Hurricanes and Tornadoes That Hit Upper Darby, PA

The nearest NOAA station with 1991–2020 climate normals is Phila Franklin Inst, PA, 5 miles east of Upper Darby at 60 feet. July is the warmest, with an average high of 89°F and low of 71°F; January is the coolest, at 42°F and 28°F. August is the wettest at 5.0 inches of precipitation on average and February the driest at 3.3 inches; the year adds up to 50.9 inches over 82 days with at least a tenth of an inch. June to November, the hurricane season months, bring 53% of the year's precipitation (27.1 of 50.9 inches); the other six months are drier. September has brought the most of the 39 tropical systems that passed within 75 miles (14); a normal September there has highs of 80°F and 4.9 inches of precipitation. Highs reach 90°F on about 40 days a year, almost all from May to September. Lows fall below freezing on about 62 nights a year. Snowfall averages 16.1 inches a year, most of it in January. That 50.9 inches is more than at 136 of the 148 Pennsylvania stations used on this site (92%). Drexel Hill, 2 miles west, has its own station (Philadelphia International Airport, PA): 44.2 inches a year, 6.7 less than here, and a July average high of 88°F against 89°F.

Water temperature at the NOAA tide station Philadelphia, PA, 7 miles east, averaged 80°F in July and 38°F in February over 2021–2025. It averaged 80°F or warmer from July. Sea level at the Philadelphia tide gauge, 7 miles from Upper Darby, has risen 1.24 ± 0.04 inches per decade from 1900 to 2025, NOAA's linear trend; at that pace it is 12.4 inches in a hundred years. That is faster than at 73 of the 144 U.S. gauges with a NOAA trend.

Since 1996, the National Weather Service has logged 907 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Upper Darby: 557 thunderstorm wind reports, 228 flash floods, 81 floods, 27 lightning strikes and 14 heavy rain events. They killed 9 people and injured 40, and the NWS estimated $113.5 million in property and crop damage. The strongest thunderstorm gust on record here was 105 mph, on April 4, 2025. July has had the most flash floods, 70 of 228. Of the 788 Pennsylvania cities on this site with a flash flood on record, 771 have had fewer than Upper Darby.

Flood insurance policyholders in Upper Darby's ZIP code 19082 have filed 361 claims with the National Flood Insurance Program since 1978, and were paid $5.0 million for buildings and contents, in the dollars of each year. The most came from Hurricane Isaias in 2020: 46 claims (13% of all) and $2.2 million, then Tropical Storm Lee in 2011 with 23 and Hurricane Floyd in 1999 with 19. The year with the most claims was 2004, with 86. 27% of the claims carry the name of a storm or flood event; the rest have no event name. Of the 553 Pennsylvania cities on this site with 10 or more claims, 509 have fewer than Upper Darby.