January weather forecast
Helena, MT

The State Capital building of Montana in Helena city, set on a beautiful natural park
The State Capital building of Montana in Helena city, set on a beautiful natural park

Weather in January

January, the same as December, in Helena, Montana, is another subzero cold winter month, with an average temperature ranging between max 30.4°F (-0.9°C) and min 16°F (-8.9°C).

Temperature

In January, the average high-temperature is essentially the same as in December - a still subzero cold 30.4°F (-0.9°C). The average low-temperature, in January, is 16°F (-8.9°C).

Humidity

With an average relative humidity of 85%, January is the most humid month.

Rainfall

January and December are months with the least rain in Helena when the rain falls for 8.4 days and typically aggregates up to 0.63" (16mm) of rain.

Snowfall

January through May, September through December are months with snowfall in Helena. In Helena, during January, snow falls for 13.3 days and regularly aggregates up to 4.41" (112mm) of snow. Throughout the year, in Helena, there are 80.4 snowfall days, and 34.88" (886mm) of snow is accumulated.

Daylight

In January, the average length of the day is 9h and 4min.
On the first day of January, sunrise is at 8:12 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:52 am and sunset at 5:30 pm MST.

Sunshine

The month with the least sunshine is January, with an average of 5.6h of sunshine.

UV index

In Helena, the average daily maximum UV index in January is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 2 in January transform into the following instructions:
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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the most humid month in Helena?

With an average relative humidity of 85%, January is the most humid month.

What is the average humidity in January in Helena?

In January, the average relative humidity is 85%.

What is the driest month in Helena?

The months with the least rainfall in Helena, Montana, are January and December Rain falls for 8.4 days and accumulates 0.63" (16mm) of rain.

How much does it rain in Helena in January?

In January, in Helena, Montana, the rain falls for 8.4 days. Throughout January, 0.63" (16mm) of precipitation is accumulated.

How much does it snow in Helena in January?

In Helena, in January, snow falls for 13.3 days, with typically accumulated 4.41" (112mm) of snow.

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

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

When is the sunrise / sunset in January in Helena?

In January, on the first day of the month, sunrise is at 8:12 am and sunset at 4:51 pm. On the last day of the month, in Helena, sunrise is at 7:52 am and sunset at 5:30 pm MST.

What is the month with the least sunshine in Helena?

The month with the least sunshine in Helena, Montana, is January, with an average of 5.6h of sunshine.

How long on average sun shines in January in Helena?

The average sunshine duration in January is 5.6h.

What is the UV index reading in January in Helena?

In January, the average daily maximum UV index in Helena, Montana, is 2. A UV Index value of 2, and less, symbolizes 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
Helena, MT

Average temperature in January - Helena, MT
  • Average high temperature in January: 30.4°F

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (27.7°F).

  • Average low temperature in January: 16°F

The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is December (14.2°F).

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Average pressure in January
Helena, MT

Average pressure in January - Helena, MT
  • Average pressure in January: 30.18"Hg

The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

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Average wind speed in January
Helena, MT

Average wind speed in January - Helena, MT
  • Average wind speed in January: 7mph

The windiest month (with the highest average wind speed) is November (7.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in January
Helena, MT

Average humidity in January - Helena, MT
  • Average humidity in January: 85%

The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are July and August (46%).

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Average rainfall in January
Helena, MT

Average rainfall in January - Helena, MT
  • Average rainfall in January: 0.63"

The wettest month (with the highest rainfall) is June (2.01").
The driest months (with the least rainfall) are January and December (0.63").

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Average rainfall days in January
Helena, MT

Average rainfall days in January - Helena, MT
  • Average rainfall days in January: 8.4 days

The month with the highest number of rainy days is May (15.8 days).
The month with the least rainy days is November (7 days).

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Average snowfall in January
Helena, MT

Average snowfall in January - Helena, MT
  • Average snowfall in January: 4.41"

The month with the highest snowfall is February (6.18").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in January
Helena, MT

Average snowfall days in January - Helena, MT
  • Average snowfall days in January: 13.3 days

The month with the highest number of snowfall days is February (16.2 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
Helena, MT

Average daylight in January / Average sunshine in January - Helena, MT
  • Average daylight in January: 9h and 4min

The month with the longest days is June (Average daylight: 15h and 46min).
The month with the shortest days is December (Average daylight: 8h and 38min).

  • Average sunshine in January: 5h and 36min

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).

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Average sunshine days in January
Helena, MT

Average sunshine days in January - Helena, MT
  • Average sunshine days in January: 15.2 days

The month with the most sunshine days is July (20.5 days).
The month with the least sunshine days is April (9.8 days).

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Average UV index in January
Helena, MT

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

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).

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Average cloud cover in January
Helena, MT

Average cloud cover in January - Helena, MT
  • Average cloud cover in January: 42

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 15).

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Average visibility in January
Helena, MT

Average visibility in January - Helena, MT
  • Average visibility in January: 5mi

The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).

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