Hurricanes and Tornadoes That Hit Eldersburg, MD

The nearest NOAA station with 1991–2020 climate normals is Damascus 3 SSW, MD, 17 miles southwest of Eldersburg at 700 feet. July is the warmest, with an average high of 84°F and low of 66°F; January is the coolest, at 39°F and 25°F. September is the wettest at 4.8 inches of precipitation on average and February the driest at 3.0 inches; the year adds up to 48.0 inches over 80 days with at least a tenth of an inch. June to November, the hurricane season months, bring 54% of the year's precipitation (25.7 of 48.0 inches); the other six months are drier. August has brought the most of the 25 tropical systems that passed within 75 miles (9); a normal August there has highs of 83°F and 4.2 inches of precipitation. Highs reach 90°F on about 13 days a year, almost all from June to August. Lows fall below freezing on about 98 nights a year. Snowfall averages 31.4 inches a year, most of it in February. That 48.0 inches is more than at 33 of the 41 Maryland stations used on this site (80%). Marriottsville, 4 miles southeast, has its own station (Md Sci Ctr Baltimore, MD): 44.0 inches a year, 4.0 less than here, and a July average high of 90°F against 84°F.

Water temperature at the NOAA tide station Baltimore, MD, 23 miles southeast, averaged 83°F in July and 40°F in February over 2021–2025. It averaged 80°F or warmer from July to August. Sea level at the Baltimore tide gauge, 23 miles from Eldersburg, has risen 1.30 ± 0.02 inches per decade from 1902 to 2025, NOAA's linear trend; at that pace it is 13.0 inches in a hundred years. That is faster than at 77 of the 144 U.S. gauges with a NOAA trend.

Since 1996, the National Weather Service has logged 336 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Eldersburg: 281 thunderstorm wind reports, 31 flash floods, 22 floods and 2 lightning strikes. They killed 2 people and injured 1, and the NWS estimated $4.2 million in property and crop damage. The strongest thunderstorm gust on record here was 90 mph, on July 22, 2019. July has had the most flash floods, 13 of 31. Of the 239 Maryland cities on this site with a flash flood on record, 99 have had fewer than Eldersburg.

Flood insurance policyholders in Eldersburg's ZIP code 21784 have filed 17 claims with the National Flood Insurance Program since 1978, and were paid $218,000 for buildings and contents, in the dollars of each year. 12% 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, 23 have fewer than Eldersburg.