December weather forecastFort Shaw, MT
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Fort Shaw, Montana, with temperature in the range of an average high of 29.5°F (-1.4°C) and an average low of 17.4°F (-8.1°C).Temperature
In Fort Shaw, the month of December is known for its lowest average temperatures, reaching a high of 29.5°F (-1.4°C) and a low of 17.4°F (-8.1°C).Humidity
In December, the average relative humidity is 77%.Rainfall
In December, the rain falls for 4.9 days. Throughout December, 0.67" (17mm) of precipitation is accumulated. Throughout the year, there are 112.8 rainfall days, and 12.95" (329mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. In Fort Shaw, during December, snow falls for 12.4 days and regularly aggregates up to 4.37" (111mm) of snow. Throughout the year, there are 69.4 snowfall days, and 35.35" (898mm) 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 December, sunrise is at 7:54 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 8:14 am and sunset at 4:46 pm MST.
Sunshine
The months with the least sunshine are January and December, with an average of 5.4h of sunshine.UV index
The months with the lowest UV index are January through March, 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 unprotected exposure to Sun's UV rays for average individuals.Note: The daily high UV index of 2 during December translates into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Fort Shaw, MT
- Average high temperature in December: 29.5°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is December (29.5°F).
- Average low temperature in December: 17.4°F
The month with the highest average low temperature is August (56.7°F).
The coldest month (with the lowest average low temperature) is December (17.4°F).
Average pressure in December
Fort Shaw, MT
- Average pressure in December: 30.14"Hg
The months with the highest atmospheric pressure are January and December (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in December
Fort Shaw, MT
- Average wind speed in December: 10.4mph
The windiest months (with the highest average wind speed) are January and November (10.7mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in December
Fort Shaw, MT
- Average humidity in December: 77%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is August (41%).
Average rainfall in December
Fort Shaw, MT
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is June (2.05").
The driest months (with the least rainfall) are January and July (0.63").
Average rainfall days in December
Fort Shaw, MT
- Average rainfall days in December: 4.9 days
The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in December
Fort Shaw, MT
- Average snowfall in December: 4.37"
The month with the highest snowfall is February (6.34").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Fort Shaw, MT
- Average snowfall days in December: 12.4 days
The month with the highest number of snowfall days is February (14.4 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Fort Shaw, 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 24min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days in December
Fort Shaw, MT
- Average sunshine days in December: 17.7 days
The month with the most sunshine days is September (18.8 days).
The month with the least sunshine days is April (10.3 days).
Average UV index in December
Fort Shaw, 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
Fort Shaw, MT
- Average cloud cover in December: 43
The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 14).
Average visibility in December
Fort Shaw, 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).
