Hurricanes and Tornadoes That Hit Collegeville, PA

The nearest NOAA station with 1991–2020 climate normals is Graterford 1 E, PA, 3 miles northeast of Collegeville at 279 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. July is the wettest at 5.0 inches of precipitation on average and February the driest at 2.6 inches; the year adds up to 48.6 inches over 80 days with at least a tenth of an inch. June to November, the hurricane season months, bring 55% of the year's precipitation (26.6 of 48.6 inches); the other six months are drier. September has brought the most of the 32 tropical systems that passed within 75 miles (13); a normal September there has highs of 78°F and 4.9 inches of precipitation. Highs reach 90°F on about 21 days a year, almost all from June to September. Lows fall below freezing on about 137 nights a year. Snowfall averages 12.9 inches a year, most of it in February. That 48.6 inches is more than at 120 of the 148 Pennsylvania stations used on this site (81%). Royersford, 5 miles west, has its own station (Pottstown Limerick Airport, PA): 45.3 inches a year, 3.3 less than here, and a July average high of 84°F against 86°F.

Water temperature at the NOAA tide station Philadelphia, PA, 24 miles southeast, 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, 24 miles from Collegeville, 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 442 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Collegeville: 315 thunderstorm wind reports, 80 flash floods, 34 floods, 9 lightning strikes and 4 heavy rain events. They killed 4 people and injured 4, and the NWS estimated $22.7 million in property and crop damage. The strongest thunderstorm gust on record here was 110 mph, on May 29, 2019. August has had the most flash floods, 30 of 80. Of the 788 Pennsylvania cities on this site with a flash flood on record, 636 have had fewer than Collegeville.

Flood insurance policyholders in Collegeville's ZIP code 19426 have filed 330 claims with the National Flood Insurance Program since 1978, and were paid $10.9 million for buildings and contents, in the dollars of each year. The most came from Hurricane Ida in 2021: 46 claims (14% of all) and $5.0 million, then Flooding in 1996 with 30 and Hurricane Isaias in 2020 with 30. 62% 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, 503 have fewer than Collegeville.