What to clean and when in a Charleston home, from a March 7 median last freeze to five sticky months, a wet August and the fall tides that top the flood records.
Charleston's cleaning year does not follow the northern script. Spring arrives while much of the country is still cold, summer goes on for months, and the highest flood counts land in the fall. A list built for Boston or Chicago will have you doing the right things at the wrong times.
The numbers here come from NOAA normals at Charleston International Airport and National Weather Service flood records. Use this as a list to do yourself or to time a professional visit.
This is the easy part of the year, and it is a good time for the jobs that need open windows and dry air. Dew points average about 39 degrees in January, so bathrooms clear quickly and painted trim dries fast. Clean closets, wash curtains, turn mattresses and go through the storage spots that felt too close in August.
Charleston averages about 22 nights at or below freezing and 0.3 inches of snow. It does freeze now and then, and Charleston Water System advises letting an indoor faucet drip overnight in freezing weather, which it calls ideal for older homes with a crawl space and uninsulated pipes. Check under sinks in the morning after a hard freeze.
The median last spring freeze comes around March 7, so plants are moving early. The Asthma and Allergy Foundation of America ranks Charleston 35th of 100 metro areas in its 2026 Allergy Capitals report, with a score above the average. This is when sills, porch furniture and window tracks pick up a fine film, so wash the blinds, launder the curtains and change the air filter.
It is also the last comfortable window for heavier work before the humidity arrives. If you want a One-Time Deep Clean before the sticky months, this is the moment. Clear out gutters and flower pots, too, since Clemson Extension says the Asian tiger mosquito breeds in containers like those.
The normal dew point reaches 62 degrees in May and stays at or above that through September, peaking at about 73 in July and August. Run bathroom fans during and after showers, squeegee the glass and keep the air conditioning on when you are away, so damp air does not sit in closed rooms.
June through September each bring more than 6 inches of rain, with August the wettest at 6.97 inches. About 64 days a year reach 90 degrees. Keep a boot tray and spare towels by the door, wipe up wet floors promptly, and vacuum vents and change filters as the system works through the hot months. Tip standing water in the yard after each rainy stretch.
The National Weather Service record for the Charleston Harbor gauge shows the most coastal flood events in October, with 272, followed by September with 259 and November with 180. If you park on a tide-prone street, expect wet tires and salty shoes on some of the nicest days of the year. Mats earn their keep now.
Fall is also when Clemson Extension says kudzu bugs move into cracks and voids around homes, especially light colored ones. Vacuum them up rather than crushing them, because they can stain fabrics and wall coverings. As the air dries out, it is a good time to deal with the whole summer's film on fans, vents and shower glass. The median first freeze comes around November 27, so outdoor jobs remain easy until late in the month. Clean the porch furniture before you store it, rinse the doormats and check that the storm supplies you used in August have been restocked. If you have kept to this list, the house should reach the holidays in good shape, without one enormous job.
The questions Charleston homeowners ask most often about this topic, answered plainly.
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