December weather forecastMack, CO
December
Weather in December
The first month of the winter, December, is still a cold month in Mack, Colorado, with an average temperature fluctuating between 35.4°F (1.9°C) and 19.9°F (-6.7°C).Temperature
Mack's December weather features a mild decline in high-temperatures, reducing from a chilly 47.3°F (8.5°C) in November to a wintry 35.4°F (1.9°C). In December, Mack reports a consistent average low-temperature of 19.9°F (-6.7°C) during the nights.Humidity
In December, the average relative humidity is 71%.Rainfall
In Mack, during December, the rain falls for 7.2 days and regularly aggregates up to 0.79" (20mm) of precipitation. In Mack, during the entire year, the rain falls for 107.7 days and collects up to 9.33" (237mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in Mack. December is the month with the most snowfall. Snow falls for 6.7 days and accumulates 4.41" (112mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:16 am and sunset at 4:52 pm. On the last day of December, sunrise is at 7:34 am and sunset at 5:02 pm MST.
Sunshine
In Mack, the average sunshine in December is 6.7h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: A daily high UV index of 2 in December leads to these guidelines:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. To protect against the Sun's most potent rays, avoid direct exposure around midday. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mack, CO
- Average high temperature in December: 35.4°F
The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is January (33.8°F).
- Average low temperature in December: 19.9°F
The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is January (17.2°F).
Average pressure in December
Mack, CO
- Average pressure in December: 30.2"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The months with the lowest atmospheric pressure are May and June (29.89"Hg).
Average wind speed in December
Mack, CO
- Average wind speed in December: 4.6mph
The windiest month (with the highest average wind speed) is June (7.3mph).
The calmest month (with the lowest average wind speed) is January (4.2mph).
Average humidity in December
Mack, CO
- Average humidity in December: 71%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is June (30%).
Average rainfall in December
Mack, CO
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is October (1.02").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in December
Mack, CO
- Average rainfall days in December: 7.2 days
The month with the highest number of rainy days is July (12.8 days).
The month with the least rainy days is November (5.6 days).
Average snowfall in December
Mack, CO
- Average snowfall in December: 4.41"
The month with the highest snowfall is December (4.41").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Mack, CO
- Average snowfall days in December: 6.7 days
The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mack, CO
- Average daylight in December: 9h and 30min
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 30min).
- Average sunshine in December: 6h and 42min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 18min).
Average sunshine days in December
Mack, CO
- Average sunshine days in December: 20.2 days
The month with the most sunshine days is November (22.1 days).
The month with the least sunshine days is July (11.6 days).
Average UV index in December
Mack, CO
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Mack, CO
- Average cloud cover in December: 28
The month with the most cloud cover is January (Cloud cover 31).
The months with the least cloud cover are June and September (Cloud cover 11).
Average visibility in December
Mack, CO
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
