December weather forecastMountain, WI
December
Weather in December
December, the first month of the winter in Mountain, is also a subzero cold month, with temperature in the range of an average high of 27.3°F (-2.6°C) and an average low of 18.5°F (-7.5°C).Temperature
As November transitions into December, Mountain sees a drop in the average high-temperature, transitioning from an icy 39.6°F (4.2°C) to a subzero cold 27.3°F (-2.6°C). Mountain records a slight downturn to an average 18.5°F (-7.5°C) during the nights of December.Humidity
In December, the average relative humidity is 85%.Rainfall
In Mountain, Wisconsin, in December, during 5.3 rainfall days, 1.38" (35mm) of precipitation is typically accumulated. In Mountain, during the entire year, the rain falls for 122.9 days and collects up to 21.34" (542mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. The month with the most snowfall is December, when snow falls for 11.8 days and typically aggregates up to 6.06" (154mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 48min of daylight.On the first day of the month, sunrise is at 7:13 am and sunset at 4:13 pm. On the last day of December, sunrise is at 7:32 am and sunset at 4:21 pm CST.
Sunshine
In Mountain, the average sunshine in December is 3.7h.UV index
In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. When the Sun is at its strongest around midday, find shade and limit exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mountain, WI
- Average high temperature in December: 27.3°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is January (21.6°F).
- Average low temperature in December: 18.5°F
The month with the highest average low temperature is July (58.1°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).
Average pressure in December
Mountain, WI
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Mountain, WI
- Average wind speed in December: 8mph
The windiest month (with the highest average wind speed) is April (8.4mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Mountain, WI
- Average humidity in December: 85%
The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (73%).
Average rainfall in December
Mountain, WI
- Average rainfall in December: 1.38"
The wettest month (with the highest rainfall) is June (2.6").
The driest months (with the least rainfall) are January and February (0.87").
Average rainfall days in December
Mountain, WI
- Average rainfall days in December: 5.3 days
The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is January (3.8 days).
Average snowfall in December
Mountain, WI
- Average snowfall in December: 6.06"
The month with the highest snowfall is December (6.06").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mountain, WI
- Average snowfall days in December: 11.8 days
The month with the highest number of snowfall days is January (14.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mountain, WI
- 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: 3h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 18min).
Average sunshine days in December
Mountain, WI
- Average sunshine days in December: 16.9 days
The months with the most sunshine days are September and December (16.9 days).
The month with the least sunshine days is April (12.8 days).
Average UV index in December
Mountain, WI
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, March and November (UV index 1).
Average cloud cover in December
Mountain, WI
- Average cloud cover in December: 61
The month with the most cloud cover is February (Cloud cover 66).
The month with the least cloud cover is July (Cloud cover 34).
Average visibility in December
Mountain, WI
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, October and November (6mi).
The months with the lowest visibility are January, February, March, July, August, September and December (5mi).
