Great Falls
Montana, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Great Falls, MT

A far view from on top of the vast Missouri River of the City of Lights, Great Falls, Montana, a dusk sky, mirror images in the water
A far view from on top of the vast Missouri River of the City of Lights, Great Falls, Montana, a dusk sky, mirror images in the water
January, like December, in Great Falls, Montana, is a wintry winter month, with average temperature fluctuating between 14.9°F (-9.5°C) and 35.4°F (1.9°C).

Temperature

In Great Falls, the average high-temperature is essentially the same as in December - a still cold 35.4°F (1.9°C). In Great Falls, in January, the average low-temperature is 14.9°F (-9.5°C).

Rainfall

In Great Falls, during January, the rain falls for 6.8 days and regularly aggregates up to 0.5" (13mm) of precipitation. Throughout the year, in Great Falls, Montana, there are 99.9 rainfall days, and 14.8" (374.8mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Great Falls are January through June, August through December.

Daylight

The average length of the day in Great Falls is 9h.

Sunshine

In Great Falls, the average sunshine in January is 4h.

UV index

Months with the lowest UV index are January, November and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health hazard from unprotected exposure to the Sun's UV rays for the average person.
The daily maximum UV index of 1 interpret into the following advice:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in January in Great Falls?

In January, in Great Falls, the average high-temperature is 35.4°F (1.9°C), and the average low-temperature is 14.9°F (-9.5°C).

How many days does it rain in January in Great Falls?

In Great Falls, Montana, in January, during 6.8 rainfall days, 0.5" (13mm) of precipitation is typically accumulated.

How many days does it snow in January in Great Falls?

In Great Falls, in January, during 7.2 snowfall days, 8.6" (218.4mm) of snow is typically accumulated.

What is the average length of the day in January in Great Falls?

In Great Falls, Montana, the average length of the day in January is 9h.

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

In January, the average sunshine in Great Falls is 4h.

What are the months with the lowest UV index in Great Falls?

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Great Falls, Montana.

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

In January, the average daily maximum UV index in Great Falls, Montana, is 1. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV rays.
Average temperature in January - Great Falls, MT
  • Average high temperature in January: 35.5°F

The warmest month (with the highest average high temperature) is July (83.4°F).
The month with the lowest average high temperature is December (34.6°F).

  • Average low temperature in January: 14.9°F

The month with the highest average low temperature is July (51.4°F).
Coldest months (with the lowest average low temperature) are January and December (14.9°F).

Average rainfall in January - Great Falls, MT
  • Average rainfall in January: 0.5"

The wettest month (with the highest rainfall) is June (2.5").
Driest months (with the lowest rainfall) are January and February (0.5").

Average rainfall days in January - Great Falls, MT
  • Average rainfall days in January: 6.8 days

Months with the highest number of rainy days are May and June (11.7 days).
The month with the lowest number of rainy days is October (6.6 days).

Average snowfall in January - Great Falls, MT
  • Average snowfall in January: 8.6"

The month with the highest snowfall is March (11.9").
The month with the lowest snowfall is July (0").

Average snowfall days in January - Great Falls, MT
  • Average snowfall days in January: 7.2 days

The month with the highest number of snowfall days is March (7.8 days).
The month with the lowest number of snowfall days is July (0 days).

Average daylight in January / Average sunshine in January - Great Falls, MT
  • Average daylight in January: 9h

The month with the longest days is June (Average daylight: 15.9h).
The month with shortest days is December (Average daylight: 8.5h).

  • Average sunshine in January: 4h

The month with most sunshine is July (Average sunshine: 12.2h).
The month with least sunshine is December (Average sunshine: 3.4h).

Average UV index in January - Great Falls, MT
  • Average UV index in January: 1

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).