January weather forecast and climate
Sweet Grass, MT

January, like December, is another subzero cold winter month in Sweet Grass, Montana, with temperature in the range of an average low of 16.2°F (-8.8°C) and an average high of 28.9°F (-1.7°C).

Temperature

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

Humidity

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

Rainfall

In January, the rain falls for 3.9 days. Throughout January, 0.35" (9mm) of precipitation is 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, Montana, 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 January is 8.8h.

Sunshine

Months with the least sunshine 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 in Sweet Grass. A UV Index of 2, and less, symbolizes a low threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 2 interpret into the following advice:
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. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in January in Sweet Grass?

In Sweet Grass, Montana, in January, 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 in Sweet Grass is January, with an average relative humidity of 79%.

What is the average humidity in January in Sweet Grass?

In January, the average relative humidity in Sweet Grass is 79%.

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

In Sweet Grass, in January, during 3.9 rainfall days, 0.35" (9mm) of precipitation is typically accumulated.

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 is 8.8h.

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

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

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

In January, the average sunshine in Sweet Grass is 5.6h.

What is the month with the lowest UV index in Sweet Grass?

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

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

In January, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV rays.
Average temperature in January - Sweet Grass, MT
  • Average high temperature in January: -1.7°C

The warmest month (with the highest average high temperature) is July (26°C).
The month with the lowest average high temperature is December (-2.7°C).

  • Average low temperature in January: -8.8°C

The month with the highest average low temperature is August (12.9°C).
The coldest month (with the lowest average low temperature) is December (-9.3°C).

Average pressure in January - Sweet Grass, MT
  • Average pressure in January: 1020.3mbar

The month with the highest atmospheric pressure is January (1020.3mbar).
The month with the lowest atmospheric pressure is June (1011.5mbar).

Average wind speed in January - Sweet Grass, MT
  • Average wind speed in January: 19km/h

The windiest month (with the highest average wind speed) is January (19km/h).
The calmest month (with the lowest average wind speed) is August (14.1km/h).

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%).

Average rainfall in January - Sweet Grass, MT
  • Average rainfall in January: 9mm

The wettest month (with the highest rainfall) is June (45mm).
The driest month (with the least rainfall) is July (8mm).

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).

Average snowfall in January - Sweet Grass, MT
  • Average snowfall in January: 58mm

The month with the highest snowfall is February (91mm).
Months with the least snowfall are June, July and August (0mm).

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).

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).

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).

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).

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).

Average visibility in January - Sweet Grass, MT
  • Average visibility in January: 9km

Months with the highest visibility are May, June, July, August, September and October (10km).
Months with the lowest visibility are January, February, March, April, November and December (9km).