December weather forecastByron, WI
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Byron, Wisconsin, with temperature in the range of an average low of 19.4°F (-7°C) and an average high of 29.1°F (-1.6°C).Temperature
The shift from November to December involves a decrease in the average high-temperature, dropping from a cold 42.1°F (5.6°C) to a freezing cold 29.1°F (-1.6°C). An average temperature of 19.4°F (-7°C) marks the nights in December.Humidity
In Byron, the average relative humidity in December is 86%.Rainfall
In Byron, during December, the rain falls for 3.7 days and regularly aggregates up to 0.35" (9mm) of precipitation. Throughout the year, there are 90.7 rainfall days, and 7.56" (192mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. In Byron, in December, snow falls for 9.3 days, with typically accumulated 0.67" (17mm) of snow. Throughout the year, there are 42 snowfall days, and 4.25" (108mm) of snow is accumulated.Daylight
With an average of 9h and 0min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:08 am and sunset at 4:18 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 4:27 pm CST.
Sunshine
In Byron, the average sunshine in December is 3.6h.UV index
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index, 1 during December, leads to the following recommendations:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Byron, WI
- Average high temperature in December: 29.1°F
The warmest month (with the highest average high temperature) is July (77.4°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in December: 19.4°F
The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).
Average pressure in December
Byron, WI
- Average pressure in December: 30.08"Hg
The months with the highest atmospheric pressure are January, February and March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Byron, WI
- Average wind speed in December: 9.9mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (7.1mph).
Average humidity in December
Byron, WI
- Average humidity in December: 86%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Byron, WI
- Average rainfall in December: 0.35"
The wettest months (with the highest rainfall) are June and October (0.94").
The driest months (with the least rainfall) are January and February (0.31").
Average rainfall days in December
Byron, WI
- Average rainfall days in December: 3.7 days
The months with the highest number of rainy days are April and July (11 days).
The month with the least rainy days is February (2.3 days).
Average snowfall in December
Byron, WI
- Average snowfall in December: 0.67"
The month with the highest snowfall is January (1.06").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Byron, WI
- Average snowfall days in December: 9.3 days
The month with the highest number of snowfall days is January (10.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Byron, WI
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 3h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in December
Byron, WI
- Average sunshine days in December: 21.5 days
The month with the most sunshine days is December (21.5 days).
The month with the least sunshine days is June (15.6 days).
Average UV index in December
Byron, WI
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Byron, WI
- Average cloud cover in December: 63
The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Byron, WI
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, October, November and December (6mi).
The months with the lowest visibility are January and September (5mi).
