December weather forecastDillon, CO
December
Weather in December
As the year concludes, December presents Dillon under a pristine snow blanket accumulating up to 9.49" (241mm). The festive spirit is in the air, and snow-covered landscapes create an enchanting aura. The winding down of the year is marked by cooler temperatures, plenty of snowfall, and a remarkable number of daylight hours. With the city beautifully lit up, it’s an ideal time for holiday-themed photographs. Despite the cold, Dillon concludes the calendar with a heartwarming ambiance.Temperature
December, characterized by an average high temperature of 22.5°F (-5.3°C) and a low temperature of 0.9°F (-17.3°C), is generally the coldest month.Humidity
In Dillon, the average relative humidity in December is 85%.Rainfall
In Dillon, in December, it is raining for 4.3 days, with typically 1.18" (30mm) of accumulated precipitation. In Dillon, during the entire year, the rain falls for 111.5 days and collects up to 23.19" (589mm) of precipitation.Snowfall
Months with snowfall are January through December. In Dillon, in December, during 16.7 snowfall days, 9.49" (241mm) of snow is typically accumulated. Throughout the year, there are 149 snowfall days, and 108.54" (2757mm) of snow is accumulated.Daylight
With an average of 9h and 24min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:06 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:50 pm MST.
Sunshine
The average sunshine in December is 5.6h.UV index
February, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for average individuals.Note: A maximum UV index of 1 in December translates into the following recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Dillon, CO
- Average high temperature in December: 22.5°F
The warmest month (with the highest average high temperature) is July (67.1°F).
The month with the lowest average high temperature is December (22.5°F).
- Average low temperature in December: 0.9°F
The month with the highest average low temperature is July (39.7°F).
The coldest month (with the lowest average low temperature) is December (0.9°F).
Average pressure in December
Dillon, CO
- Average pressure in December: 30.16"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is April (29.93"Hg).
Average wind speed in December
Dillon, CO
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is February (7mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in December
Dillon, CO
- Average humidity in December: 85%
The month with the highest relative humidity is February (88%).
The month with the lowest relative humidity is June (53%).
Average rainfall in December
Dillon, CO
- Average rainfall in December: 1.18"
The wettest month (with the highest rainfall) is July (3.39").
The driest month (with the least rainfall) is January (1.06").
Average rainfall days in December
Dillon, CO
- Average rainfall days in December: 4.3 days
The month with the highest number of rainy days is July (22.7 days).
The month with the least rainy days is November (2.8 days).
Average snowfall in December
Dillon, CO
- Average snowfall in December: 9.49"
The month with the highest snowfall is April (18.27").
The month with the least snowfall is July (0.47").
Average snowfall days in December
Dillon, CO
- Average snowfall days in December: 16.7 days
The month with the highest number of snowfall days is April (21 days).
The month with the least snowfall days is July (1.8 days).
Average daylight in December /
Average sunshine in December
Dillon, CO
- Average daylight in December: 9h and 24min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 5h and 36min
The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is February (Average sunshine: 5h and 24min).
Average sunshine days in December
Dillon, CO
- Average sunshine days in December: 14.5 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is July (5.3 days).
Average UV index in December
Dillon, CO
- Average UV index in December: 1
The months with the highest UV index are July and August (UV index 4).
The months with the lowest UV index are February, November and December (UV index 1).
Average cloud cover in December
Dillon, CO
- Average cloud cover in December: 47
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 19).
Average visibility in December
Dillon, CO
- Average visibility in December: 4mi
The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
