Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December is the coldest month, with an average high-temperature of 25.7°F (-3.5°C) and an average low-temperature of 12.6°F (-10.8°C).Humidity
The average relative humidity in December in Garrison is 87%.Rainfall
In Garrison, Montana, in December, it is raining for 9 days, with typically 1.06" (27mm) of accumulated precipitation. 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 in Garrison are January through June, September through December. In December, it is snowing for 17.2 days. Throughout December, 8.62" (219mm) of snow is accumulated. Throughout the year, in Garrison, there are 125.4 snowfall days, and 77.91" (1979mm) of snow is accumulated.Daylight
With an average of 8h and 36min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:55 am and sunset at 4:45 pm. On the last day of December, in Garrison, Montana, sunrise is at 8:15 am and sunset at 4:54 pm MST.
Sunshine
In December, the average sunshine in Garrison is 5.7h.UV index
The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 2 suggests these recommendations:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Frequently asked questions
What are the coldest months in Garrison?
How cold is it in Garrison in December?
What is the average humidity in December in Garrison?
How many days does it rain in December in Garrison?
How many days does it snow in December in Garrison?
What is the month with the shortest days in Garrison?
How many hours of daylight does Garrison have in December?
When are sunrise and sunset in December in Garrison?
How many hours of sunshine does Garrison have in December?
What are the months with the lowest UV index in Garrison?
What is the UV index intensity in December in Garrison?
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 4min
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 4min
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).
Garrison, Montana, USA
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