Ballwin, MO has a humid continental climate characterized by hot and humid summers, cold and icy winters, and abundant precipitation throughout the year. During summer months, temperatures typically reach the mid to upper 80s with high humidity levels. Winters are cold with temperatures falling below freezing on average from December to February. Snowfall is common during winter months but can occur as early as October and as late as April. Precipitation is also abundant throughout the year, with an average of 40 inches per year distributed fairly evenly between all four seasons.
Ballwin, Missouri gets 44 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Ballwin averages 12 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 202 sunny days per year in Ballwin. The US average is 205 sunny days.
Ballwin gets some kind of precipitation, on average, 101 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 88 degrees
Winter Low: the January low is 21
Rain: averages 44 inches of rain a year
Snow: averages 12 inches of snow a year