January weather forecast
Lewistown, MT

Weather in January

January, the same as December, in Lewistown, Montana, is another subzero cold winter month, with temperature in the range of an average low of 16.9°F (-8.4°C) and an average high of 30.6°F (-0.8°C).

Temperature

In January, the average high-temperature is practically the same as in December - a still subzero cold 30.6°F (-0.8°C). In January, in Lewistown, Montana, the average low-temperature is 16.9°F (-8.4°C).

Humidity

The average relative humidity in Lewistown, Montana, is 78%.

Rainfall

In Lewistown, in January, it is raining for 5.4 days, with typically 0.83" (21mm) of accumulated precipitation. Throughout the year, there are 126.2 rainfall days, and 17.83" (453mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall in Lewistown. In January, in Lewistown, it is snowing for 12.9 days. Throughout January, 5.47" (139mm) of snow is accumulated. In Lewistown, during the entire year, snow falls for 83.4 days, and aggregates up to 45.51" (1156mm) of snow.

Daylight

In Lewistown, the average length of the day in January is 9h.

Sunshine

The average sunshine in January is 5.7h.

UV index

January through April, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. 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.
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FAQ

What is the average humidity in January in Lewistown?

In January, the average relative humidity in Lewistown is 78%.

How many days does it rain in January in Lewistown?

In Lewistown, in January, during 5.4 rainfall days, 0.83" (21mm) of precipitation is typically accumulated.

How many days does it snow in January in Lewistown?

In January, it is snowing for 12.9 days. Throughout January, 5.47" (139mm) of snow is accumulated.

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

In Lewistown, the average length of the day in January is 9h.

How many hours of sunshine does Lewistown have in January?

In Lewistown, the average sunshine in January is 5.7h.

What are the months with the lowest UV index in Lewistown?

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

What is the UV index reading in January in Lewistown?

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

Average temperature in January
Lewistown, MT

Average temperature in January - Lewistown, MT
  • Average high temperature in January: 30.6°F

The warmest month (with the highest average high temperature) is July (78.8°F).
Months with the lowest average high temperature are February and December (29.1°F).

  • Average low temperature in January: 16.9°F

The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is February (15.3°F).

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Average pressure in January
Lewistown, MT

Average pressure in January - Lewistown, 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 (29.85").

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Average wind speed in January
Lewistown, MT

Average wind speed in January - Lewistown, MT
  • Average wind speed in January: 9.9mph

The windiest months (with the highest average wind speed) are January, April and October (9.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).

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Average humidity in January
Lewistown, MT

Average humidity in January - Lewistown, MT
  • Average humidity in January: 78%

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is August (47%).

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Average rainfall in January
Lewistown, MT

Average rainfall in January - Lewistown, MT
  • Average rainfall in January: 0.83"

The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is December (0.71").

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Average rainfall days in January
Lewistown, MT

Average rainfall days in January - Lewistown, MT
  • Average rainfall days in January: 5.4 days

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (5.4 days).

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Average snowfall in January
Lewistown, MT

Average snowfall in January - Lewistown, MT
  • Average snowfall in January: 5.47"

The month with the highest snowfall is April (9.13").
Months with the least snowfall are July and August (0").

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Average snowfall days in January
Lewistown, MT

Average snowfall days in January - Lewistown, MT
  • Average snowfall days in January: 12.9 days

The month with the highest number of snowfall days is February (15.2 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
Lewistown, MT

Average daylight in January / Average sunshine in January - Lewistown, MT
  • Average daylight in January: 9h

The month with the longest days is June (Average daylight: 15.8h).
The month with the shortest days is December (Average daylight: 8.6h).

  • Average sunshine in January: 5.7h

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 5.5h).

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Average sunshine days in January
Lewistown, MT

Average sunshine days in January - Lewistown, MT
  • Average sunshine days in January: 15.9 days

The month with the most sunshine days is September (19.3 days).
The month with the least sunshine days is April (8.3 days).

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Average UV index in January
Lewistown, MT

Average UV index in January - Lewistown, 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, April, October, November and December (UV index 2).

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Average cloud cover in January
Lewistown, MT

Average cloud cover in January - Lewistown, MT
  • Average cloud cover in January: 39

The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 16).

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Average visibility in January
Lewistown, MT

Average visibility in January - Lewistown, 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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