January weather - Winter 2025

Weather in January
Frequently asked questions
Average temperature in January
Average pressure in January
Average wind speed in January
Average humidity in January
Average rainfall in January
Average rainfall days in January
Average snowfall in January
Average snowfall days in January
Average daylight in January
Average sunshine in January
Average sunshine days in January
Average UV index in January
Average cloud cover in January
Average visibility in January

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

Weather in January

In January, Great Falls, Montana sees particularly cold temperatures and notable snowfall. With a high of only 32.4°F (0.2°C), it's the chilliest month of the year. Those venturing outside should bundle up to combat the 77% relative humidity. As the town transitions from January to February, expect conditions to remain somewhat stable, with the temperatures moderately increasing. Despite these cold conditions, it is a great opportunity for outdoor activities such as skiing and snowboarding.

Temperature

The advent of January observes an average high-temperature of an icy 32.4°F (0.2°C), nearly identical to December's 30°F (-1.1°C). During January, the average low-temperature is a freezing cold 19.8°F (-6.8°C).

Humidity

The most humid month is January, with an average relative humidity of 77%.

Rainfall

In January, the rain falls for 3.6 days. Throughout January, 0.2" (5mm) of precipitation is accumulated. Throughout the year, there are 68.2 rainfall days, and 4.49" (114mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. In Great Falls, in January, during 7.1 snowfall days, 1.46" (37mm) of snow is typically accumulated. In Great Falls, Montana, 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 in Great Falls is 8h and 58min.
On the first day of January, 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 5:24 pm MST.

Sunshine

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

UV index

The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The UV index of 2 during January leads to these advisories:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.

Updated: Jun 4, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in January?

Great Falls in January has an average high-temperature of 32.4°F (0.2°C) and an average low-temperature of 19.8°F (-6.8°C).

What is the most humid month?

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

What is the average humidity in January?

In January, the average relative humidity is 77%.

How many days does it rain in January?

In Great Falls, in January, it is raining for 3.6 days, with typically 0.2" (5mm) of accumulated precipitation.

How many days does it snow in January?

In January, it is snowing for 7.1 days. Throughout January, 1.46" (37mm) of snow is accumulated.

What is the average length of the day in January?

The average day length in January is 8h and 58min.

What time are sunrise and sunset in January?

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, sunrise is at 7:52 am and sunset at 5:24 pm MST.

What are the months with the least sunshine?

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

How long on average sun shines in January in Great Falls?

The average sunshine duration in January is 5.5h.

What is the month with the lowest UV index?

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

What is the UV index intensity in January?

In Great Falls, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to UV radiation.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

30°F -1.1°C

32.4°F 0.2°C

31.6°F -0.2°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

11.7mph 18.8km/h

12.1mph 19.5km/h

10.6mph 17.1km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

22.5

22.4

16.2

Average UV index

Average cloud cover

Average visibility

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).

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).

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).

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%).

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").

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).

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").

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).

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

Average daylight in January: 9h and 0min

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 30min).

Average sunshine in January: 5h and 3min

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).

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).

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).

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).

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).

January weather forecast
Great Falls, MT

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