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
With the onset of December, Jefferson's average high-temperature adjusts, receding from November's chilly 43.7°F (6.5°C) to a subzero cold 31.1°F (-0.5°C). Throughout December, Jefferson witnesses a nighttime temperature average of 20.7°F (-6.3°C).Humidity
In December, the average relative humidity is 84%.Rainfall
In Jefferson, in December, during 6.9 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. In Jefferson, during the entire year, the rain falls for 149.4 days and collects up to 28.82" (732mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Jefferson, during December, snow falls for 12.6 days and regularly aggregates up to 3.94" (100mm) of snow. Throughout the year, there are 58 snowfall days, and 21.85" (555mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of December in Jefferson, sunrise is at 7:07 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:30 pm CST.
Sunshine
The average sunshine in December in Jefferson is 3.8h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Jefferson. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: In December, the maximum UV index of 1 suggests this advice:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. To avoid the Sun's strongest rays, limit exposure around the mid-day period. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Jefferson?
What is the average humidity in December in Jefferson?
How much does it rain in Jefferson in December?
How much does it snow in Jefferson in December?
What is the month with the shortest days in Jefferson?
How many hours of daylight does Jefferson have in December?
When are sunrise and sunset in December in Jefferson?
How many hours of sunshine does Jefferson have in December?
When is the lowest UV index in Jefferson?
How high is the UV index in December in Jefferson?
Average temperature in December
Jefferson, WI
- Average high temperature in December: 31.1°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 (24.3°F).
- Average low temperature in December: 20.7°F
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (12°F).
Average pressure in December
Jefferson, WI
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Jefferson, WI
- Average wind speed in December: 9.1mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in December
Jefferson, WI
- Average humidity in December: 84%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Jefferson, WI
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is June (3.78").
The driest months (with the least rainfall) are January and February (1.42").
Average rainfall days in December
Jefferson, WI
- Average rainfall days in December: 6.9 days
The month with the highest number of rainy days is May (19.6 days).
The month with the least rainy days is February (5 days).
Average snowfall in December
Jefferson, WI
- Average snowfall in December: 3.94"
The month with the highest snowfall is February (5.39").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Jefferson, WI
- Average snowfall days in December: 12.6 days
The month with the highest number of snowfall days is January (15.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Jefferson, WI
- Average daylight in December: 9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 3h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Jefferson, WI
- Average sunshine days in December: 14.3 days
The month with the most sunshine days is November (16.1 days).
The months with the least sunshine days are May and June (9.8 days).
Average UV index in December
Jefferson, WI
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in December
Jefferson, WI
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Jefferson, WI
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, October and November (6mi).
The months with the lowest visibility are January, February, July, August, September and December (5mi).
Jefferson, Wisconsin, USA
Weather forecast for your location
2. Allow the app to use your location