Month by month, what a Main Line home needs: salt and slush in winter, the lanternfly hatch in spring, humid July and August, stink bugs in fall and the township leaf collections.
Cleaning calendars written for the whole country miss what actually happens to a house between Ardmore and Malvern. Here the year is set by a humid subtropical climate at its northern edge, two invasive insects that arrive on a schedule, and township leaf pickups that run on their own dates.
Use this calendar to plan the extra jobs each season and to decide when a deep clean, or a change in visit frequency, makes the most sense.
The nearest long running weather station is Philadelphia International Airport. Its 1991 to 2020 normals show about 44.11 inches of precipitation a year and 23.1 inches of snow. Normal dew points reach 64.6 degrees in July and 63.7 in August, which is muggy enough to slow how fast bathrooms and basements dry.
Two insects add their own calendar. Penn State Extension says spotted lanternfly eggs hatch from late April to June, adults appear in July, and they stay active until hard freezes. Brown marmorated stink bugs gather on houses in September and October. Plan around those dates and the year gets a lot easier.
These are the deep winter weeks, and every trip to the car or the train brings salt back in. White salt film on hardwood and stone floors is the main winter mess. Put a coarse mat outside each door and an absorbent one inside, and keep boots on a tray.
Steam radiators in older houses collect a surprising amount of dust while the heat runs. A soft brush and a vacuum crevice tool clear the fins. Inside, close-fitting storm windows keep cold out but also trap condensation on the sills, so wipe those dry.
Once the last snow has melted, the house is ready for a full reset. This is the most common time for a One-Time Deep Clean on the Main Line: baseboards washed, blinds wet-wiped, window tracks cleared of whatever the winter left, and ceiling fans and vents wiped before they start running again.
Chanticleer, the 35 acre public garden in Wayne, welcomes visitors from April, and gardens across the Main Line wake up at the same time. Outdoor furniture comes out of storage now, which is a good moment to wash it before lanternfly season.
Spotted lanternfly nymphs hatch from late April through June. They are small and mostly outdoors, but this is the time to check trees near the house and plan for the adults that follow.
Late May into early June is also Devon Horse Show season, held every year since 1896 and running for ten days. Households in Devon, Berwyn and Paoli that host family or friends for the show may want a clean the week before. Grass clippings and garden soil make this a busy time for window sills and entry floors.
These are the muggiest months, with dew points in the mid 60s. Bathrooms with old, small exhaust fans stay damp, so run the fan longer and leave the shower door ajar. Grout and caulk will show it first.
Adult lanternflies appear in July. Their sugary honeydew grows black sooty mold on decks, patios, railings and cars. Hose decks and furniture often, and expect sticky residue on shoes and paws at the back door. Bi-weekly visits keep up with it better than monthly ones.
Brown marmorated stink bugs gather on siding in September and October looking for a place to spend the winter, and many end up in window tracks, sills and attics. Vacuum them instead of crushing them, then empty the vacuum outside. Sealing gaps around older wood windows helps more than anything else.
Lanternflies are still active until hard freezes, so entry floors and door glass still need attention. A deep clean in mid to late October catches both before the holidays.
Leaf collection runs on township schedules. Newtown Township picks up raked leaves at the curb by zone, once before Thanksgiving and once after, and takes leaves only. Haverford Township collects leaves at the curb in fall, and Tredyffrin residents can use the Mill Road Leaf Site for drop-offs into December. Leaf bits and grit travel indoors on every shoe, so time cleaning visits after yard work rather than before.
Before holiday guests, focus on the guest bath, the kitchen and the front entry. Once the heat is on, start the radiator dusting again.
The questions Philadelphia Main Line homeowners ask most often about this topic, answered plainly.
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