December weather forecastDelafield, WI
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Delafield, Wisconsin, with an average temperature ranging between max 30.9°F (-0.6°C) and min 21.2°F (-6°C).Temperature
Arrival of December comes with a reduction in the average high-temperature, falling from a frosty 43.3°F (6.3°C) in November to a freezing cold 30.9°F (-0.6°C). December nights in Delafield observe an average temperature dip to a still subzero cold 21.2°F (-6°C).Humidity
In December, the average relative humidity in Delafield is 83%.Rainfall
The month with the least rainfall is December, when the rain falls for 5.7 days and typically collects 0.75" (19mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Delafield, in December, snow falls for 10.5 days, with typically accumulated 1.69" (43mm) of snow. Throughout the year, in Delafield, there are 48.5 snowfall days, and 11.02" (280mm) of snow is accumulated.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year in Delafield.On the first day of the month, sunrise is at 7:06 am and sunset at 4:19 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:28 pm CST.
Sunshine
In December, the average sunshine is 3.7h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: In December, the maximum UV index of 1 suggests these recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Delafield, WI
- Average high temperature in December: 30.9°F
The warmest month (with the highest average high temperature) is July (78.3°F).
The month with the lowest average high temperature is January (24.6°F).
- Average low temperature in December: 21.2°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (13.1°F).
Average pressure in December
Delafield, WI
- Average pressure in December: 30.09"Hg
The months with the highest atmospheric pressure are January and February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Delafield, WI
- Average wind speed in December: 9.5mph
The windiest months (with the highest average wind speed) are January and February (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity in December
Delafield, WI
- Average humidity in December: 83%
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Delafield, WI
- Average rainfall in December: 0.75"
The wettest month (with the highest rainfall) is July (2.52").
The driest month (with the least rainfall) is December (0.75").
Average rainfall days in December
Delafield, WI
- Average rainfall days in December: 5.7 days
The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in December
Delafield, WI
- Average snowfall in December: 1.69"
The month with the highest snowfall is January (2.99").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Delafield, WI
- Average snowfall days in December: 10.5 days
The month with the highest number of snowfall days is January (12.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Delafield, 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 42min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 18min).
Average sunshine days in December
Delafield, WI
- Average sunshine days in December: 16.9 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is July (11.2 days).
Average UV index in December
Delafield, 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 and December (UV index 1).
Average cloud cover in December
Delafield, WI
- Average cloud cover in December: 62
The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in December
Delafield, 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).
