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 brings a decrease in the average high-temperature, shifting from a wintry 36.7°F (2.6°C) in November to a freezing cold 23.4°F (-4.8°C). Throughout December, the nighttime temperature averages to an extreme cold 12.7°F (-10.7°C).Humidity
In Winter, the average relative humidity in December is 90%.Rainfall
In December, the rain falls for 3 days. Throughout December, 1.3" (33mm) of precipitation is accumulated. Throughout the year, in Winter, there are 109.7 rainfall days, and 20.04" (509mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. The month with the most snowfall is December, when snow falls for 14.9 days and typically aggregates up to 6.5" (165mm) of snow.Daylight
December has the shortest days of the year in Winter, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:25 am and sunset at 4:21 pm. On the last day of December, sunrise is at 7:45 am and sunset at 4:29 pm CST.
Sunshine
In Winter, the average sunshine in December is 2.5h.UV index
January, 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 minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 1 in December translates into this advice:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in December?
What is the average humidity in December?
How much does it rain in December?
What is the snowiest month?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
How long on average sun shines in December?
What are the months with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Winter, WI
- Average high temperature in December: 23.4°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (17.6°F).
- Average low temperature in December: 12.7°F
The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (5.2°F).
Average pressure in December
Winter, WI
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Winter, WI
- Average wind speed in December: 8mph
The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in December
Winter, WI
- Average humidity in December: 90%
The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is May (73%).
Average rainfall in December
Winter, WI
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is January (0.63").
Average rainfall days in December
Winter, WI
- Average rainfall days in December: 3 days
The month with the highest number of rainy days is June (15.5 days).
The month with the least rainy days is February (1.3 days).
Average snowfall in December
Winter, WI
- Average snowfall in December: 6.5"
The month with the highest snowfall is December (6.5").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Winter, WI
- Average snowfall days in December: 14.9 days
The month with the highest number of snowfall days is January (15.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Winter, WI
- Average daylight in December: 8h and 4min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 2h and 3min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in December
Winter, WI
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is October (17.7 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in December
Winter, WI
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in December
Winter, WI
- Average cloud cover in December: 75
The month with the most cloud cover is January (Cloud cover 79).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in December
Winter, WI
- Average visibility in December: 4mi
The months with the highest visibility are May, June and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Winter, Wisconsin, USA
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