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
December shows a mild decline in the average high-temperature, falling from November's frosty 43.7°F (6.5°C) to a cold 32.4°F (0.2°C). A modest decline from daytime high temperatures is noticed in December, marking the average low at a freezing cold 23.7°F (-4.6°C).Humidity
In December, the average relative humidity in West Allis is 81%.Rainfall
February and December are months with the least rain in West Allis when the rain falls for 5.9 days and typically aggregates up to 0.83" (21mm) of rain.Snowfall
January through April, October through December are months with snowfall. In December, in West Allis, it is snowing for 8.8 days. Throughout December, 1.77" (45mm) of snow is 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
With an average of 9h and 6min of daylight, December has the shortest days of the year in West Allis, Wisconsin.On the first day of the month, sunrise is at 7:04 am and sunset at 4:18 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:27 pm CST.
Sunshine
The average sunshine in December in West Allis, Wisconsin, is 3.9h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The daily maximum UV index of 1 in December interprets into the following advice:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Frequently asked questions
How cold is it in West Allis in December?
What is the average humidity in December in West Allis?
What is the driest month in West Allis?
How many days does it rain in December in West Allis?
How much does it snow in West Allis in December?
What is the month with the shortest days in West Allis?
How many hours of daylight does West Allis have in December?
When is the sunrise / sunset in December in West Allis?
How long on average sun shines in December in West Allis?
What are the months with the lowest UV index in West Allis?
What is the UV index intensity in December in West Allis?
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 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: 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).
West Allis, Wisconsin, USA
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