Hurricanes and Tornadoes That Hit Whippany, NJ

The nearest NOAA station with 1991–2020 climate normals is Boonton 1 SE, NJ, 5 miles north of Whippany at 280 feet. July is the warmest, with an average high of 85°F and low of 64°F; January is the coolest, at 38°F and 21°F. June is the wettest at 4.9 inches of precipitation on average and February the driest at 2.8 inches; the year adds up to 49.3 inches over 83 days with at least a tenth of an inch. June to November, the hurricane season months, bring 54% of the year's precipitation (26.6 of 49.3 inches); the other six months are drier. September has brought the most of the 42 tropical systems that passed within 75 miles (17); a normal September there has highs of 77°F and 4.7 inches of precipitation. Highs reach 90°F on about 16 days a year, almost all from June to September. Lows fall below freezing on about 124 nights a year. That 49.3 inches is more than at 31 of the 51 New Jersey stations used on this site (61%). Florham Park, 4 miles southeast, has its own station (Canoe Brook, NJ): 50.4 inches a year, 1.1 more than here, and a July average high of 86°F against 85°F.

Water temperature at the NOAA tide station The Battery, NY, 23 miles east, averaged 74°F in August and 39°F in February over 2021–2025. No month averaged 80°F. Sea level at the Bergen Point tide gauge, 19 miles from Whippany, has risen 1.86 ± 0.13 inches per decade from 1981 to 2024, NOAA's linear trend; at that pace it is 18.6 inches in a hundred years. That is faster than at 114 of the 144 U.S. gauges with a NOAA trend.

Since 1996, the National Weather Service has logged 404 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Whippany: 269 thunderstorm wind reports, 67 flash floods, 44 floods, 14 lightning strikes and 10 heavy rain events. They killed 5 people and injured 13, and the NWS estimated $18.0 million in property and crop damage. The strongest thunderstorm gust on record here was 92 mph, on July 1, 2013. August has had the most flash floods, 27 of 67. Of the 455 New Jersey cities on this site with a flash flood on record, 212 have had fewer than Whippany.

Flood insurance policyholders in Whippany's ZIP code 07981 have filed 76 claims with the National Flood Insurance Program since 1979, and were paid $3.5 million for buildings and contents, in the dollars of each year. The most came from Hurricane Irene in 2011: 21 claims (28% of all) and $1.7 million, then Hurricane Floyd in 1999 with 15 and Flooding in 1996 with 10. 74% 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, 184 have fewer than Whippany.