Hurricanes and Tornadoes That Hit Port Deposit, MD

The nearest NOAA station with 1991–2020 climate normals is Conowingo Dam, MD, 5 miles northwest of Port Deposit at 40 feet. July is the warmest, with an average high of 88°F and low of 69°F; January is the coolest, at 40°F and 25°F. September is the wettest at 5.1 inches of precipitation on average and February the driest at 2.6 inches; the year adds up to 48.2 inches over 82 days with at least a tenth of an inch. June to November, the hurricane season months, bring 55% of the year's precipitation (26.5 of 48.2 inches); the other six months are drier. September has brought the most of the 34 tropical systems that passed within 75 miles (12); a normal September there has highs of 79°F and 5.1 inches of precipitation. Highs reach 90°F on about 37 days a year, almost all from May to September. Lows fall below freezing on about 106 nights a year. That 48.2 inches is more than at 36 of the 41 Maryland stations used on this site (88%). Havre De Grace, 5 miles south, has its own station (Aberdeen Phillips Field, MD): 47.2 inches a year, 1.0 less than here, and a July average high of 86°F against 88°F.

Water temperature at the NOAA tide station Chesapeake City, MD, 16 miles southeast, averaged 84°F in July and 38°F in January over 2021–2025. It averaged 80°F or warmer from July to August. Sea level at the Chesapeake City tide gauge, 16 miles from Port Deposit, has risen 1.76 ± 0.12 inches per decade from 1972 to 2025, NOAA's linear trend; at that pace it is 17.6 inches in a hundred years. That is faster than at 111 of the 144 U.S. gauges with a NOAA trend.

Since 1996, the National Weather Service has logged 405 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Port Deposit: 299 thunderstorm wind reports, 47 floods, 44 flash floods, 8 lightning strikes and 7 heavy rain events. They killed 3 people and injured 6, and the NWS estimated $45.0 million in property and crop damage. The strongest thunderstorm gust on record here was 85 mph, on May 11, 2013. July has had the most flash floods, 16 of 44. Of the 239 Maryland cities on this site with a flash flood on record, 137 have had fewer than Port Deposit.

Flood insurance policyholders in Port Deposit's ZIP code 21904 have filed 111 claims with the National Flood Insurance Program since 1978, and were paid $1.2 million for buildings and contents, in the dollars of each year. The most came from Flooding in 1996: 29 claims (26% of all) and $396,000. The year with the most claims was 2011, with 37. 35% of the claims carry the name of a storm or flood event; the rest have no event name. Of the 150 Maryland cities on this site with 10 or more claims, 116 have fewer than Port Deposit.