December weather forecastDillon, MT
December
Weather in December
December brings with it the full impact of winter in Dillon with temperatures hitting annual lows. Snowfall becomes a routine occurrence, adding to the festive ambiance of this holiday season. With 4.45" (113mm) of snow adorning the city, a dreamy white Christmas becomes a delightful prospect. Winter activities, such as building snowmen and ice-skating, turn the city into a winter fun-zone. As the city bids farewell to the year, the wintry chill ensures a cozy end to the year in Dillon.Temperature
December, known for its average high temperature of 25.2°F (-3.8°C) and an average low temperature of 10.6°F (-11.9°C), is the coldest month.Humidity
In December, the average relative humidity in Dillon is 85%.Rainfall
In Dillon, in December, during 8.9 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. In Dillon, during the entire year, the rain falls for 126.7 days and collects up to 10.35" (263mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. In Dillon, in December, during 14 snowfall days, 4.45" (113mm) of snow is typically accumulated. In Dillon, during the entire year, snow falls for 81.2 days and aggregates up to 29.76" (756mm) of snow.Daylight
The month with the shortest days is December, with an average of 8h and 48min of daylight.On the first day of December in Dillon, sunrise is at 7:50 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 8:09 am and sunset at 4:58 pm MST.
Sunshine
The month with the least sunshine is December, with an average of 6.1h of sunshine.UV index
In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum daily UV index of 2 during December morphs into the following directions:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Dillon, MT
- Average high temperature in December: 25.2°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is December (25.2°F).
- Average low temperature in December: 10.6°F
The month with the highest average low temperature is July (47.5°F).
The coldest month (with the lowest average low temperature) is December (10.6°F).
Average pressure in December
Dillon, MT
- Average pressure in December: 30.23"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Dillon, MT
- Average wind speed in December: 6.5mph
The windiest month (with the highest average wind speed) is November (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Dillon, MT
- Average humidity in December: 85%
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are July and August (45%).
Average rainfall in December
Dillon, MT
- Average rainfall in December: 0.63"
The wettest month (with the highest rainfall) is June (1.5").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in December
Dillon, MT
- Average rainfall days in December: 8.9 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (7.7 days).
Average snowfall in December
Dillon, MT
- Average snowfall in December: 4.45"
The month with the highest snowfall is February (5.51").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Dillon, MT
- Average snowfall days in December: 14 days
The month with the highest number of snowfall days is February (14.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Dillon, 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 6min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 6min).
Average sunshine days in December
Dillon, MT
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is July (18.2 days).
The month with the least sunshine days is April (10.1 days).
Average UV index in December
Dillon, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
Dillon, MT
- Average cloud cover in December: 40
The month with the most cloud cover is February (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in December
Dillon, MT
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
