Dauphin County, Pennsylvania · Harrisburg
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Pipes freeze in Dauphin County on about 28 nights a year, mostly November to March. Older homes, 39% of the stock here, are most at risk.
Basements flood here mostly in September. Dauphin County averages 8.9 days a year with an inch of rain or more.
Sewage backups in Dauphin County spike on heavy-rain days, about 8.9 a year, when sewer mains fill up and water finds the lowest drain.
Dauphin County's wettest day in the 2015–2024 record brought 4.15 inches, and about 88 freeze-thaw days a year mean ice dams in some winters.
6% of occupied homes in Dauphin County heat mainly with wood or propane, below the Pennsylvania county median of 10%.
About 45 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
Dauphin County covers 525 square miles of southern Pennsylvania, with about 289,593 residents and 127,828 homes. Harrisburg is the county seat; Colonial Park, Hershey and Progress are the next largest communities. The county's median home was built in 1972.
46/100 Water Damage Risk Index: Elevated Dauphin County ranks 43 of 67 Pennsylvania counties. See the statewide ranking and method.The three factors where Dauphin County ranks highest compared with other Pennsylvania counties.
Dauphin County is milder than most of Pennsylvania, but not mild enough to skip winterizing. From 2015–2024 it averaged 28 nights a year at 20°F or colder, the range where pipes in exterior walls, crawl spaces and unheated garages freeze, and 104 nights at or below 32°F. That ranks 54th of 67 counties.
The longest cold spell was straight 14 days without the temperature rising above freezing, ending in January 2018. The coldest night reached about -4°F on February 24, 2015. Burst pipes usually show up when a spell like that breaks and the ice thaws.
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.
On average the first fall freeze arrives around Nov 1 and the last spring freeze around Apr 16.
Heavy rain is a bigger factor here than in most of Pennsylvania. About 8.9 days a year bring an inch or more (20th of 67), most often in September, out of 46 inches of total precipitation. On September 2, 2021, 4.15 inches fell in a single day. Multi-day storms matter most for basements; the wettest three days on record here totaled 7.88 inches (through July 24, 2018).
Freeze-thaw days, below freezing overnight and above it by afternoon, come about 88 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
62% of homes in Dauphin County predate 1980, close to the Pennsylvania county median of 66%, which ranks 42nd of Pennsylvania's 67 counties.
17% of homes were built in 2000 or later, more than in most of Pennsylvania. Newer plumbing rarely corrodes, so damage here tends to come from appliance supply lines, water heaters, sump pumps and storms.
Renters occupy 37% 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
Dauphin County averages 45 warm, muggy nights a year (lows of 65°F or more) and gets the most rain in July. Mold grows when indoor humidity stays above about 60%, the EPA's ceiling. A basement dehumidifier set to 50% and drying anything wet within 24 to 48 hours prevents most problems.
Mold remediation: what to expectBy main heating fuel, Dauphin County homes break down as 38% utility gas, 38% electric, 5% propane and 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 Dauphin County. The largest communities by population:
Population from ACS 2020-2024 5-year estimates. Townships and unincorporated areas are covered too.
Nearby
Northumberland and Schuylkill get more pipe-freeze nights than Dauphin. Schuylkill County has the oldest housing nearby, with 79% of homes built before 1980.
By the numbers
| Factor | Dauphin | Pennsylvania median | Rank |
|---|---|---|---|
| Homes built before 1960 | 39% | 42% | 45 of 67 |
| Homes built before 1980 | 62% | 66% | 42 of 67 |
| Homes built 2000 or later | 17% | 13% | 17 of 67 |
| Manufactured or mobile homes | 2.6% | 6.6% | 58 of 67 |
| Vacant homes | 5.1% | 12% | 58 of 67 |
| Wood or propane heat | 6% | 10% | 56 of 67 |
| Nights at 20°F or colder | 28/yr | 37/yr | 54 of 67 |
| Days with 1 inch+ of rain | 8.9/yr | 7/yr | 20 of 67 |
| Freeze-thaw days | 88/yr | 98/yr | 58 of 67 |
| Muggy nights (65°F+) | 45/yr | 16/yr | 9 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 Dauphin County: freezing from November to March, heavy rain in April, August and September.
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