December weather forecastSun Prairie, WI
December
Weather in December
December lays out the white carpet of winter in Sun Prairie, Wisconsin. In contrast to November, winter now takes the lead, dropping the average temperature down to 30°F (-1.1°C). Snowfall becomes a regular occurrence, creating a stunning winter landscape. Weather conditions make it ideal for winter sports and holiday festivities. The month culminates in the end-of-year holiday season, making it one of the most visually appealing months.Temperature
A shift in the average high-temperature occurs in December in Sun Prairie, reducing from a cold 42.3°F (5.7°C) in November to a freezing cold 30°F (-1.1°C). Throughout December, Sun Prairie witnesses a nighttime temperature average of 19.9°F (-6.7°C).Humidity
In Sun Prairie, the average relative humidity in December is 84%.Rainfall
In Sun Prairie, during December, the rain falls for 6.2 days and regularly aggregates up to 1.3" (33mm) of precipitation. Throughout the year, there are 138.5 rainfall days, and 26.42" (671mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall in Sun Prairie. In Sun Prairie, in December, during 11.1 snowfall days, 2.8" (71mm) of snow is typically accumulated. Throughout the year, in Sun Prairie, there are 53 snowfall days, and 19.06" (484mm) of snow is accumulated.Daylight
The month with the shortest days in Sun Prairie is December, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 7:09 am and sunset at 4:22 pm. On the last day of December, in Sun Prairie, sunrise is at 7:28 am and sunset at 4:31 pm CST.
Sunshine
In Sun Prairie, the average sunshine in December is 3.9h.UV index
The months with the lowest UV index in Sun Prairie are January, November and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: A maximum daily UV index of 1 during December morphs into the following directions:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sun Prairie, WI
- Average high temperature in December: 30°F
The warmest month (with the highest average high temperature) is July (78.6°F).
The month with the lowest average high temperature is January (23.4°F).
- Average low temperature in December: 19.9°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 (10.9°F).
Average pressure in December
Sun Prairie, WI
- Average pressure in December: 30.09"Hg
The months with the highest atmospheric pressure are January and February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Sun Prairie, WI
- Average wind speed in December: 9.3mph
The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in December
Sun Prairie, WI
- Average humidity in December: 84%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Sun Prairie, WI
- Average rainfall in December: 1.3"
The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is February (1.1").
Average rainfall days in December
Sun Prairie, WI
- Average rainfall days in December: 6.2 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (4.7 days).
Average snowfall in December
Sun Prairie, WI
- Average snowfall in December: 2.8"
The month with the highest snowfall is January (5.04").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Sun Prairie, WI
- Average snowfall days in December: 11.1 days
The month with the highest number of snowfall days is January (14.2 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sun Prairie, WI
- Average daylight in December: 9h and 0min
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 0min).
- Average sunshine in December: 3h and 54min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in December
Sun Prairie, WI
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is December (16.8 days).
The month with the least sunshine days is June (10.8 days).
Average UV index in December
Sun Prairie, 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
Sun Prairie, WI
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 33).
Average visibility in December
Sun Prairie, 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).
