January weather forecast
Great Falls, MT

A far view from on top of the vast Missouri River of the City of Lights, Great Falls, Montana
A far view from on top of the vast Missouri River of the City of Lights, Great Falls, Montana

Weather in January

January in Great Falls, Montana, is a cold winter month, with an average temperature varying between 32.4°F (0.2°C) and 19.8°F (-6.8°C).

Temperature

In January, the average high-temperature is relatively the same as in December - a cold 32.4°F (0.2°C). The average low-temperature, in January, is 19.8°F (-6.8°C).

Humidity

January is the most humid month in Great Falls, with an average relative humidity of 77%.

Rainfall

In Great Falls, Montana, during 3.6 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. In Great Falls, during the entire year, the rain falls for 68.2 days and collects up to 4.49" (114mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall. In Great Falls, in January, snow falls for 7.1 days, with typically accumulated 1.46" (37mm) of snow. In Great Falls, during the entire year, snow falls for 45.4 days and aggregates up to 11.61" (295mm) of snow.

Daylight

The average length of the day in January is 8h and 58min.
On the first day of January in Great Falls, sunrise is at 8:12 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:52 am and sunset at 5:25 pm MST.

Sunshine

January, February and December, with an average of 5.5h of sunshine, are months with the least sunshine in Great Falls, Montana.

UV index

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 2 in January transform into the following instructions:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in January in Great Falls?

In Great Falls, in January, the average high-temperature is 32.4°F (0.2°C), and the average low-temperature is 19.8°F (-6.8°C).

What is the most humid month in Great Falls?

With an average relative humidity of 77%, January is the most humid month in Great Falls.

What is the average humidity in January in Great Falls?

In January, the average relative humidity in Great Falls, Montana, is 77%.

How much does it rain in Great Falls in January?

In Great Falls, in January, during 3.6 rainfall days, 0.2" (5mm) of precipitation is typically accumulated.

How much does it snow in Great Falls in January?

In Great Falls, Montana, during January, snow falls for 7.1 days and regularly aggregates up to 1.46" (37mm) of snow.

How many hours of daylight does Great Falls have in January?

In Great Falls, the average day length in January is 8h and 58min.

When is the sunrise / sunset in January in Great Falls?

In January, on the first day of the month, sunrise is at 8:12 am and sunset at 4:44 pm. On the last day of the month, in Great Falls, sunrise is at 7:52 am and sunset at 5:25 pm MST.

What are the months with the least sunshine in Great Falls?

The months with the least sunshine are January, February and December, with an average of 5.5h of sunshine.

How many hours of sunshine does Great Falls have in January?

The average sunshine duration in January is 5.5h.

What is the month with the lowest UV index in Great Falls?

January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index intensity in January in Great Falls?

The average daily maximum UV index in January in Great Falls is 2. A UV Index value 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 sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Great Falls, MT

Average temperature in January - Great Falls, MT
  • Average high temperature in January: 32.4°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (30°F).

  • Average low temperature in January: 19.8°F

The month with the highest average low temperature is August (57.7°F).
The coldest months (with the lowest average low temperature) are February and December (18.3°F).

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Average pressure in January
Great Falls, MT

Average pressure in January - Great Falls, MT
  • Average pressure in January: 30.14"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in January
Great Falls, MT

Average wind speed in January - Great Falls, MT
  • Average wind speed in January: 11.2mph

The windiest month (with the highest average wind speed) is November (11.4mph).
The calmest month (with the lowest average wind speed) is August (7.7mph).

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Average humidity in January
Great Falls, MT

Average humidity in January - Great Falls, MT
  • Average humidity in January: 77%

The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (40%).

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Average rainfall in January
Great Falls, MT

Average rainfall in January - Great Falls, MT
  • Average rainfall in January: 0.2"

The wettest month (with the highest rainfall) is June (0.87").
The driest month (with the least rainfall) is December (0.16").

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Average rainfall days in January
Great Falls, MT

Average rainfall days in January - Great Falls, MT
  • Average rainfall days in January: 3.6 days

The month with the highest number of rainy days is April (9.9 days).
The month with the least rainy days is December (2.7 days).

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Average snowfall in January
Great Falls, MT

Average snowfall in January - Great Falls, MT
  • Average snowfall in January: 1.46"

The month with the highest snowfall is February (2.09").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in January
Great Falls, MT

Average snowfall days in January - Great Falls, MT
  • Average snowfall days in January: 7.1 days

The month with the highest number of snowfall days is February (10 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in January /
Average sunshine in January
Great Falls, MT

Average daylight in January / Average sunshine in January - Great Falls, MT
  • Average daylight in January: 8h and 58min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 31min).

  • Average sunshine in January: 5h and 30min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 30min).

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Average sunshine days in January
Great Falls, MT

Average sunshine days in January - Great Falls, MT
  • Average sunshine days in January: 22.4 days

The month with the most sunshine days is July (26.1 days).
The months with the least sunshine days are February and April (16.2 days).

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Average UV index in January
Great Falls, MT

Average UV index in January - Great Falls, MT
  • Average UV index in January: 2

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

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Average cloud cover in January
Great Falls, MT

Average cloud cover in January - Great Falls, MT
  • Average cloud cover in January: 41

The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 13).

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Average visibility in January
Great Falls, MT

Average visibility in January - Great Falls, MT
  • Average visibility in January: 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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