Hurricanes and Tornadoes That Hit Exton, PA

The nearest NOAA station with 1991–2020 climate normals is W Chester 2 NW, PA, 5 miles south of Exton at 375 feet. July is the warmest, with an average high of 86°F and low of 64°F; January is the coolest, at 40°F and 20°F. September is the wettest at 5.7 inches of precipitation on average and February the driest at 3.1 inches; the year adds up to 51.0 inches over 79 days with at least a tenth of an inch. June to November, the hurricane season months, bring 54% of the year's precipitation (27.3 of 51.0 inches); the other six months are drier. September has brought the most of the 33 tropical systems that passed within 75 miles (13); a normal September there has highs of 78°F and 5.7 inches of precipitation. Highs reach 90°F on about 27 days a year, almost all from May to September. Lows fall below freezing on about 131 nights a year. Snowfall averages 30.5 inches a year, most of it in February. That 51.0 inches is more than at 138 of the 148 Pennsylvania stations used on this site (93%). Chester Springs, 3 miles north, has its own station (Phoenixville 1 E, PA): 45.3 inches a year, 5.7 less than here, and a July average high of 88°F against 86°F.

Water temperature at the NOAA tide station Marcus Hook, PA, 20 miles southeast, averaged 82°F in July and 39°F in January over 2021–2025. It averaged 80°F or warmer from July to August. Sea level at the Philadelphia tide gauge, 27 miles from Exton, 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 527 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Exton: 375 thunderstorm wind reports, 99 flash floods, 37 floods, 9 lightning strikes and 7 heavy rain events. They killed 3 people and injured 10, and the NWS estimated $1.3 million in property and crop damage. The strongest thunderstorm gust on record here was 75 mph, on September 23, 2003. July has had the most flash floods, 35 of 99. Of the 788 Pennsylvania cities on this site with a flash flood on record, 673 have had fewer than Exton.

Flood insurance policyholders in Exton's ZIP code 19341 have filed 80 claims with the National Flood Insurance Program since 1978, and were paid $1.4 million for buildings and contents, in the dollars of each year. The most came from Hurricane Irene in 2011: 13 claims (16% of all) and $157,000. 41% 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, 342 have fewer than Exton.