December weather forecastSparta, WI
December
Weather in December
December, the first month of the winter in Sparta, is still a freezing cold month, with an average temperature fluctuating between 27.5°F (-2.5°C) and 16.7°F (-8.5°C).Temperature
As November transitions into December, Sparta sees a drop in the average high-temperature, transitioning from an icy 41.2°F (5.1°C) to a freezing cold 27.5°F (-2.5°C). Throughout the month of December, Sparta witnesses an average temperature of 16.7°F (-8.5°C).Humidity
In Sparta, the average relative humidity in December is 87%.Rainfall
In Sparta, during December, the rain falls for 6.3 days and regularly aggregates up to 1.73" (44mm) of precipitation. Throughout the year, there are 142.9 rainfall days, and 29.13" (740mm) of precipitation is accumulated.Snowfall
Months with snowfall in Sparta are January through May, October through December. In Sparta, Wisconsin, during December, snow falls for 14.1 days and regularly aggregates up to 5.39" (137mm) of snow. Throughout the year, there are 67.6 snowfall days, and 26.34" (669mm) of snow is accumulated.Daylight
With an average of 9h and 0min of daylight, December has the shortest days of the year in Sparta, Wisconsin.On the first day of December, sunrise is at 7:18 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 4:35 pm CST.
Sunshine
The average sunshine in December in Sparta, Wisconsin, is 3.3h.UV index
The months with the lowest UV index in Sparta are January, February, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 1 during December leads to these advisories:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sparta, WI
- Average high temperature in December: 27.5°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 (21.6°F).
- Average low temperature in December: 16.7°F
The month with the highest average low temperature is July (60.8°F).
The coldest month (with the lowest average low temperature) is January (8.1°F).
Average pressure in December
Sparta, WI
- Average pressure in December: 30.1"Hg
The months with the highest atmospheric pressure are January and February (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Sparta, WI
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in December
Sparta, WI
- Average humidity in December: 87%
The months with the highest relative humidity are January and February (90%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in December
Sparta, WI
- Average rainfall in December: 1.73"
The wettest month (with the highest rainfall) is June (4.57").
The driest month (with the least rainfall) is January (1.1").
Average rainfall days in December
Sparta, WI
- Average rainfall days in December: 6.3 days
The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in December
Sparta, WI
- Average snowfall in December: 5.39"
The month with the highest snowfall is February (6.85").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Sparta, WI
- Average snowfall days in December: 14.1 days
The month with the highest number of snowfall days is January (15.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sparta, 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 18min
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 0min).
Average sunshine days in December
Sparta, WI
- Average sunshine days in December: 14.4 days
The month with the most sunshine days is October (15.6 days).
The month with the least sunshine days is June (8.4 days).
Average UV index in December
Sparta, 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, February, November and December (UV index 1).
Average cloud cover in December
Sparta, WI
- Average cloud cover in December: 65
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in December
Sparta, WI
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
