Hurricanes and Tornadoes That Hit Clinton, CT

The nearest NOAA station with 1991–2020 climate normals is New Haven Tweed Airport, CT, 19 miles west of Clinton at 3 feet. July is the warmest, with an average high of 82°F and low of 66°F; January is the coolest, at 38°F and 23°F. April is the wettest at 4.2 inches of precipitation on average and January the driest at 2.7 inches; the year adds up to 41.8 inches over 74 days with at least a tenth of an inch. June to November, the hurricane season months, bring 51% of the year's precipitation (21.4 of 41.8 inches); the other six months are drier. September has brought the most of the 54 tropical systems that passed within 75 miles (22); a normal September there has highs of 75°F and 4.0 inches of precipitation. Highs reach 90°F on about 6 days a year, almost all from July to August. Lows fall below freezing on about 102 nights a year. That 41.8 inches is more than at 1 of the 27 Connecticut stations used on this site (4%). Westbrook, 3 miles east, has its own station (Groton New London Airport, CT): 39.2 inches a year, 2.6 less than here, and a July average high of 80°F against 82°F.

Water temperature at the NOAA tide station New Haven, CT, 20 miles west, averaged 75°F in August and 37°F in February over 2021–2025. No month averaged 80°F. Sea level at the New London tide gauge, 23 miles from Clinton, has risen 1.16 ± 0.04 inches per decade from 1938 to 2025, NOAA's linear trend; at that pace it is 11.6 inches in a hundred years. That is faster than at 66 of the 144 U.S. gauges with a NOAA trend.

Since 1996, the National Weather Service has logged 66 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Clinton: 53 thunderstorm wind reports, 6 lightning strikes, 4 flash floods and 3 floods. They killed 1 person and injured 5, and the NWS estimated $542,000 in property and crop damage. The strongest thunderstorm gust on record here was 81 mph, on June 2, 2000.

Flood insurance policyholders in Clinton's ZIP code 06413 have filed 450 claims with the National Flood Insurance Program since 1978, and were paid $8.1 million for buildings and contents, in the dollars of each year. The most came from Hurricane Sandy in 2012: 115 claims (26% of all) and $3.6 million, then Hurricane Irene in 2011 with 96 and Hurricane Gloria in 1985 with 51. 78% 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, 110 have fewer than Clinton.