Hurricanes and Tornadoes That Hit Winthrop, MA

The nearest NOAA station with 1991–2020 climate normals is Boston Logan International Airport, MA, 2 miles southwest of Winthrop at 12 feet. July is the warmest, with an average high of 82°F and low of 66°F; January is the coolest, at 37°F and 23°F. December is the wettest at 4.3 inches of precipitation on average and February and August the driest at 3.2 inches; the year adds up to 43.7 inches over 77 days with at least a tenth of an inch. June to November, the hurricane season months, bring 50% of the year's precipitation (21.7 of 43.7 inches). September has brought the most of the 48 tropical systems that passed within 75 miles (19); a normal September there has highs of 73°F and 3.6 inches of precipitation. Highs reach 90°F on about 14 days a year, almost all from June to August. Lows fall below freezing on about 92 nights a year. Snowfall averages 49.2 inches a year, most of it in February. That 43.7 inches is more than at 8 of the 65 Massachusetts stations used on this site (12%). Nahant, 5 miles northeast, has its own station (Marblehead, MA): 48.2 inches a year, 4.5 more than here, and a July average high of 80°F against 82°F.

Sea level at the Boston tide gauge, 4 miles from Winthrop, has risen 1.17 ± 0.03 inches per decade from 1921 to 2025, NOAA's linear trend; at that pace it is 11.7 inches in a hundred years. That is faster than at 68 of the 144 U.S. gauges with a NOAA trend.

Since 1996, the National Weather Service has logged 463 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Winthrop: 274 thunderstorm wind reports, 105 floods, 55 flash floods and 29 lightning strikes. They killed 2 people and injured 23, and the NWS estimated $32.4 million in property and crop damage. The strongest thunderstorm gust on record here was 104 mph, on June 22, 1997. July has had the most flash floods, 35 of 55. Of the 339 Massachusetts cities on this site with a flash flood on record, 311 have had fewer than Winthrop.

Flood insurance policyholders in Winthrop's ZIP code 02152 have filed 1,226 claims with the National Flood Insurance Program since 1978, and were paid $7.2 million for buildings and contents, in the dollars of each year. The most came from The "Halloween" Storm in 1991: 286 claims (23% of all) and $2.3 million, then Flooding in 1978 with 251 and Not a named storm in 1979 with 149. 72% of the claims carry the name of a storm or flood event; the rest have no event name. Of the 229 Massachusetts cities on this site with 10 or more claims, 223 have fewer than Winthrop.