December weather forecastGarrison, MT
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Garrison, Montana, with an average temperature varying between 12.6°F (-10.8°C) and 25.7°F (-3.5°C).Temperature
In Garrison, Montana, the lowest average temperatures are observed in December, with a high of 25.7°F (-3.5°C) and a low of 12.6°F (-10.8°C).Humidity
In December, the average relative humidity is 87%.Rainfall
In Garrison, in December, during 9 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. In Garrison, during the entire year, the rain falls for 122.8 days and collects up to 17.13" (435mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. In Garrison, during December, snow falls for 17.2 days and regularly aggregates up to 8.62" (219mm) of snow. In Garrison, during the entire year, snow falls for 125.4 days and aggregates up to 77.91" (1979mm) of snow.Daylight
With an average of 8h and 36min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:55 am and sunset at 4:45 pm. On the last day of the month, sunrise is at 8:15 am and sunset at 4:54 pm MST.
Sunshine
The average sunshine in December is 5.7h.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 estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the maximum UV index of 2 translates into these guidelines:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Garrison, MT
- Average high temperature in December: 25.7°F
The warmest month (with the highest average high temperature) is July (76.8°F).
The month with the lowest average high temperature is December (25.7°F).
- Average low temperature in December: 12.6°F
The month with the highest average low temperature is August (47.3°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).
Average pressure in December
Garrison, MT
- Average pressure in December: 30.19"Hg
The months with the highest atmospheric pressure are January and December (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Garrison, MT
- Average wind speed in December: 6mph
The windiest months (with the highest average wind speed) are January, April and November (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Garrison, MT
- Average humidity in December: 87%
The months with the highest relative humidity are January and February (88%).
The months with the lowest relative humidity are July and August (49%).
Average rainfall in December
Garrison, MT
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is June (2.52").
The driest month (with the least rainfall) is August (0.67").
Average rainfall days in December
Garrison, MT
- Average rainfall days in December: 9 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is August (7.3 days).
Average snowfall in December
Garrison, MT
- Average snowfall in December: 8.62"
The month with the highest snowfall is February (12.76").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Garrison, MT
- Average snowfall days in December: 17.2 days
The month with the highest number of snowfall days is February (20.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Garrison, MT
- Average daylight in December: 8h and 36min
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 December: 5h and 42min
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).
Average sunshine days in December
Garrison, MT
- Average sunshine days in December: 13.2 days
The month with the most sunshine days is July (21.5 days).
The month with the least sunshine days is April (6.3 days).
Average UV index in December
Garrison, MT
- Average UV index in December: 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 December
Garrison, MT
- Average cloud cover in December: 45
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in December
Garrison, MT
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March and December (4mi).
