OFallon, MO (63366) experiences a humid continental climate, with four distinct seasons throughout the year. During the summer months, temperatures average in the mid 80s Fahrenheit with high humidity levels and occasional thunderstorms. The winters are cold and dry, with temperatures often dropping below freezing at night and snowfall common during the season. Spring and Autumn both have mild temperatures and pleasant conditions for outdoor activities. Rain falls throughout the year, but is most consistent during April through July.
OFallon (zip 63366), Missouri gets 43 inches of rain, on average, per year. The US average is 38 inches of rain per year.
OFallon (zip 63366) averages 13 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 OFallon (zip 63366). The US average is 205 sunny days.
OFallon (zip 63366) gets some kind of precipitation, on average, 104 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 43 inches of rain a year
Snow: averages 13 inches of snow a year