Alton, MO has a humid subtropical climate, characterized by hot and humid summers and cold winters. In summer, temperatures reach an average high of around 89°F and an average low of around 70°F. Winter temperatures drop to an average high of around 45°F and an average low of around 21°F. Average annual precipitation is over 47 inches, with most of it occurring during the warmer months in the form of thunderstorms. Snowfall is rare but possible, with an average annual snowfall of only 1 inch per year.
Alton, Missouri gets 46 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Alton averages 6 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 213 sunny days per year in Alton. The US average is 205 sunny days.
Alton gets some kind of precipitation, on average, 92 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 90 degrees
Winter Low: the January low is 22
Rain: averages 46 inches of rain a year
Snow: averages 6 inches of snow a year