Hurricanes and Tornadoes That Hit Hockessin, DE

The nearest NOAA station with 1991–2020 climate normals is Avondale 2 N, PA, 7 miles northwest of Hockessin at 400 feet. July is the warmest, with an average high of 84°F and low of 64°F; January is the coolest, at 39°F and 23°F. September is the wettest at 4.5 inches of precipitation on average and February the driest at 3.1 inches; the year adds up to 47.1 inches over 80 days with at least a tenth of an inch. June to November, the hurricane season months, bring 52% of the year's precipitation (24.6 of 47.1 inches); the other six months are drier. September has brought the most of the 36 tropical systems that passed within 75 miles (14); a normal September there has highs of 75°F and 4.5 inches of precipitation. Highs reach 90°F on about 8 days a year, almost all from June to August. Lows fall below freezing on about 109 nights a year. That 47.1 inches is more than at 6 of the 11 Delaware stations used on this site (55%). Wilmington, 6 miles east, has its own station (Wilmington Porter Rsch, DE): 50.5 inches a year, 3.4 more than here, and the same July average high, 84°F.

Water temperature at the NOAA tide station Marcus Hook, PA, 15 miles east, 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 Reedy Point tide gauge, 17 miles from Hockessin, has risen 1.55 ± 0.09 inches per decade from 1956 to 2025, NOAA's linear trend; at that pace it is 15.5 inches in a hundred years. That is faster than at 93 of the 144 U.S. gauges with a NOAA trend.

Since 1996, the National Weather Service has logged 537 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Hockessin: 362 thunderstorm wind reports, 88 flash floods, 50 floods, 21 lightning strikes and 16 heavy rain events. They killed 3 people and injured 16, and the NWS estimated $11.2 million in property and crop damage. The strongest thunderstorm gust on record here was 81 mph, on August 7, 2023. August has had the most flash floods, 35 of 88. Of the 37 Delaware cities on this site with a flash flood on record, 34 have had fewer than Hockessin.

Flood insurance policyholders in Hockessin's ZIP code 19707 have filed 47 claims with the National Flood Insurance Program since 1979, and were paid $409,000 for buildings and contents, in the dollars of each year. The year with the most claims was 2003, with 14. 23% of the claims carry the name of a storm or flood event; the rest have no event name. Of the 24 Delaware cities on this site with 10 or more claims, 6 have fewer than Hockessin.