Hurricanes and Tornadoes That Hit Berwyn, PA

The nearest NOAA station with 1991–2020 climate normals is Phoenixville 1 E, PA, 6 miles north of Berwyn at 85 feet. July is the warmest, with an average high of 88°F and low of 66°F; January is the coolest, at 41°F and 23°F. July is the wettest at 4.6 inches of precipitation on average and February the driest at 2.9 inches; the year adds up to 45.3 inches over 76 days with at least a tenth of an inch. June to November, the hurricane season months, bring 54% of the year's precipitation (24.6 of 45.3 inches); the other six months are drier. September has brought the most of the 34 tropical systems that passed within 75 miles (15); a normal September there has highs of 79°F and 4.4 inches of precipitation. Highs reach 90°F on about 29 days a year, almost all from May to September. Lows fall below freezing on about 117 nights a year. That 45.3 inches is more than at 81 of the 148 Pennsylvania stations used on this site (55%). Devon, 2 miles east, has its own station (Norristown, PA): 50.7 inches a year, 5.4 more than here, and a July average high of 89°F against 88°F.

Water temperature at the NOAA tide station Marcus Hook, PA, 16 miles south, 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, 18 miles from Berwyn, 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 666 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Berwyn: 461 thunderstorm wind reports, 149 flash floods, 31 floods, 14 lightning strikes and 11 heavy rain events. They killed 4 people and injured 8, and the NWS estimated $50.5 million in property and crop damage. The strongest thunderstorm gust on record here was 105 mph, on April 4, 2025. August has had the most flash floods, 61 of 149. Of the 788 Pennsylvania cities on this site with a flash flood on record, 712 have had fewer than Berwyn.

Flood insurance policyholders in Berwyn's ZIP code 19312 have filed 18 claims with the National Flood Insurance Program since 1979, and were paid $59,000 for buildings and contents, in the dollars of each year. 39% 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, 99 have fewer than Berwyn.