December weather forecastWest Allis, WI
December
Weather in December
December in West Allis is a winter wonderland with the landscape blanketed in a nearly 2" (51mm) layer of snow. As winter fully settles in, the frosty weather creates crystal-clear skies and crisp, clean air. Beautiful scenes of icicles adorning trees and buildings become common, offering gorgeous opportunities for winter photography. The city gears up for the festive holiday season, evident in the colorful decorations and seasonal events taking place despite the cold ambiance. As we wrap up the year, remember to dress warmly for the chilliest month in the city.Temperature
The transition into December indicates a reduction in the average high-temperature, down to a cold 32.4°F (0.2°C) from November's chilly 43.7°F (6.5°C). Night temperatures during December experience a slight downturn, averaging a freezing cold 23.7°F (-4.6°C).Humidity
In December, the average relative humidity is 81%.Rainfall
The months with the least rainfall are February and December Rain falls for 5.9 days and accumulates 0.83" (21mm) of rain.Snowfall
January through April, October through December are months with snowfall. In West Allis, in December, during 8.8 snowfall days, 1.77" (45mm) of snow is typically accumulated. In West Allis, Wisconsin, during the entire year, snow falls for 43.6 days and aggregates up to 11.22" (285mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:04 am and sunset at 4:18 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:27 pm CST.
Sunshine
In West Allis, the average sunshine in December is 3.9h.UV index
January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index of 1 during December leads to these instructions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. 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. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
West Allis, WI
- Average high temperature in December: 32.4°F
The warmest month (with the highest average high temperature) is July (77.9°F).
The month with the lowest average high temperature is January (26.1°F).
- Average low temperature in December: 23.7°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in December
West Allis, 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 (29.92"Hg).
Average wind speed in December
West Allis, WI
- Average wind speed in December: 10.7mph
The windiest month (with the highest average wind speed) is January (11.4mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).
Average humidity in December
West Allis, WI
- Average humidity in December: 81%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (75%).
Average rainfall in December
West Allis, WI
- Average rainfall in December: 0.83"
The wettest month (with the highest rainfall) is July (2.56").
The driest months (with the least rainfall) are February and December (0.83").
Average rainfall days in December
West Allis, WI
- Average rainfall days in December: 5.9 days
The month with the highest number of rainy days is July (15.9 days).
The month with the least rainy days is February (3.3 days).
Average snowfall in December
West Allis, WI
- Average snowfall in December: 1.77"
The month with the highest snowfall is January (3.03").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
West Allis, WI
- Average snowfall days in December: 8.8 days
The month with the highest number of snowfall days is January (11.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
West Allis, 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 54min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
West Allis, WI
- Average sunshine days in December: 17.2 days
The month with the most sunshine days is November (17.4 days).
The months with the least sunshine days are July and August (12.7 days).
Average UV index in December
West Allis, 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 and December (UV index 1).
Average cloud cover in December
West Allis, 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 and August (Cloud cover 29).
Average visibility in December
West Allis, WI
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
