January weather forecast
Grantsdale, MT

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Weather in January

January, like December, is another subzero cold winter month in Grantsdale, Montana, with temperature in the range of an average low of 16.2°F (-8.8°C) and an average high of 28.8°F (-1.8°C).

Temperature

With January's arrival, Grantsdale notes an average high-temperature of a still freezing cold 28.8°F (-1.8°C), closely following the trend of the preceding month. In the month of January, Grantsdale records a consistent average low-temperature of 16.2°F (-8.8°C).

Humidity

January is the most humid month in Grantsdale, Montana, with an average relative humidity of 89%.

Rainfall

In January, in Grantsdale, Montana, the rain falls for 11.9 days. Throughout January, 2.05" (52mm) of precipitation is accumulated. In Grantsdale, during the entire year, the rain falls for 163.6 days and collects up to 20.83" (529mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. In Grantsdale, in January, snow falls for 18.6 days, with typically accumulated 11.89" (302mm) of snow. Throughout the year, in Grantsdale, there are 101.1 snowfall days, and 59.17" (1503mm) of snow is accumulated.

Daylight

In January, the average length of the day is 9h and 7min.
On the first day of the month, sunrise is at 8:19 am and sunset at 5:00 pm. On the last day of January, sunrise is at 8:00 am and sunset at 5:39 pm MST.

Sunshine

The months with the least sunshine in Grantsdale are January and December, with an average of 5.4h of sunshine.

UV index

The average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 2 during January translates into the following guidance:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Experience reduced UV exposure by about half when donning a wide-brim hat. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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Frequently asked questions

How cold is it in Grantsdale in January?

In Grantsdale, in January, the average high-temperature is 28.8°F (-1.8°C), and the average low-temperature is 16.2°F (-8.8°C).

What is the most humid month in Grantsdale?

January is the most humid month in Grantsdale, Montana, with an average relative humidity of 89%.

What is the average humidity in January in Grantsdale?

The average relative humidity in January is 89%.

How many days does it rain in January in Grantsdale?

In Grantsdale, Montana, in January, during 11.9 rainfall days, 2.05" (52mm) of precipitation is typically accumulated.

How much does it snow in Grantsdale in January?

In Grantsdale, during January, snow falls for 18.6 days and regularly aggregates up to 11.89" (302mm) of snow.

How many hours of daylight does Grantsdale have in January?

The average day length in January in Grantsdale, Montana, is 9h and 7min.

When are sunrise and sunset in January in Grantsdale?

In January, on the first day of the month, sunrise is at 8:19 am and sunset at 5:00 pm. On the last day of the month, in Grantsdale, Montana, sunrise is at 8:00 am and sunset at 5:39 pm MST.

What are the months with the least sunshine in Grantsdale?

The months with the least sunshine in Grantsdale, Montana, are January and December, with an average of 5.4h of sunshine.

How many hours of sunshine does Grantsdale have in January?

In January, the average sunshine duration is 5.4h.

How high is the UV index in January in Grantsdale?

The average daily maximum UV index in January in Grantsdale, Montana, is 2. A UV Index estimate of 2, and below, represents a low health threat from unprotected exposure to UV radiation.
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
Grantsdale, MT

Average temperature in January - Grantsdale, MT
  • Average high temperature in January: 28.8°F

The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is December (26.8°F).

  • Average low temperature in January: 16.2°F

The month with the highest average low temperature is August (46.9°F).
The coldest month (with the lowest average low temperature) is December (14°F).

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Average pressure in January
Grantsdale, MT

Average pressure in January - Grantsdale, MT
  • Average pressure in January: 30.21"Hg

The month with the highest atmospheric pressure is January (30.21"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in January
Grantsdale, MT

Average wind speed in January - Grantsdale, MT
  • Average wind speed in January: 5.3mph

The windiest month (with the highest average wind speed) is January (5.3mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).

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Average humidity in January
Grantsdale, MT

Average humidity in January - Grantsdale, MT
  • Average humidity in January: 89%

The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (50%).

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Average rainfall in January
Grantsdale, MT

Average rainfall in January - Grantsdale, MT
  • Average rainfall in January: 2.05"

The wettest months (with the highest rainfall) are February and April (2.36").
The driest month (with the least rainfall) is August (0.75").

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Average rainfall days in January
Grantsdale, MT

Average rainfall days in January - Grantsdale, MT
  • Average rainfall days in January: 11.9 days

The month with the highest number of rainy days is May (19.5 days).
The month with the least rainy days is July (8 days).

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Average snowfall in January
Grantsdale, MT

Average snowfall in January - Grantsdale, MT
  • Average snowfall in January: 11.89"

The month with the highest snowfall is February (13.03").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in January
Grantsdale, MT

Average snowfall days in January - Grantsdale, MT
  • Average snowfall days in January: 18.6 days

The month with the highest number of snowfall days is February (19.3 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
Grantsdale, MT

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

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in January: 5h and 2min

The months with the most sunshine are July and August (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).

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Average sunshine days in January
Grantsdale, MT

Average sunshine days in January - Grantsdale, MT
  • Average sunshine days in January: 10.2 days

The month with the most sunshine days is July (18.9 days).
The month with the least sunshine days is February (5.6 days).

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Average UV index in January
Grantsdale, MT

Average UV index in January - Grantsdale, MT
  • Average UV index in January: 2

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

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Average cloud cover in January
Grantsdale, MT

Average cloud cover in January - Grantsdale, MT
  • Average cloud cover in January: 48

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in January
Grantsdale, MT

Average visibility in January - Grantsdale, MT
  • Average visibility in January: 4mi

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

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Grantsdale, Montana, USA

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