December weather forecastLannon, WI
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Lannon, Wisconsin, with an average temperature ranging between min 22.8°F (-5.1°C) and max 31.5°F (-0.3°C).Temperature
Onset of December comes with a temperature decline, the average high falling from a chilly 43.3°F (6.3°C) in November to a freezing cold 31.5°F (-0.3°C). December's average low temperature in Lannon is a still subzero cold 22.8°F (-5.1°C), displaying a subtle drop from its daily peak.Humidity
In December, the average relative humidity is 83%.Rainfall
In Lannon, during December, the rain falls for 6.4 days and regularly aggregates up to 1.22" (31mm) of precipitation. In Lannon, during the entire year, the rain falls for 139.2 days and collects up to 25.28" (642mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in Lannon. In Lannon, Wisconsin, in December, snow falls for 10.9 days, with typically accumulated 3.23" (82mm) of snow. In Lannon, during the entire year, snow falls for 48.9 days and aggregates up to 15.35" (390mm) of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year in Lannon, Wisconsin.On the first day of the month, sunrise is at 7:05 am and sunset at 4:18 pm. On the last day of December, in Lannon, sunrise is at 7:24 am and sunset at 4:27 pm CST.
Sunshine
In Lannon, the average sunshine in December is 4h.UV index
January, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Lannon. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.Note: In December, the average maximum UV index of 1 translates into the following recommendations:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Lannon, WI
- Average high temperature in December: 31.5°F
The warmest month (with the highest average high temperature) is July (77.5°F).
The month with the lowest average high temperature is January (25.2°F).
- Average low temperature in December: 22.8°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (14.4°F).
Average pressure in December
Lannon, 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
Lannon, WI
- Average wind speed in December: 10.4mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in December
Lannon, WI
- Average humidity in December: 83%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (76%).
Average rainfall in December
Lannon, WI
- Average rainfall in December: 1.22"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is February (1.02").
Average rainfall days in December
Lannon, WI
- Average rainfall days in December: 6.4 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in December
Lannon, WI
- Average snowfall in December: 3.23"
The month with the highest snowfall is January (4.02").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Lannon, WI
- Average snowfall days in December: 10.9 days
The month with the highest number of snowfall days is January (12.6 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
Lannon, 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: 4h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in December
Lannon, WI
- Average sunshine days in December: 15.9 days
The month with the most sunshine days is December (15.9 days).
The month with the least sunshine days is April (12 days).
Average UV index in December
Lannon, WI
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in December
Lannon, WI
- Average cloud cover in December: 60
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 28).
Average visibility in December
Lannon, WI
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
