Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December's arrival coincides with a drop in the average high-temperature, decreasing from November's frosty 47.3°F (8.5°C) to an icy 35.4°F (1.9°C). Mack's temperature in December lowers to a consistent average of 19.9°F (-6.7°C) during the nights.Humidity
The average relative humidity in December is 71%.Rainfall
In December, the rain falls for 7.2 days. Throughout December, 0.79" (20mm) of precipitation is accumulated. 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 in Mack, Colorado. Snow falls for 6.7 days and accumulates 4.41" (112mm) of snow.Daylight
The month with the shortest days is December, 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
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: The daily high UV index of 2 in December translates into this advice:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Frequently asked questions
How cold is December in Mack?
What is the average humidity in December in Mack?
How much does it rain in Mack in December?
What is the snowiest month in Mack?
How much does it snow in Mack in December?
What is the month with the shortest days in Mack?
What is the average length of the day in December in Mack?
When is the sunrise / sunset in December in Mack?
How long on average sun shines in December in Mack?
What is the month with the lowest UV index in Mack?
What is the UV index intensity in December in Mack?
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 3min
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 4min
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).
Mack, Colorado, USA
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