Month by month cleaning for Washington DC, built from the Reagan National climate normals, the Tidal Basin bloom window, the Aqueduct's spring chlorine switch and the fall pest season.
Washington has four real seasons, and each one leaves a different mark inside the house. The 1991 to 2020 normals at Reagan National Airport put annual precipitation at 41.82 inches spread over about 72 days of measurable rain or snow, with July the wettest month. Snow is modest most years but heavy every few.
Use this calendar as a checklist for your own chores or as notes for a cleaner on a recurring plan. Each block lists what builds up that time of year and where to focus.
Reagan National's normal snowfall is 13.7 inches a year, nearly all of it in January (4.9 inches) and February (5.0 inches), and the airport averages about 60 nights below freezing. D.C. Code 9-601 requires owners of homes that front a paved sidewalk to clear snow and sleet within the first 8 hours of daylight after it stops, so ice melt and salt end up on every front step.
Inside, that means white residue on hardwood and grit on stair treads. Keep a stiff mat outside and an absorbent one inside, wipe salt off floors with a damp microfiber rather than letting it sit, and dust radiator tops in older homes, since dust there gets baked into a smell once the heat cycles on. Blizzards hit Washington about once every four to six years on average, so keep extra mats ready.
The National Park Service says Tidal Basin cherry trees most often reach peak bloom between the last week of March and the first week of April, which is a good marker for when tree pollen is in full force. University of Maryland Extension notes the Mid-Atlantic spring is long, so pollen and allergy symptoms can last a while and pollen visibly coats windshields.
This is also when the Washington Aqueduct switches its disinfectant from chloramine to chlorine for several weeks; in 2026 it ran March 23 through May 4, and DC Water notes the water can taste and smell more of chlorine. Focus on window sills, screens, tracks and the entry floor, wash bedding more often, and shower before bed if pollen bothers you.
Once the worst of the pollen settles, late spring is the best window for a One-Time Deep Clean. Wipe the pollen layer off blinds and ceiling fans, wash the inside of windows, clean out window tracks and degrease the kitchen before summer humidity makes grime sticky. June's normal precipitation of 4.20 inches is close behind July's, so wipe down entries and check the mudroom drain mat.
Clean faucet aerators as part of the reset. DC Water suggests removing and cleaning them every three months, and late spring is a natural time to do one of those four.
July's normal high at Reagan National is 89.6 degrees, the airport averages 40 days a year at 90 or hotter, and July is the wettest month at 4.33 inches. Average relative humidity runs around 66 percent, and summer heat brings frequent thunderstorms. Bathrooms dry slowly, towels stay damp and grout darkens.
Run bathroom fans for a while after showers, wipe shower walls down weekly, wash bath mats often and keep closets slightly open for airflow. After storms, wipe up tracked mud right away so it does not dry into grout lines on tile entries.
Hurricanes or their remnants occasionally reach the Washington area in late summer and early fall. Clear gutters and window wells and check basement corners after heavy rain. Any real water intrusion is a job for a restoration company, not a cleaner.
Fall is also when brown marmorated stink bugs look for shelter in homes and Asian lady beetles gather around windows on sunny days, according to University of Maryland Extension. Vacuum them up from sills and frames rather than crushing them, and empty the vacuum outside.
Leaf season fills entries with debris. In Alexandria, for example, city crews run leaf vacuum trucks and collect paper leaf bags by zone from late October through January. Keep a boot tray by the door and vacuum entry rugs more often.
Before guests arrive for the holidays, focus on the kitchen, the guest bath and the entry, and dust the radiators again before the heating season settles in.
The questions Washington DC homeowners ask most often about this topic, answered plainly.
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