Hurricanes and Tornadoes That Hit Williamstown, NJ

The nearest NOAA station with 1991–2020 climate normals is Hammonton 1 NE, NJ, 8 miles east of Williamstown at 125 feet. July is the warmest, with an average high of 87°F and low of 67°F; January is the coolest, at 42°F and 24°F. August is the wettest at 4.7 inches of precipitation on average and February the driest at 2.9 inches; the year adds up to 47.7 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 (25.2 of 47.7 inches); the other six months are drier. September has brought the most of the 51 tropical systems that passed within 75 miles (20); a normal September there has highs of 79°F and 4.1 inches of precipitation. Highs reach 90°F on about 28 days a year, almost all from May to September. Lows fall below freezing on about 105 nights a year. Snowfall averages 19.0 inches a year, most of it in February. That 47.7 inches is more than at 22 of the 51 New Jersey stations used on this site (43%). Franklinville, 6 miles west, has its own station (Woodstown Pittsgrov 4E, NJ): 46.7 inches a year, 1.0 less than here, and a July average high of 89°F against 87°F.

Water temperature at the NOAA tide station Philadelphia, PA, 22 miles northwest, 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, 22 miles from Williamstown, 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 253 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Williamstown: 164 thunderstorm wind reports, 29 flash floods, 25 heavy rain events, 24 floods and 11 lightning strikes. They killed 1 person and injured 1, and the NWS estimated $32.8 million in property and crop damage. The strongest thunderstorm gust on record here was 100 mph, on May 16, 2025. June has had the most flash floods, 15 of 29. Of the 455 New Jersey cities on this site with a flash flood on record, 109 have had fewer than Williamstown.

Flood insurance policyholders in Williamstown's ZIP code 08094 have filed 57 claims with the National Flood Insurance Program since 1979, and were paid $242,000 for buildings and contents, in the dollars of each year. The year with the most claims was 2011, with 12. 56% of the claims carry the name of a storm or flood event; the rest have no event name. Of the 395 New Jersey cities on this site with 10 or more claims, 161 have fewer than Williamstown.