January weather forecast
Roundup, MT

Weather in January

January, the same as December, in Roundup, Montana, is another subzero cold winter month, with an average temperature varying between 18.5°F (-7.5°C) and 31.8°F (-0.1°C).

Temperature

In January, the average high-temperature is practically the same as in December - a still subzero cold 31.8°F (-0.1°C). The average low-temperature, is 18.5°F (-7.5°C).

Humidity

With an average relative humidity of 77%, January is the most humid month.

Rainfall

The month with the least rainfall is January, when the rain falls for 5.6 days and typically collects 0.55" (14mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Roundup. In Roundup, in January, during 10.1 snowfall days, 3.15" (80mm) of snow is typically accumulated. Throughout the year, there are 53.5 snowfall days, and 18.58" (472mm) of snow is accumulated.

Daylight

In January, the average length of the day is 9h and 5min.
On the first day of the month, sunrise is at 7:57 am and sunset at 4:38 pm. On the last day of January, in Roundup, Montana, sunrise is at 7:38 am and sunset at 5:17 pm MST.

Sunshine

In Roundup, the average sunshine in January is 5.3h.

UV index

In Roundup, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the most humid month in Roundup?

The most humid month is January, with an average relative humidity of 77%.

What is the average humidity in January in Roundup?

The average relative humidity in January in Roundup is 77%.

What is the driest month in Roundup?

The month with the least rainfall is January, when the rain falls for 5.6 days and typically collects 0.55" (14mm) of precipitation.

How much does it rain in Roundup in January?

In Roundup, Montana, during January, the rain falls for 5.6 days and regularly aggregates up to 0.55" (14mm) of precipitation.

How many days does it snow in January in Roundup?

In January, in Roundup, it is snowing for 10.1 days. Throughout January, 3.15" (80mm) of snow is accumulated.

How many hours of daylight does Roundup have in January?

The average day length in January in Roundup, Montana, is 9h and 5min.

What time are sunrise and sunset in January in Roundup?

In January, on the first day of the month, sunrise is at 7:57 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:38 am and sunset at 5:17 pm MST.

How many hours of sunshine does Roundup have in January?

In January, the average sunshine duration in Roundup, Montana, is 5.3h.

How high is the UV index in January in Roundup?

The average daily maximum UV index in January in Roundup, Montana, is 2. A UV Index reading of 2, and below, represents a low health risk 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
Roundup, MT

Average temperature in January - Roundup, MT
  • Average high temperature in January: 31.8°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (31.1°F).

  • Average low temperature in January: 18.5°F

The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is February (18°F).

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Average pressure in January
Roundup, MT

Average pressure in January - Roundup, 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 (29.85"Hg).

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Average wind speed in January
Roundup, MT

Average wind speed in January - Roundup, MT
  • Average wind speed in January: 11.2mph

The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (8.5mph).

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Average humidity in January
Roundup, MT

Average humidity in January - Roundup, MT
  • Average humidity in January: 77%

The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (39%).

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Average rainfall in January
Roundup, MT

Average rainfall in January - Roundup, MT
  • Average rainfall in January: 0.55"

The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is January (0.55").

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Average rainfall days in January
Roundup, MT

Average rainfall days in January - Roundup, MT
  • Average rainfall days in January: 5.6 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (4.6 days).

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Average snowfall in January
Roundup, MT

Average snowfall in January - Roundup, MT
  • Average snowfall in January: 3.15"

The month with the highest snowfall is February (3.78").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in January
Roundup, MT

Average snowfall days in January - Roundup, MT
  • Average snowfall days in January: 10.1 days

The month with the highest number of snowfall days is February (11.1 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
Roundup, MT

Average daylight in January / Average sunshine in January - Roundup, MT
  • Average daylight in January: 9h and 5min

The month with the longest days is June (Average daylight: 15h and 45min).
The month with the shortest days is December (Average daylight: 8h and 40min).

  • Average sunshine in January: 5h and 18min

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 12min).

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Average sunshine days in January
Roundup, MT

Average sunshine days in January - Roundup, MT
  • Average sunshine days in January: 18.4 days

The month with the most sunshine days is September (19.5 days).
The month with the least sunshine days is April (12.8 days).

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Average UV index in January
Roundup, MT

Average UV index in January - Roundup, 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).

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Average cloud cover in January
Roundup, MT

Average cloud cover in January - Roundup, MT
  • Average cloud cover in January: 44

The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 16).

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Average visibility in January
Roundup, MT

Average visibility in January - Roundup, 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).

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