Hurricanes and Tornadoes That Hit Greenwich, CT

The nearest NOAA station with 1991–2020 climate normals is Westchester Co Airport, NY, 4 miles northwest of Greenwich at 379 feet. July is the warmest, with an average high of 83°F and low of 65°F; January is the coolest, at 37°F and 22°F. September is the wettest at 4.9 inches of precipitation on average and February the driest at 2.5 inches; the year adds up to 47.7 inches over 77 days with at least a tenth of an inch. June to November, the hurricane season months, bring 54% of the year's precipitation (25.6 of 47.7 inches); the other six months are drier. September has brought the most of the 48 tropical systems that passed within 75 miles (21); a normal September there has highs of 74°F and 4.9 inches of precipitation. Highs reach 90°F on about 10 days a year, almost all from June to August. Lows fall below freezing on about 105 nights a year. That 47.7 inches is more than at 9 of the 27 Connecticut stations used on this site (33%). Cos Cob, 2 miles east, has its own station (Stamford 5 N, CT): 51.5 inches a year, 3.8 more than here, and a July average high of 85°F against 83°F.

Water temperature at the NOAA tide station Kings Point, NY, 17 miles south, averaged 74°F in August and 38°F in February over 2021–2025. No month averaged 80°F. Sea level at the Kings Point tide gauge, 17 miles from Greenwich, has risen 1.08 ± 0.04 inches per decade from 1931 to 2025, NOAA's linear trend; at that pace it is 10.8 inches in a hundred years. That is faster than at 62 of the 144 U.S. gauges with a NOAA trend.

Since 1996, the National Weather Service has logged 299 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Greenwich: 151 thunderstorm wind reports, 122 flash floods, 19 floods, 5 lightning strikes and 2 heavy rain events. They killed 5 people and injured 5, and the NWS estimated $11.6 million in property and crop damage. The strongest thunderstorm gust on record here was 81 mph, on June 16, 2008. July has had the most flash floods, 44 of 122. Of the 186 Connecticut cities on this site with a flash flood on record, 185 have had fewer than Greenwich.

Flood insurance policyholders in Greenwich's 2 ZIP codes have filed 528 claims with the National Flood Insurance Program since 1978, and were paid $14.5 million for buildings and contents, in the dollars of each year. The most came from Hurricane Ida in 2021: 126 claims (24% of all) and $7.1 million, then Hurricane Irene in 2011 with 48 and Hurricane Sandy in 2012 with 47. 65% of the claims carry the name of a storm or flood event; the rest have no event name. Of the 128 Connecticut cities on this site with 10 or more claims, 113 have fewer than Greenwich.