Warren County, Pennsylvania · Warren
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Pipes freeze in Warren County on about 50 nights a year, mostly November to April. Older homes, 51% of the stock here, are most at risk.
Basements flood here mostly in June. Warren County averages 5.9 days a year with an inch of rain or more.
Sewage backups in Warren County spike on heavy-rain days, about 5.9 a year, when sewer mains fill up and water finds the lowest drain.
Warren County's wettest day in the 2015–2024 record brought 2.52 inches, and about 101 freeze-thaw days a year mean ice dams in some winters.
18% of occupied homes in Warren County heat mainly with wood or propane, above the Pennsylvania county median of 10%.
About 8 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 21,629 homes and around 37,920 residents, Warren County is 884 square miles of northwest Pennsylvania. Besides Warren, the county seat, the biggest communities are North Warren, Youngsville and Russell. It has some of the oldest housing in the state: the median home went up in 1959.
57/100 Water Damage Risk Index: Elevated Warren County ranks 17 of 67 Pennsylvania counties. See the statewide ranking and method.The three factors where Warren County ranks highest compared with other Pennsylvania counties.
Warren is on the colder side of Pennsylvania for pipes. In the 2015–2024 record the county logged about 50 nights a year at or below 20°F (9th of 67) and 141 below freezing. Twenty degrees is roughly where uninsulated pipes start to freeze.
The longest cold spell was straight 19 days without the temperature rising above freezing, ending in March 2015. The coldest night reached about -21°F on February 16, 2015. Burst pipes usually show up when a spell like that breaks and the ice thaws.
The freeze season here runs November to April, 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 Oct 16 and the last spring freeze around May 10.
Warren gets fewer downpours than most Pennsylvania counties, but they still fill basements. About 5.9 days a year bring an inch or more (50th of 67), most often in June, out of 47.3 inches of total precipitation. On November 12, 2022, 2.52 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 3.25 inches (through April 13, 2024).
The temperature crosses 32°F in both directions on roughly 101 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
76% of homes in Warren County predate 1980, above the Pennsylvania county median of 66%, which ranks 10th of Pennsylvania's 67 counties.
In Warren County 51% 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.
10% of homes are manufactured or mobile homes, above the Pennsylvania county median of 6.6%. Their water lines run under the floor behind the skirting, so a torn skirt or failed heat tape freezes them faster than lines in a site-built house.
With 26% of homes empty at survey time, landlords and seasonal owners should shut off the main or schedule checks in winter. An unheated vacant house is also where many policies limit freeze coverage.
Beyond water
About 8 nights a year in Warren County stay at 65°F or warmer, a sign of muggy summer air (58th of 67 counties). June is the wettest month. 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 Warren County it's 68% utility gas, 9% electric, 11% propane and 8% wood. Wood and propane heat are above the Pennsylvania norm. Annual chimney and vent inspection, which the NFPA recommends, is one of the most effective fire-prevention habits for these homes.
Fire and smoke cleanup: first stepsCoverage
Calls connect to restoration companies that work across Warren County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
McKean gets more pipe-freeze nights than Warren. It also has the most heavy-rain days in its area. McKean County has the oldest housing nearby, with 78% of homes built before 1980.
By the numbers
| Factor | Warren | Pennsylvania median | Rank |
|---|---|---|---|
| Homes built before 1960 | 51% | 42% | 15 of 67 |
| Homes built before 1980 | 76% | 66% | 10 of 67 |
| Homes built 2000 or later | 8.4% | 13% | 61 of 67 |
| Manufactured or mobile homes | 9.5% | 6.6% | 18 of 67 |
| Vacant homes | 26% | 12% | 8 of 67 |
| Wood or propane heat | 18% | 10% | 15 of 67 |
| Nights at 20°F or colder | 50/yr | 37/yr | 9 of 67 |
| Days with 1 inch+ of rain | 5.9/yr | 7/yr | 50 of 67 |
| Freeze-thaw days | 101/yr | 98/yr | 22 of 67 |
| Muggy nights (65°F+) | 8/yr | 16/yr | 58 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 Warren County: freezing from November to April, heavy rain in June, July and August.
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