December weather forecastFort Smith, MT
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Fort Smith, Montana, with temperature in the range of an average high of 29.7°F (-1.3°C) and an average low of 16.9°F (-8.4°C).Temperature
December, marked by an average high-temperature of 29.7°F (-1.3°C) and a low-temperature of 16.9°F (-8.4°C), is the coldest month.Humidity
In Fort Smith, the average relative humidity in December is 74%.Rainfall
December is the month with the least rainfall. Rain falls for 6.3 days and accumulates 0.59" (15mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. In Fort Smith, Montana, during December, snow falls for 12.3 days and regularly aggregates up to 4.37" (111mm) of snow. Throughout the year, there are 66 snowfall days, and 33.07" (840mm) of snow is accumulated.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year in Fort Smith.On the first day of the month, sunrise is at 7:31 am and sunset at 4:30 pm. On the last day of December, sunrise is at 7:50 am and sunset at 4:39 pm MST.
Sunshine
The average sunshine in December in Fort Smith, Montana, is 6h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: In December, the maximum UV index of 1 suggests these recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Fort Smith, MT
- Average high temperature in December: 29.7°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 (29.7°F).
- Average low temperature in December: 16.9°F
The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is February (16.5°F).
Average pressure in December
Fort Smith, MT
- Average pressure in December: 30.13"Hg
The months with the highest atmospheric pressure are January and December (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.86"Hg).
Average wind speed in December
Fort Smith, MT
- Average wind speed in December: 9.4mph
The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in December
Fort Smith, MT
- Average humidity in December: 74%
The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is August (41%).
Average rainfall in December
Fort Smith, MT
- Average rainfall in December: 0.59"
The wettest month (with the highest rainfall) is May (2.01").
The driest month (with the least rainfall) is December (0.59").
Average rainfall days in December
Fort Smith, MT
- Average rainfall days in December: 6.3 days
The month with the highest number of rainy days is May (18 days).
The months with the least rainy days are January and December (6.3 days).
Average snowfall in December
Fort Smith, MT
- Average snowfall in December: 4.37"
The month with the highest snowfall is February (6.85").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Fort Smith, MT
- Average snowfall days in December: 12.3 days
The month with the highest number of snowfall days is February (14.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Fort Smith, MT
- Average daylight in December: 8h and 48min
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 December: 6h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).
Average sunshine days in December
Fort Smith, MT
- Average sunshine days in December: 16.6 days
The month with the most sunshine days is October (16.7 days).
The month with the least sunshine days is May (8.7 days).
Average UV index in December
Fort Smith, MT
- Average UV index in December: 1
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Fort Smith, MT
- Average cloud cover in December: 39
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 14).
Average visibility in December
Fort Smith, 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).
