Month by month cleaning for St. Louis, built from Lambert airport climate normals and the National Weather Service freeze dates, with notes on the storms that have hit the region.
St. Louis does not have a mild season that lasts long. The National Weather Service puts the median last spring freeze at Lambert airport on April 2 and the median first fall freeze on November 1, which leaves about seven frost-free months between two stretches of real cold. Inside those months come the rainiest weeks of the year and a hot, humid summer.
This calendar groups the year the way the local weather does and lists what to clean when. It is a planning tool for your own chores and for scheduling professional visits around them.
January is the coldest and snowiest month at Lambert, with a normal low of about 24 degrees and about 5.7 inches of the season's 16.6 inches of snow. The airport averages about 17 days a year with an inch or more on the ground. Big storms happen: the January 4 to 6, 2025 storm left about 6 to 9 inches across much of the metro, and snow stayed on the ground for more than two weeks.
With windows shut and the furnace on, this is the season for indoor air and floors.
The median last freeze falls on April 2, and April is the second rainiest month of the year at about 4.7 inches. Thawing yards and wet weeks send mud through every back door. Spring storms are part of the picture too: on May 16, 2025, an EF3 tornado crossed from Clayton through Forest Park and north St. Louis, and the National Weather Service reports that thousands of buildings in the city were damaged.
May is the wettest month at Lambert, at about 4.82 inches. Basements and lower levels stay damp, and entry floors see mud even after the yard dries. This is a good time to clean the basement laundry area, wipe down the washer and dryer exteriors and wash the floor around the floor drain.
Bathrooms start to dry more slowly as the weather warms. Make a habit of running the exhaust fan for a while after every shower before the summer humidity arrives in full.
July is the hottest month, with a normal high near 90 degrees, and the airport averages about 47 days a year at 90 or above. Dew points sit near 67 in July and 66 in August. Air conditioning keeps rooms cool but the moisture still finds glass, tile and kitchen surfaces.
Heavy summer rain can come all at once. On July 26, 2022, Lambert recorded 8.64 inches of rain in a single day, an all-time daily record, and flash flooding submerged cars in University City near Olive Boulevard. Cleaning is not flood recovery; if water gets into a home, that is work for a restoration company first.
The weeks before the median first freeze on November 1 are the last comfortable stretch to clean with windows up. Use them for the jobs that need airflow: wiping kitchen cabinet fronts, washing windows inside and out where you can reach safely, and vacuuming upholstery.
Leaves are the big outdoor mess. In the city, yard waste pickup continues weekly through December, and University City collects leaves raked to the curb on a fall schedule. Leaves that get tracked in grind into rugs, so this is a good season for a deep clean before the house closes up for winter.
The questions St. Louis homeowners ask most often about this topic, answered plainly.
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