Greene County, Pennsylvania · Waynesburg
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Pipes freeze in Greene County on about 29 nights a year, mostly November to March. Older homes, 50% of the stock here, are most at risk.
October brings the most downpours to Greene County, part of 6.1 heavy-rain days a year. Check the sump first.
50% of homes here predate 1960, when clay and cast iron sewer laterals were standard. Roots and cracks in those lines are a common cause of backups.
Greene County's wettest day in the 2015–2024 record brought 3.44 inches, and about 91 freeze-thaw days a year mean ice dams in some winters.
9% of occupied homes in Greene County heat mainly with wood or propane, close to the Pennsylvania county median of 10%.
About 22 nights a year here stay at 65°F or warmer, so basements and crawl spaces can grow mold even without a leak.
Local risk profile
With 16,201 homes and around 34,835 residents, Greene County is 576 square miles of southwest Pennsylvania. Waynesburg is the county seat; Fairdale, Nemacolin and Morrisville are the next largest communities. Half the homes here were built before 1960, half after.
45/100 Water Damage Risk Index: Elevated Greene County ranks 45 of 67 Pennsylvania counties. See the statewide ranking and method.The three factors where Greene County ranks highest compared with other Pennsylvania counties.
Winters here are on the gentler end for Pennsylvania, and pipes still freeze. It averaged 110 freezing nights a year over 2015–2024, 29 of them at 20°F or colder, cold enough for pipes in outside walls and crawl spaces to freeze. Among 67 Pennsylvania counties that's 50th.
On February 20, 2015 the low fell to about -7°F, and in the stretch ending January 2018 the county went 13 days in a row below freezing. Leaks from split pipes typically appear the day the thaw arrives.
The freeze season here runs November 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.
Freezing nights typically start around Oct 29 and end around Apr 28.
Greene gets fewer downpours than most Pennsylvania counties, but they still fill basements. About 6.1 days a year bring an inch or more (48th of 67), most often in October, out of 45.9 inches of total precipitation. On September 10, 2018, 3.44 inches fell in a single day. The worst three-day stretch dropped 6.15 inches, ending September 11, 2018, the kind of soaking that overwhelms sump pumps and storm sewers.
The temperature crosses 32°F in both directions on roughly 91 days a year. Each cycle melts and refreezes water at roof edges and in foundation cracks, which is how ice dams and basement seepage get started.
Housing
Pennsylvania's 67 counties range widely in housing age; Greene ranks 29th, with 70% of its homes built before 1980.
In Greene County 50% 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.
Here 16% of housing is manufactured homes. Check the skirting and the heat tape on the main water line every fall, because that one exposed line is what freezes.
Beyond water
Summer nights that don't drop below 65°F, a good marker of humid air, come about 22 times a year here, above the Pennsylvania county median of 16. Keep indoor humidity under 60%, as the EPA advises, and dry any leak within 24 to 48 hours; in a humid month a wet basement left alone won't dry by itself.
Mold remediation: what to expectHeating fuel matters for fire risk. In Greene County it's 50% utility gas, 27% electric, 6% propane and 4% wood. Most homes here heat with gas or electricity, so cooking and electrical faults are the likelier fire sources. Even a contained kitchen fire can send soot through the ductwork to every room.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Greene County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Fayette gets more pipe-freeze nights than Greene. Fayette County has the oldest housing nearby, with 74% of homes built before 1980.
By the numbers
| Factor | Greene | Pennsylvania median | Rank |
|---|---|---|---|
| Homes built before 1960 | 50% | 42% | 18 of 67 |
| Homes built before 1980 | 70% | 66% | 29 of 67 |
| Homes built 2000 or later | 13% | 13% | 35 of 67 |
| Manufactured or mobile homes | 16% | 6.6% | 2 of 67 |
| Vacant homes | 12% | 12% | 33 of 67 |
| Wood or propane heat | 9.1% | 10% | 39 of 67 |
| Nights at 20°F or colder | 29/yr | 37/yr | 50 of 67 |
| Days with 1 inch+ of rain | 6.1/yr | 7/yr | 48 of 67 |
| Freeze-thaw days | 91/yr | 98/yr | 50 of 67 |
| Muggy nights (65°F+) | 22/yr | 16/yr | 28 of 67 |
Rank 1 is the highest value. Bars run from the lowest to the highest Pennsylvania county; the tick marks the median; orange means higher water damage risk than the median, green means lower.
Questions
Peak risk months in Greene County: freezing from November to March, heavy rain in April, 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