-temperature averages to 9.9°F (-12.3°C).

What are the most humid months in Big Sky?

The months with the highest humidity are January and February, with an average relative humidity of 90%.

What is the average humidity in January in Big Sky?

The average relative humidity in January in Big Sky is 90%.

How much does it rain in Big Sky in January?

In Big Sky, Montana, in January, it is raining for 4.8 days, with typically 1.54" (39mm) of accumulated precipitation.

How many days does it snow in January in Big Sky?

In Big Sky, Montana, in January, snow falls for 18.9 days, with typically accumulated 12.72" (323mm) of snow.

What is the average length of the day in January in Big Sky?

In Big Sky, Montana, the average day length in January is 9h and 13min.

When is the sunrise / sunset in January in Big Sky?

In January, on the first day of the month, sunrise is at 8:04 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:30 pm MST.

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

January has the least sunshine of the year in Big Sky, Montana, with an average of 4.7h of sunshine.

How long on average sun shines in January in Big Sky?

The average sunshine duration in January is 4.7h.

When is the lowest UV index in Big Sky?

The months with the lowest UV index in Big Sky are January and February, with an average maximum UV index of 1.

How high is the UV index in January in Big Sky?

In January, the average daily maximum UV index in Big Sky is 1. A UV Index value of 2, and less, symbolizes 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 January
Big Sky, MT

Average temperature in January - Big Sky, MT
  • Average high temperature in January: 25°F

The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is December (22.5°F).

  • Average low temperature in January: 9.9°F

The month with the highest average low temperature is August (45.1°F).
The coldest month (with the lowest average low temperature) is December (7.9°F).

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Average pressure in January
Big Sky, MT

Average pressure in January - Big Sky, MT
  • Average pressure in January: 30.22"Hg

The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in January
Big Sky, MT

Average wind speed in January - Big Sky, MT
  • Average wind speed in January: 7.1mph

The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in January
Big Sky, MT

Average humidity in January - Big Sky, MT
  • Average humidity in January: 90%

The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is August (51%).

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Average rainfall in January
Big Sky, MT

Average rainfall in January - Big Sky, MT
  • Average rainfall in January: 1.54"

The wettest months (with the highest rainfall) are April and May (2.91").
The driest month (with the least rainfall) is July (1.18").

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Average rainfall days in January
Big Sky, MT

Average rainfall days in January - Big Sky, MT
  • Average rainfall days in January: 4.8 days

The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is February (4.3 days).

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Average snowfall in January
Big Sky, MT

Average snowfall in January - Big Sky, MT
  • Average snowfall in January: 12.72"

The month with the highest snowfall is April (19.88").
The month with the least snowfall is August (0.08").

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Average snowfall days in January
Big Sky, MT

Average snowfall days in January - Big Sky, MT
  • Average snowfall days in January: 18.9 days

The month with the highest number of snowfall days is March (21 days).
The month with the least snowfall days is August (0.3 days).

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Average daylight in January /
Average sunshine in January
Big Sky, MT

Average daylight in January / Average sunshine in January - Big Sky, MT
  • Average daylight in January: 9h and 1min

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 January: 4h and 4min

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

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Average sunshine days in January
Big Sky, MT

Average sunshine days in January - Big Sky, MT
  • Average sunshine days in January: 12.3 days

The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is May (5.7 days).

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Average UV index in January
Big Sky, MT

Average UV index in January - Big Sky, MT
  • Average UV index in January: 1

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January and February (UV index 1).

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Average cloud cover in January
Big Sky, MT

Average cloud cover in January - Big Sky, MT
  • Average cloud cover in January: 55

The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 17).

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Average visibility in January
Big Sky, MT

Average visibility in January - Big Sky, MT
  • Average visibility in January: 4mi

The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).

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Big Sky, Montana, USA

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