January weather forecast and climate
Boulder, MT

Weather in January

January, like December, is another subzero cold winter month in Boulder, Montana, with average temperature ranging between max 29.7°F (-1.3°C) and min 14.5°F (-9.7°C).

Temperature

In January, the average high-temperature is essentially the same as in December - a still freezing cold 29.7°F (-1.3°C). The average low-temperature, in January, is 14.5°F (-9.7°C).

Humidity

The most humid month in Boulder is January, with an average relative humidity of 86%.

Rainfall

In Boulder, Montana,, it is raining for 7.9 days, with typically 0.83" (21mm) of accumulated precipitation. In Boulder, during the entire year, the rain falls for 133.7 days and collects up to 16.38" (416mm) of precipitation.

Snowfall

Months with snowfall in Boulder, Montana, are January through June, September through December. In January, in Boulder, it is snowing for 16.3 days. Throughout January, 6.57" (167mm) of snow is accumulated. Throughout the year, there are 105.8 snowfall days, and 55.12" (1400mm) of snow is accumulated.

Daylight

In Boulder, the average length of the day is 9.1h.

Sunshine

January and December, with an average of 5.6h of sunshine, are months with the least sunshine in Boulder.

UV index

In Boulder, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 2 transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. 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 Boulder?

January is the most humid month in Boulder, with an average relative humidity of 86%.

What is the average humidity in January in Boulder?

The average relative humidity in January in Boulder, Montana, is 86%.

How many days does it rain in January in Boulder?

In Boulder, in January, during 7.9 rainfall days, 0.83" (21mm) of precipitation is typically accumulated.

How much does it snow in Boulder in January?

In Boulder, in January, snow falls for 16.3 days, with typically accumulated 6.57" (167mm) of snow.

How many hours of daylight does Boulder have in January?

In January, the average length of the day in Boulder is 9.1h.

What is the month with the least sunshine in Boulder?

January and December, with an average of 5.6h of sunshine, are months with the least sunshine in Boulder, Montana.

How long on average sun shines in January in Boulder?

In Boulder, the average sunshine in January is 5.6h.

What is the UV index intensity in January in Boulder?

The average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation.

Average temperature in January
Boulder, MT

Average temperature in January - Boulder, MT
  • Average high temperature in January: 29.7°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (27°F).

  • Average low temperature in January: 14.5°F

The month with the highest average low temperature is August (48.6°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).

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Average pressure in January
Boulder, MT

Average pressure in January - Boulder, MT
  • Average pressure in January: 30.19"

The month with the highest atmospheric pressure is January (30.19").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in January
Boulder, MT

Average wind speed in January - Boulder, MT
  • Average wind speed in January: 6.5mph

The windiest months (with the highest average wind speed) are January and November (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).

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Average humidity in January
Boulder, MT

Average humidity in January - Boulder, MT
  • Average humidity in January: 86%

The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (46%).

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Average rainfall in January
Boulder, MT

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

The wettest month (with the highest rainfall) is June (2.68").
The driest month (with the least rainfall) is December (0.79").

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Average rainfall days in January
Boulder, MT

Average rainfall days in January - Boulder, MT
  • Average rainfall days in January: 7.9 days

The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is November (7.5 days).

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Average snowfall in January
Boulder, MT

Average snowfall in January - Boulder, MT
  • Average snowfall in January: 6.57"

The month with the highest snowfall is February (9.72").
Months with the least snowfall are July and August (0").

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Average snowfall days in January
Boulder, MT

Average snowfall days in January - Boulder, MT
  • Average snowfall days in January: 16.3 days

The month with the highest number of snowfall days is February (18 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
Boulder, MT

Average daylight in January / Average sunshine in January - Boulder, MT
  • Average daylight in January: 9.1h

The month with the longest days is June (Average daylight: 15.7h).
The month with the shortest days is December (Average daylight: 8.7h).

  • Average sunshine in January: 5.6h

The month with the most sunshine is July (Average sunshine: 11.7h).
Months with the least sunshine are January and December (Average sunshine: 5.6).

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Average sunshine days in January
Boulder, MT

Average sunshine days in January - Boulder, MT
  • Average sunshine days in January: 14.3 days

The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is February (8.5 days).

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Average UV index in January
Boulder, MT

Average UV index in January - Boulder, 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
Boulder, MT

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

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 15).

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Average visibility in January
Boulder, MT

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

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

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