January weather forecast
Mammoth, MT

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Weather in January

January, the same as December, in Mammoth, Montana, is a freezing cold winter month, with an average temperature ranging between max 28.8°F (-1.8°C) and min 13.6°F (-10.2°C).

Temperature

With the onset of January, a modest change to a still subzero cold 28.8°F (-1.8°C) from December's 26.4°F (-3.1°C) is noted in high-temperature. Nighttime temperature lowers to an average of 13.6°F (-10.2°C) in January.

Humidity

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

Rainfall

January is the month with the least rainfall. Rain falls for 11.7 days and accumulates 0.59" (15mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Mammoth, during January, snow falls for 4.5 days and regularly aggregates up to 0.75" (19mm) of snow. In Mammoth, during the entire year, snow falls for 20.8 days and aggregates up to 5.12" (130mm) of snow.

Daylight

In January, the average length of the day is 9h and 10min.
On the first day of January in Mammoth, sunrise is at 8:08 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 5:32 pm MST.

Sunshine

In Mammoth, the average sunshine in January is 6.2h.

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 value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: An average maximum UV index of 2 in January leads to these recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. 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. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.

Frequently asked questions

How cold is January in Mammoth?

Mammoth in January has an average high-temperature of 28.8°F (-1.8°C) and an average low-temperature of 13.6°F (-10.2°C).

What is the most humid month?

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

What is the average humidity in January in Mammoth?

The average relative humidity in January is 85%.

What is the driest month?

The month with the least rainfall is January, when the rain falls for 11.7 days and typically collects 0.59" (15mm) of precipitation.

How many days does it rain in January in Mammoth?

In January, the rain falls for 11.7 days. Throughout January, 0.59" (15mm) of precipitation is accumulated.

How much does it snow in January?

In Mammoth, during January, snow falls for 4.5 days and regularly aggregates up to 0.75" (19mm) of snow.

How many hours of daylight does Mammoth have in January?

In January, the average day length is 9h and 10min.

When is the sunrise / sunset in January?

In January, on the first day of the month, sunrise is at 8:08 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:50 am and sunset at 5:32 pm MST.

How long on average sun shines in January?

In January, the average sunshine duration is 6.2h.

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

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

What is the UV index intensity in January?

The average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health 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
Mammoth, MT

Average temperature in January - Mammoth, MT
  • Average high temperature in January: 28.8°F

The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is December (26.4°F).

  • Average low temperature in January: 13.6°F

The month with the highest average low temperature is July (47.7°F).
The coldest month (with the lowest average low temperature) is December (11.3°F).

Average pressure in January
Mammoth, MT

Average pressure in January - Mammoth, MT
  • Average pressure in January: 30.23"Hg

The month with the highest atmospheric pressure is January (30.23"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in January
Mammoth, MT

Average wind speed in January - Mammoth, MT
  • Average wind speed in January: 6.2mph

The windiest month (with the highest average wind speed) is November (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).

Average humidity in January
Mammoth, MT

Average humidity in January - Mammoth, 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%).

Average rainfall in January
Mammoth, MT

Average rainfall in January - Mammoth, MT
  • Average rainfall in January: 0.59"

The wettest month (with the highest rainfall) is May (1.85").
The driest month (with the least rainfall) is January (0.59").

Average rainfall days in January
Mammoth, MT

Average rainfall days in January - Mammoth, MT
  • Average rainfall days in January: 11.7 days

The month with the highest number of rainy days is April (18.6 days).
The month with the least rainy days is August (8.6 days).

Average snowfall in January
Mammoth, MT

Average snowfall in January - Mammoth, MT
  • Average snowfall in January: 0.75"

The month with the highest snowfall is February (1.81").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in January
Mammoth, MT

Average snowfall days in January - Mammoth, MT
  • Average snowfall days in January: 4.5 days

The month with the highest number of snowfall days is February (6.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in January /
Average sunshine in January
Mammoth, MT

Average daylight in January / Average sunshine in January - Mammoth, MT
  • Average daylight in January: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in January: 6h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

Average sunshine days in January
Mammoth, MT

Average sunshine days in January - Mammoth, MT
  • Average sunshine days in January: 14.8 days

The month with the most sunshine days is July (17.8 days).
The month with the least sunshine days is April (7.8 days).

Average UV index in January
Mammoth, MT

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

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).

Average cloud cover in January
Mammoth, MT

Average cloud cover in January - Mammoth, MT
  • Average cloud cover in January: 38

The month with the most cloud cover is February (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 14).

Average visibility in January
Mammoth, MT

Average visibility in January - Mammoth, 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).

Mammoth, Montana, USA

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