December weather forecastHartland, WI
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Hartland, Wisconsin, with an average temperature ranging between min 21.7°F (-5.7°C) and max 31.3°F (-0.4°C).Temperature
Setting in of December comes with a decrease in the average high-temperature, moving from a chilly 43.3°F (6.3°C) in November to a subzero cold 31.3°F (-0.4°C). Throughout December, Hartland witnesses a consistent average low-temperature of 21.7°F (-5.7°C).Humidity
The average relative humidity in December is 83%.Rainfall
In Hartland, during December, the rain falls for 7.6 days and regularly aggregates up to 1.57" (40mm) of precipitation. Throughout the year, there are 149.2 rainfall days, and 28.54" (725mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In Hartland, during December, snow falls for 12.6 days and regularly aggregates up to 3.94" (100mm) of snow. In Hartland, during the entire year, snow falls for 58.7 days and aggregates up to 20.47" (520mm) of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:05 am and sunset at 4:19 pm. On the last day of December, in Hartland, sunrise is at 7:24 am and sunset at 4:28 pm CST.
Sunshine
In December, the average sunshine in Hartland is 3.8h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A maximum daily UV index of 1 during December morphs into the following directions:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. 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
Hartland, WI
- Average high temperature in December: 31.3°F
The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in December: 21.7°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (13.6°F).
Average pressure in December
Hartland, WI
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Hartland, WI
- Average wind speed in December: 9.9mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.7mph).
Average humidity in December
Hartland, WI
- Average humidity in December: 83%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (77%).
Average rainfall in December
Hartland, WI
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is June (3.43").
The driest month (with the least rainfall) is February (1.46").
Average rainfall days in December
Hartland, WI
- Average rainfall days in December: 7.6 days
The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in December
Hartland, WI
- Average snowfall in December: 3.94"
The month with the highest snowfall is January (5.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Hartland, 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
Hartland, WI
- Average daylight in December: 9h and 6min
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 48min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Hartland, WI
- Average sunshine days in December: 13.6 days
The month with the most sunshine days is November (15.9 days).
The months with the least sunshine days are June and July (10.3 days).
Average UV index in December
Hartland, 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
Hartland, WI
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 30).
Average visibility in December
Hartland, WI
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
