West Allis, WI has a humid continental climate with cold winters and hot summers. The average annual temperature is 41°F (5°C). Temperatures can drop as low as -18°F (-28°C) in winter and climb up to 91°F (33°C) in summer. Precipitation is fairly consistent throughout the year with snowfall occurring mainly from December to March. Summer months tend to be humid and cloudy, while winters are cold and dry. This area also experiences occasional thunderstorms bringing heavy rain and strong winds in the spring and fall.
West Allis, Wisconsin gets 35 inches of rain, on average, per year. The US average is 38 inches of rain per year.
West Allis averages 45 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 188 sunny days per year in West Allis. The US average is 205 sunny days.
West Allis gets some kind of precipitation, on average, 123 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 84 degrees
Winter Low: the January low is 12
Rain: averages 35 inches of rain a year
Snow: averages 45 inches of snow a year