Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The arrival of December signals a shift in temperature, down from a frosty 43.7°F (6.5°C) in November to a freezing cold 31.5°F (-0.3°C). During December, the temperature is averaged to a low of 21.4°F (-5.9°C) at night.Humidity
In Williams Bay, the average relative humidity in December is 83%.Rainfall
January and December are months with the least rain in Williams Bay when the rain falls for 6.5 days and typically aggregates up to 0.79" (20mm) of rain.Snowfall
January through April, October through December are months with snowfall in Williams Bay. In Williams Bay, Wisconsin, during December, snow falls for 9.9 days and regularly aggregates up to 1.69" (43mm) of snow. Throughout the year, in Williams Bay, there are 47.5 snowfall days, and 11.81" (300mm) of snow is accumulated.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year in Williams Bay.On the first day of December in Williams Bay, sunrise is at 7:05 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:31 pm CST.
Sunshine
In December, the average sunshine is 3.8h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Williams Bay. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: During December, 1 as the daily maximum UV index converts into the following advice:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is it in Williams Bay in December?
What is the average humidity in December in Williams Bay?
What is the driest month in Williams Bay?
How many days does it rain in December in Williams Bay?
How many days does it snow in December in Williams Bay?
What is the month with the shortest days in Williams Bay?
How many hours of daylight does Williams Bay have in December?
What time are sunrise and sunset in December in Williams Bay?
How many hours of sunshine does Williams Bay have in December?
What is the month with the lowest UV index in Williams Bay?
What is the UV index intensity in December in Williams Bay?
Average temperature in December
Williams Bay, WI
- Average high temperature in December: 31.5°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 (24.8°F).
- Average low temperature in December: 21.4°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 (12.9°F).
Average pressure in December
Williams Bay, WI
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in December
Williams Bay, WI
- Average wind speed in December: 9.1mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in December
Williams Bay, 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
Williams Bay, WI
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is July (2.56").
The driest months (with the least rainfall) are January and December (0.79").
Average rainfall days in December
Williams Bay, WI
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is July (17.4 days).
The months with the least rainy days are January and February (3.8 days).
Average snowfall in December
Williams Bay, WI
- Average snowfall in December: 1.69"
The month with the highest snowfall is January (3.35").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Williams Bay, WI
- Average snowfall days in December: 9.9 days
The month with the highest number of snowfall days is January (13.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Williams Bay, WI
- Average daylight in December: 9h and 1min
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 5min
The months with the most sunshine are July and August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Williams Bay, WI
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in December
Williams Bay, 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
Williams Bay, WI
- Average cloud cover in December: 61
The month with the most cloud cover is January (Cloud cover 64).
The months with the least cloud cover are July, August and September (Cloud cover 35).
Average visibility in December
Williams Bay, WI
- Average visibility in December: 6mi
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Williams Bay, Wisconsin, USA
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