January weather forecast
Lewistown, MT

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Weather in January

January gifts Lewistown, Montana a surprising blend of icing conditions with the lower temperatures stooping to 16.9°F (-8.4°C) and the maximum being 30.6°F (-0.8°C). The city experiences more snowy days compared to rainy, establishing a frosty yet cardinal winter climate. Icy conditions could influence visibility, even though it averages at about 6 miles. Humidity is more marked as the year begins, making the harsh chill slightly milder. The intertwining nature of snowfall, gusty winds, and moisture in the air reinforces the essence of true winter weather.

Temperature

January in Lewistown registers an average high-temperature of a still freezing cold 30.6°F (-0.8°C), slightly varied from December's 29.1°F (-1.6°C). Lewistown records an average low of 16.9°F (-8.4°C) throughout the nights in January.

Humidity

The average relative humidity in January 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. In Lewistown, during the entire year, the rain falls for 126.2 days and collects up to 17.83" (453mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in January in Lewistown is 9h and 1min.
On the first day of the month, sunrise is at 8:03 am and sunset at 4:38 pm. On the last day of January, in Lewistown, sunrise is at 7:44 am and sunset at 5:18 pm MST.

Sunshine

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

UV index

The months with the lowest UV index in Lewistown are January through April, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily high UV index of 2 during January translates into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. To avoid the Sun's strongest rays, limit exposure around the mid-day period. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
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Frequently asked questions

How cold is January in Lewistown?

In Lewistown, 30.6°F (-0.8°C) is the average high-temperature and 16.9°F (-8.4°C) is the average low-temperature during January.

What is the average humidity in January in Lewistown?

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

How much does it rain in Lewistown in January?

In Lewistown, Montana, during January, the rain falls for 5.4 days and regularly aggregates up to 0.83" (21mm) of precipitation.

How much does it snow in Lewistown in January?

In Lewistown, Montana, in January, during 12.9 snowfall days, 5.47" (139mm) of snow is typically accumulated.

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

The average day length in January is 9h and 1min.

What time are sunrise and sunset in January in Lewistown?

On the first day of January in Lewistown, Montana, sunrise is at 8:03 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 5:18 pm MST.

How many hours of sunshine does Lewistown have in January?

In January, the average sunshine duration in Lewistown, Montana, 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.

How high is the UV index in January in Lewistown?

In January, the average daily maximum UV index in Lewistown, Montana, is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
29.1°F -1.6°C
30.6°F -0.8°C
29.1°F -1.6°C
Average low temperature
16°F -8.9°C
16.9°F -8.4°C
15.3°F -9.3°C
Average pressure
30.12" 765mmHg
30.13" 765mmHg
30.11" 765mmHg
Average wind speed
9.5mph 15.3km/h
9.9mph 15.9km/h
9.1mph 14.6km/h
Average max. wind speed
10.3mph 16.6km/h
10.6mph 17.1km/h
9.7mph 15.6km/h
Average wind speed gusts
17.6mph 28.3km/h
18.6mph 29.9km/h
15.8mph 25.4km/h
Average humidity
77%
78%
79%
Average rainfall
0.71" 18mm
0.83" 21mm
0.98" 25mm
Average rainfall days
6
5.4
6.9
Average snowfall
4.88" 124mm
5.47" 139mm
6.65" 169mm
Average snowfall days
13.5
12.9
15.2
Average daylight
8h 4min
9h 0min
10h 2min
Average sunshine
5h 4min
5h 4min
5h 3min
Average sunshine days
16
15.9
11.8
Average UV index
2
2
2
Average cloud cover
41%
39%
45%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

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).
The 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"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
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").
The 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).
The 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 and 0min

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 4min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 30min).

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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).
The 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

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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Lewistown, Montana, USA

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