January weather forecast
Sumatra, MT

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Weather in January

January, like December, is another subzero cold winter month in Sumatra, Montana, with an average temperature varying between 17.4°F (-8.1°C) and 30.9°F (-0.6°C).

Temperature

During January and December, Sumatra experiences its lowest temperatures, averaging a high-temperature of 30.9°F (-0.6°C).

Humidity

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

Rainfall

January, November and December are months with the least rain when the rain falls for 4.2 days and typically aggregates up to 0.47" (12mm) of rain.

Snowfall

Months with snowfall are January through May, September through December. In Sumatra, in January, snow falls for 9.5 days, with typically accumulated 2.52" (64mm) of snow. Throughout the year, there are 47 snowfall days, and 15.83" (402mm) of snow is accumulated.

Daylight

The average length of the day in January in Sumatra is 9h and 4min.
On the first day of January in Sumatra, sunrise is at 7:54 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 5:11 pm MST.

Sunshine

In January, the average sunshine is 5.4h.

UV index

In Sumatra, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the average person.
Note: An average maximum UV index of 2 in January leads to these recommendations:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Updated: Feb 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest in Sumatra?

The temperature hits its lowest levels in January and December, recording an average high-temperature of 30.9°F (-0.6°C).

How cold is it in Sumatra in January?

The high-temperature, in January, in Sumatra, is 30.9°F (-0.6°C), while the low-temperature averages to 17.4°F (-8.1°C).

What is the most humid month in Sumatra?

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

What is the average humidity in January in Sumatra?

The average relative humidity in January in Sumatra is 79%.

What is the driest month in Sumatra?

The months with the least rainfall in Sumatra, Montana, are January, November and December Rain falls for 4.2 days and accumulates 0.47" (12mm) of rain.

How much does it rain in Sumatra in January?

In Sumatra, in January, during 4.2 rainfall days, 0.47" (12mm) of precipitation is typically accumulated.

How much does it snow in Sumatra in January?

In Sumatra, Montana, in January, snow falls for 9.5 days, with typically accumulated 2.52" (64mm) of snow.

What is the average length of the day in January in Sumatra?

In January, the average day length is 9h and 4min.

What time are sunrise and sunset in January in Sumatra?

In January, on the first day of the month, sunrise is at 7:54 am and sunset at 4:32 pm. On the last day of the month, in Sumatra, sunrise is at 7:35 am and sunset at 5:11 pm MST.

How many hours of sunshine does Sumatra have in January?

In January, the average sunshine duration in Sumatra is 5.4h.

What is the UV index reading in January in Sumatra?

In Sumatra, the average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from exposure to Sun's UV rays.
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
Sumatra, MT

Average temperature in January - Sumatra, MT
  • Average high temperature in January: 30.9°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The months with the lowest average high temperature are January and December (30.9°F).

  • Average low temperature in January: 17.4°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

Average pressure in January
Sumatra, MT

Average pressure in January - Sumatra, MT
  • Average pressure in January: 30.13"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).

Average wind speed in January
Sumatra, MT

Average wind speed in January - Sumatra, MT
  • Average wind speed in January: 9.8mph

The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is July (8.2mph).

Average humidity in January
Sumatra, MT

Average humidity in January - Sumatra, 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 (38%).

Average rainfall in January
Sumatra, MT

Average rainfall in January - Sumatra, MT
  • Average rainfall in January: 0.47"

The wettest month (with the highest rainfall) is May (1.81").
The driest months (with the least rainfall) are January, November and December (0.47").

Average rainfall days in January
Sumatra, MT

Average rainfall days in January - Sumatra, MT
  • Average rainfall days in January: 4.2 days

The month with the highest number of rainy days is May (13.7 days).
The month with the least rainy days is February (3.8 days).

Average snowfall in January
Sumatra, MT

Average snowfall in January - Sumatra, MT
  • Average snowfall in January: 2.52"

The month with the highest snowfall is February (3.74").
The months with the least snowfall are June, July and August (0").

Average snowfall days in January
Sumatra, MT

Average snowfall days in January - Sumatra, MT
  • Average snowfall days in January: 9.5 days

The month with the highest number of snowfall days is February (10.3 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in January /
Average sunshine in January
Sumatra, MT

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

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in January: 5h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 5h and 18min).

Average sunshine days in January
Sumatra, MT

Average sunshine days in January - Sumatra, MT
  • Average sunshine days in January: 18.5 days

The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is April (14.2 days).

Average UV index in January
Sumatra, MT

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

The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in January
Sumatra, MT

Average cloud cover in January - Sumatra, MT
  • Average cloud cover in January: 43

The month with the most cloud cover is February (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 15).

Average visibility in January
Sumatra, MT

Average visibility in January - Sumatra, 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).

Sumatra, Montana, USA

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