Hurricanes and Tornadoes That Hit Newtown Square, PA

The nearest NOAA station with 1991–2020 climate normals is Norristown, PA, 10 miles northeast of Newtown Square at 62 feet. July is the warmest, with an average high of 89°F and low of 67°F; January is the coolest, at 42°F and 23°F. August is the wettest at 5.0 inches of precipitation on average and February the driest at 3.0 inches; the year adds up to 50.7 inches over 86 days with at least a tenth of an inch. June to November, the hurricane season months, bring 53% of the year's precipitation (26.7 of 50.7 inches); the other six months are drier. September has brought the most of the 35 tropical systems that passed within 75 miles (15); a normal September there has highs of 80°F and 4.9 inches of precipitation. Highs reach 90°F on about 39 days a year, almost all from May to September. Lows fall below freezing on about 107 nights a year. Snowfall averages 25.3 inches a year, most of it in February. That 50.7 inches is more than at 133 of the 148 Pennsylvania stations used on this site (90%). Berwyn, 4 miles northwest, has its own station (Phoenixville 1 E, PA): 45.3 inches a year, 5.4 less than here, and a July average high of 88°F against 89°F.

Water temperature at the NOAA tide station Marcus Hook, PA, 12 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, 15 miles from Newtown Square, 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 763 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Newtown Square: 500 thunderstorm wind reports, 188 flash floods, 44 floods, 23 lightning strikes and 8 heavy rain events. They killed 7 people and injured 23, and the NWS estimated $57.6 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, 75 of 188. Of the 788 Pennsylvania cities on this site with a flash flood on record, 743 have had fewer than Newtown Square.

Flood insurance policyholders in Newtown Square's ZIP code 19073 have filed 36 claims with the National Flood Insurance Program since 1978, and were paid $417,000 for buildings and contents, in the dollars of each year. The year with the most claims was 2010, with 13. 25% 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, 213 have fewer than Newtown Square.