Hurricanes and Tornadoes That Hit Saint Leonard, MD

The nearest NOAA station with 1991–2020 climate normals is Patuxent River NAS, MD, 11 miles southeast of Saint Leonard at 39 feet. July is the warmest, with an average high of 87°F and low of 71°F; January is the coolest, at 45°F and 30°F. August is the wettest at 4.7 inches of precipitation on average and February the driest at 2.8 inches; the year adds up to 45.4 inches over 72 days with at least a tenth of an inch. June to November, the hurricane season months, bring 55% of the year's precipitation (24.8 of 45.4 inches); the other six months are drier. September has brought the most of the 50 tropical systems that passed within 75 miles (19); a normal September there has highs of 79°F and 4.2 inches of precipitation. Highs reach 90°F on about 26 days a year, almost all from May to September. Lows fall below freezing on about 68 nights a year. Snowfall averages 12.5 inches a year, most of it in February. That 45.4 inches is more than at 19 of the 41 Maryland stations used on this site (46%). Port Republic, 3 miles northwest, has its own station (Mechanicsville 5 NE, MD): 48.1 inches a year, 2.7 more than here, and a July average high of 85°F against 87°F.

Water temperature at the NOAA tide station Solomons Island, MD, 10 miles south, averaged 82°F in July and 41°F in February over 2021–2025. It averaged 80°F or warmer from July to August. Sea level at the Solomons Island tide gauge, 10 miles from Saint Leonard, has risen 1.62 ± 0.05 inches per decade from 1937 to 2025, NOAA's linear trend; at that pace it is 16.2 inches in a hundred years. That is faster than at 99 of the 144 U.S. gauges with a NOAA trend.

Since 1996, the National Weather Service has logged 186 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Saint Leonard: 162 thunderstorm wind reports, 13 floods, 9 flash floods and 2 lightning strikes. They killed 0 people and injured 1, and the NWS estimated $1.3 million in property and crop damage. The strongest thunderstorm gust on record here was 104 mph, on April 21, 2000. Of the 239 Maryland cities on this site with a flash flood on record, 15 have had fewer than Saint Leonard.

Flood insurance policyholders in Saint Leonard's ZIP code 20685 have filed 51 claims with the National Flood Insurance Program since 1978, and were paid $786,000 for buildings and contents, in the dollars of each year. The most came from Hurricane Isabel in 2003: 19 claims (37% of all) and $571,000. 49% 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, 81 have fewer than Saint Leonard.