January weather forecast and climate
Sweet Grass, MT

Weather in January

January, like December, is a freezing cold winter month in Sweet Grass, Montana, with average temperature fluctuating between 28.9°F (-1.7°C) and 16.2°F (-8.8°C).

Temperature

In January, the average high-temperature is practically the same as in December - a still subzero cold 28.9°F (-1.7°C). In Sweet Grass, in January, the average low-temperature is 16.2°F (-8.8°C).

Humidity

January is the most humid month, with an average relative humidity of 79%.

Rainfall

In Sweet Grass, during 3.9 rainfall days, 0.35" (9mm) of precipitation is typically accumulated. Throughout the year, there are 70.4 rainfall days, and 8.46" (215mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. In January, it is snowing for 8.8 days. Throughout January, 2.28" (58mm) of snow is accumulated. In Sweet Grass, during the entire year, snow falls for 54.3 days, and aggregates up to 19.49" (495mm) of snow.

Daylight

The average length of the day in Sweet Grass is 8.8h.

Sunshine

Months with the least sunshine in Sweet Grass are January and December, with an average of 5.6h of sunshine.

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 estimate of 2, and below, represents a minimal health hazard from the exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 2 transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in January in Sweet Grass?

In January, in Sweet Grass, Montana, the average high-temperature is 28.9°F (-1.7°C), and the average low-temperature is 16.2°F (-8.8°C).

What is the most humid month in Sweet Grass?

The most humid month is January, with an average relative humidity of 79%.

What is the average humidity in January in Sweet Grass?

The average relative humidity in January is 79%.

How many days does it rain in January in Sweet Grass?

In Sweet Grass, Montana, in January, it is raining for 3.9 days, with typically 0.35" (9mm) of accumulated precipitation.

How much does it snow in Sweet Grass in January?

In Sweet Grass, in January, during 8.8 snowfall days, 2.28" (58mm) of snow is typically accumulated.

What is the average length of the day in January in Sweet Grass?

In January, the average length of the day in Sweet Grass is 8.8h.

What is the month with the least sunshine in Sweet Grass?

January and December, with an average of 5.6h of sunshine, are months with the least sunshine in Sweet Grass.

How long on average sun shines in January in Sweet Grass?

The average sunshine in January in Sweet Grass is 5.6h.

What are the months with the lowest UV index in Sweet Grass?

Months with the lowest UV index in Sweet Grass are January through March, October through December, with an average maximum UV index of 2.

How high is the UV index in January in Sweet Grass?

In January, the average daily maximum UV index in Sweet Grass is 2. A UV Index value of 2, and less, symbolizes a low health threat from the exposure to the Sun's UV rays.

Average temperature in January
Sweet Grass, MT

Average temperature in January - Sweet Grass, MT
  • Average high temperature in January: 28.9°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (27.1°F).

  • Average low temperature in January: 16.2°F

The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (15.3°F).

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Average pressure in January
Sweet Grass, MT

Average pressure in January - Sweet Grass, MT
  • Average pressure in January: 30.13"

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed in January
Sweet Grass, MT

Average wind speed in January - Sweet Grass, MT
  • Average wind speed in January: 11.8mph

The windiest month (with the highest average wind speed) is January (11.8mph).
The calmest months (with the lowest average wind speed) are July and August (8.8mph).

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Average humidity in January
Sweet Grass, MT

Average humidity in January - Sweet Grass, MT
  • Average humidity in January: 79%

The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (43%).

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Average rainfall in January
Sweet Grass, MT

Average rainfall in January - Sweet Grass, MT
  • Average rainfall in January: 0.35"

The wettest month (with the highest rainfall) is June (1.77").
The driest month (with the least rainfall) is July (0.31").

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Average rainfall days in January
Sweet Grass, MT

Average rainfall days in January - Sweet Grass, MT
  • Average rainfall days in January: 3.9 days

The month with the highest number of rainy days is May (10.4 days).
The month with the least rainy days is November (2.6 days).

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Average snowfall in January
Sweet Grass, MT

Average snowfall in January - Sweet Grass, MT
  • Average snowfall in January: 2.28"

The month with the highest snowfall is February (3.58").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in January
Sweet Grass, MT

Average snowfall days in January - Sweet Grass, MT
  • Average snowfall days in January: 8.8 days

The month with the highest number of snowfall days is December (10.2 days).
Months with the least snowfall days are July and August (0 days).

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Average daylight in January /
Average sunshine in January
Sweet Grass, MT

Average daylight in January / Average sunshine in January - Sweet Grass, MT
  • Average daylight in January: 8.8h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.3h).

  • Average sunshine in January: 5.6h

The month with the most sunshine is July (Average sunshine: 12h).
Months with the least sunshine are January and December (Average sunshine: 5.6).

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Average sunshine days in January
Sweet Grass, MT

Average sunshine days in January - Sweet Grass, MT
  • Average sunshine days in January: 21.1 days

The month with the most sunshine days is July (23.5 days).
The month with the least sunshine days is April (17.4 days).

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Average UV index in January
Sweet Grass, MT

Average UV index in January - Sweet Grass, MT
  • Average UV index in January: 2

The month with the highest UV index is July (UV index 6).
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
Sweet Grass, MT

Average cloud cover in January - Sweet Grass, MT
  • Average cloud cover in January: 40

The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 15).

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Average visibility in January
Sweet Grass, MT

Average visibility in January - Sweet Grass, MT
  • Average visibility in January: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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