St Louis Snowfall Totals & Accumulation Averages
This page pulls together information on when, how much and how often St Louis, Missouri has snow.
There are data and descriptions here of how many days it snows and the total amount of snowfall that St Louis usually gets. There are also monthly and yearly counts of the days that the city normally has heavy snowstorms and deep snow accumulated on the ground. Plus there's information on when St Louis can expect the first and last snowfalls of the season.
All the numbers are averages, based on weather data gathered from 1981 to 2010 at the Lambert–St Louis International Airport.
How Often it Snows in St Louis
This first table lists monthly and yearly totals for amount of snow and how many days it snows at least 0.1 inches (0.25 centimetres).
These averages don't show how much the snowfall in St Louis varies from year to year.
In December, for instance, one in four years totals over 7.7 inches of snow. Another 25 percent of years receive less than 0.8 inches for the month.
Similarly in January, fresh snowfall in the heaviest years amounts to seven inches or more, while the lightest years get two inches or less.
New snow for February ranges from over 6.8 inches in heavy snowfall years to no more than an inch in light years.
When St Louis Has Its First & Last Snowfalls
The first snowfall of winter for St Louis usually arrives in December. About once every four years, November also receives snow.
The season's last snowfall typically happens in March. In rare springs, April also gets some fresh snow.
St Louis is normally free of snow every year from May to October.
How Many Snowstorms St Louis Gets
Most days of snowfall in St Louis leave just a skiff, amounting to less than an inch, of fresh snow on the ground. For five days a year on average, the amount of new snow totals at least an inch.
Snowstorms of over five inches a day don't occur every year. Major blizzards that dump ten inches or more in one day are exceptional events, that happen about once a decade, usually in March.
How Much Snow Normally Accumulates in St Louis
For about one-fifth of winter days, St Louis has at least an inch of snow on the ground.
Typically, on one or two days in each of December, January and February, the snow covering St Louis accumulates to five or more inches deep.
Only in some years does the snowpack at St Louis top ten inches. The snow is most likely to get that deep in February.
National Climatic Data Center. NOAA's 1981-2010 Climate Normals.