January weather forecastMammoth, MT
January
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 9h and 12min
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 12min
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: 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: 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: 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: 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).
