December weather forecastMason, WI
December
Weather in December
December, the first month of the winter in Mason, is still a freezing cold month, with an average temperature varying between 16°F (-8.9°C) and 25.3°F (-3.7°C).Temperature
As November transitions to December, the average high-temperature falls from a cold 37.6°F (3.1°C) to a freezing cold 25.3°F (-3.7°C). During December, the average low-temperature is a still subzero cold 16°F (-8.9°C).Humidity
In Mason, the average relative humidity in December is 88%.Rainfall
In Mason, during December, the rain falls for 4.3 days and regularly aggregates up to 1.54" (39mm) of precipitation. Throughout the year, there are 121.6 rainfall days, and 21.42" (544mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. The month with the most snowfall is December, when snow falls for 20.2 days and typically aggregates up to 7.95" (202mm) of snow.Daylight
December has the shortest days of the year, with an average of 8h and 42min of daylight.On the first day of the month, sunrise is at 7:27 am and sunset at 4:19 pm. On the last day of December, sunrise is at 7:47 am and sunset at 4:27 pm CST.
Sunshine
In Mason, the average sunshine in December is 2.5h.UV index
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Mason. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the ordinary person.Note: The average daily UV index of 1 in December transforms into the following instructions:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mason, WI
- Average high temperature in December: 25.3°F
The warmest month (with the highest average high temperature) is July (76.8°F).
The month with the lowest average high temperature is January (19.4°F).
- Average low temperature in December: 16°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 (8.6°F).
Average pressure in December
Mason, WI
- Average pressure in December: 30.07"Hg
The month with the highest atmospheric pressure is February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Mason, WI
- Average wind speed in December: 8.9mph
The windiest month (with the highest average wind speed) is November (9.1mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).
Average humidity in December
Mason, WI
- Average humidity in December: 88%
The month with the highest relative humidity is January (91%).
The month with the lowest relative humidity is May (72%).
Average rainfall in December
Mason, WI
- Average rainfall in December: 1.54"
The wettest month (with the highest rainfall) is July (2.56").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in December
Mason, WI
- Average rainfall days in December: 4.3 days
The month with the highest number of rainy days is June (15.5 days).
The month with the least rainy days is January (3.2 days).
Average snowfall in December
Mason, WI
- Average snowfall in December: 7.95"
The month with the highest snowfall is December (7.95").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Mason, WI
- Average snowfall days in December: 20.2 days
The month with the highest number of snowfall days is January (21.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Mason, WI
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 2h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 18min).
Average sunshine days in December
Mason, WI
- Average sunshine days in December: 9.8 days
The month with the most sunshine days is September (15 days).
The month with the least sunshine days is December (9.8 days).
Average UV index in December
Mason, 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, November and December (UV index 1).
Average cloud cover in December
Mason, WI
- Average cloud cover in December: 75
The month with the most cloud cover is January (Cloud cover 78).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Mason, WI
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is January (4mi).
