December weather forecastGreat Falls, MT
December
Weather in December
December brings in the cold winter weather and frigid temperatures. Reaching only 30°F (-1.1°C), it's one of the chilliest periods in Great Falls, Montana. The anticipated weather shift signifies a further drop in temperature as the new year approaches. Residents and travelers adapt to cold weather activities, including ice skating, snow filtering and visiting local holiday markets. Even in the biting cold, the festive spirit makes December a memorable time.Temperature
December is the coldest month, exhibiting average temperatures of 30°F (-1.1°C) at the peak and 18.3°F (-7.6°C) at the base.Humidity
The average relative humidity in December is 76%.Rainfall
December is the month with the least rainfall. Rain falls for 2.7 days and accumulates 0.16" (4mm) of precipitation.Snowfall
Months with snowfall in Great Falls are January through May, September through December. In December, it is snowing for 7.9 days. Throughout December, 1.06" (27mm) of snow is accumulated. Throughout the year, there are 45.4 snowfall days, and 11.61" (295mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 30min of daylight.On the first day of the month, sunrise is at 7:52 am and sunset at 4:36 pm. On the last day of December, sunrise is at 8:12 am and sunset at 4:44 pm MST.
Sunshine
The months with the least sunshine are January, February and December, with an average of 5.5h of sunshine.UV index
January through March, October through December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.Note: A typical high UV index of 2 in December suggests the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Great Falls, MT
- Average high temperature in December: 30°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (30°F).
- Average low temperature in December: 18.3°F
The month with the highest average low temperature is August (57.7°F).
The coldest months (with the lowest average low temperature) are February and December (18.3°F).
Average pressure in December
Great Falls, MT
- Average pressure in December: 30.13"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Great Falls, MT
- Average wind speed in December: 11mph
The windiest month (with the highest average wind speed) is November (11.4mph).
The calmest month (with the lowest average wind speed) is August (7.7mph).
Average humidity in December
Great Falls, MT
- Average humidity in December: 76%
The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (40%).
Average rainfall in December
Great Falls, MT
- Average rainfall in December: 0.16"
The wettest month (with the highest rainfall) is June (0.87").
The driest month (with the least rainfall) is December (0.16").
Average rainfall days in December
Great Falls, MT
- Average rainfall days in December: 2.7 days
The month with the highest number of rainy days is April (9.9 days).
The month with the least rainy days is December (2.7 days).
Average snowfall in December
Great Falls, MT
- Average snowfall in December: 1.06"
The month with the highest snowfall is February (2.09").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Great Falls, MT
- Average snowfall days in December: 7.9 days
The month with the highest number of snowfall days is February (10 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Great Falls, MT
- Average daylight in December: 8h and 30min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in December: 5h and 30min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 30min).
Average sunshine days in December
Great Falls, MT
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is July (26.1 days).
The months with the least sunshine days are February and April (16.2 days).
Average UV index in December
Great Falls, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in December
Great Falls, MT
- Average cloud cover in December: 42
The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in December
Great Falls, MT
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
