A year of home care built from local numbers: the snowiest weeks of January, the last frost around May 4, a mild July, a wet October and the first freeze not long before it.
New Hampshire's coast has four real seasons, and each one affects a house differently. Instead of a single spring cleaning, a Seacoast home does better with a few smaller efforts timed to the weather.
These figures come from NOAA normals at Greenland, next to Portsmouth, with some local notes from the towns. Treat the dates as typical ones rather than promises, since any given year can shift them by weeks.
The Greenland station averages 65.0 inches of snow a year, about 68 winter days with an inch or more on the ground and 143 nights at or below freezing. The last spring freeze usually lands around May 4 and the first fall freeze around October 8. January is the coldest month, with a high of 32.6 degrees and a low of 16.3.
July is the warmest, at 80.5 and 60.1 degrees. Precipitation totals about 50.65 inches a year across the seasons, with October the wettest at about 4.95 inches. Dry spells can still happen, as in September 2026, when Exeter kept Level 3 water restrictions because much of eastern New Hampshire remained in moderate drought.
Snow averages 14.2, 17.1, 15.8 and 13.9 inches across these four months. Put a stiff mat outside and a washable one inside each door you use, plus a tray for boots. Wipe up salt film with a damp cloth before it dries white, since it can dull wood and stone. Vacuum entry rugs often, so sand does not settle into the backing.
Windows stay shut and the heat runs, so dust moves around more. Change furnace filters on schedule, dust vents and wipe sills where condensation gathers on cold mornings. Older sash windows can leave water on the wood, so dry those sills to protect the paint and the wood beneath.
The ground thaws and mud replaces salt at the door. Portsmouth's curbside yard waste collection begins April 1, in paper bags or labeled barrels, so outdoor cleanup can get going too. Pay attention to the bottom edges of walls and doors, where the winter's grit collects.
Once the last frost passes around May 4, it is a good time for the big job: wash baseboards, clean window tracks, launder curtains and wipe blinds. A One-Time Deep Clean does much of this, and the deep cleaning guide explains what it includes. Also check for browntail moth activity, because UNH warns that caterpillar hairs can cause skin rashes.
With July highs around 80 degrees and lows near 60, the windows go up and homes finally air out. That makes it a good stretch to tackle closets, basements and anything that has held winter air. Rinse screens outside, and wipe sills once a week, because dust blows in along with the breeze.
If you live near the coast, sand becomes the new grit. Hampton Beach State Park lies along miles of sandy Atlantic beach, so rinse feet and shake towels outside. Hampton's summer trash schedule runs from the third Monday of June until just after the Seafood Festival in September, so check how that changes your pickup. Take care with linens on the line wherever browntail moths are active.
Early fall is a good time for a second, smaller reset before heat season. The first freeze usually falls around October 8. Vacuum heat registers before the furnace starts so last summer's dust does not blow through the house. Clean window tracks and check door sweeps.
October is the wettest month at about 4.95 inches, so expect wet leaves underfoot. Portsmouth's yard waste collection runs through November 30, so rake while you can. Put out the winter mats and boot trays before you need them. In drier years, check your town's water restrictions before you rinse porches or siding with a hose.
The questions Portsmouth homeowners ask most often about this topic, answered plainly.
TotalCare Cleaning will service Portsmouth and surrounding areas with background-checked cleaners and is insured up to $1 million. Re-clean guarantee: if we missed something, tell us by the end of the next day and we come back to fix it. Beyond Clean. TotalCare.
