Westchester County, New York · White Plains
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Pipes freeze in Westchester County on about 28 nights a year, mostly December to March. Older homes, 52% of the stock here, are most at risk.
Heavy rain days of an inch or more come about 8.4 times a year here, most often in October. A sump pump that hasn't run since last season is a common weak point.
Backups often follow heavy rain, which Westchester County gets about 8.4 days a year, when storm water overloads sewer mains and pushes up through the lowest drain in the house.
Roof leaks here come from summer downpours and, with about 85 freeze-thaw days a year, from winter ice dams. Most show up as ceiling stains in the room below.
3% of occupied homes in Westchester County heat mainly with wood or propane, below the New York county median of 19%.
Muggy summer nights, lows of 65°F or more, come about 48 times a year in Westchester County. Mold after a leak spreads fastest from June through August.
Local risk profile
With 394,358 homes and around 999,677 residents, Westchester County is 431 square miles of southeast New York. The county seat is White Plains, and Yonkers, New Rochelle and Mount Vernon round out the largest towns. It has some of the oldest housing in the state: the median home went up in 1959.
59/100 Water Damage Risk Index: Elevated Westchester County ranks 10 of 57 New York counties. See the statewide ranking and method.The three factors where Westchester County ranks highest compared with other New York counties.
Westchester County is milder than most of New York, but not mild enough to skip winterizing. In the 2015–2024 record the county logged about 28 nights a year at or below 20°F (55th of 57) and 100 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
On February 24, 2015 the low fell to about -5°F, and in the stretch ending January 2018 the county went 14 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
The freeze season here runs December to March, with January the coldest. If you travel then, leave the thermostat at 55°F or above and open sink cabinets on outside walls.
On average the first fall freeze arrives around Nov 5 and the last spring freeze around Apr 7.
Heavy rain is a bigger factor here than in most of New York. The county gets about 46.1 inches of rain and melted snow a year, with 8.4 days of an inch or more (8th of 57). Those downpours cluster in July, September and October, when sump pumps and gutters are tested hardest. The wettest day on record brought 5.32 inches on September 2, 2021. Multi-day storms matter most for basements; the wettest three days on record here totaled 5.46 inches (through September 2, 2021).
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 85 times a year here. They're the main driver of ice dams and of water working its way through foundation cracks in late winter.
Housing
New York's 57 counties range widely in housing age; Westchester ranks 8th, with 76% of its homes built before 1980.
In Westchester County 52% of homes are older than 1960. If yours is one of them and the plumbing has never been replaced, expect galvanized steel supply pipe and cast iron drain lines, the two materials most likely to fail quietly.
Renters occupy 38% of homes. If you rent, the building is usually the landlord's to repair, but your belongings are only covered by renters insurance.
Beyond water
About 48 nights a year in Westchester County stay at 65°F or warmer, a sign of muggy summer air (3rd of 57 counties). July is the wettest month. The EPA recommends keeping indoor humidity below 60%, ideally 30 to 50%. Basements can pass 60% on their own in summer, so a dehumidifier matters even without a leak, and anything wet should be dried within 24 to 48 hours.
Mold remediation: what to expectHeating fuel matters for fire risk. In Westchester County it's 52% utility gas, 14% electric, 3% propane and under 1% wood. Fires here are likelier to start in the kitchen or the wiring than in the furnace. After any fire, keep the HVAC off until ducts are checked, or soot will travel through the house.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Westchester County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Putnam and Rockland get more pipe-freeze nights than Westchester. Nassau County has the oldest housing nearby, with 85% of homes built before 1980.
By the numbers
| Factor | Westchester | New York median | Rank |
|---|---|---|---|
| Homes built before 1960 | 52% | 45% | 16 of 57 |
| Homes built before 1980 | 76% | 67% | 8 of 57 |
| Homes built 2000 or later | 11% | 13% | 43 of 57 |
| Manufactured or mobile homes | 0.2% | 7.6% | 56 of 57 |
| Vacant homes | 5.4% | 14% | 54 of 57 |
| Wood or propane heat | 3.3% | 19% | 53 of 57 |
| Nights at 20°F or colder | 28/yr | 55/yr | 55 of 57 |
| Days with 1 inch+ of rain | 8.4/yr | 6/yr | 8 of 57 |
| Freeze-thaw days | 85/yr | 101/yr | 51 of 57 |
| Muggy nights (65°F+) | 48/yr | 12/yr | 3 of 57 |
Rank 1 is the highest value. Bars run from the lowest to the highest New York county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Westchester County: freezing from December to March, heavy rain in July, September and October.
Sources: U.S. Census Bureau, ACS 2024 5-year estimates (2020-2024); weather from NOAA nClimGrid-Daily county averages (EpiNOAA), 2015–2024, averaged across the county; county boundaries from Census TIGER. Reviewed 2026-10-21. Methodology