The Havre de Grace plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
Partly cloudy
Partly cloudy; warmer
Partly cloudy
Sunny
Partly cloudy
Mostly sunny
Mostly sunny
80° on Nov. 15, 1993, the hottest reading for this week of the year since 1919. Next is 77° in 1955.
Havre de Grace’s center stands about 40 ft above sea level. Within three miles the land runs from 0 ft to 430 ft, a difference of 430 ft: hilly country. Open water lies within three miles. The highest named summit within 15 miles is Goat Hill, about 500 ft, 12 miles north.
Under the town center the state geologic map shows Lowland Deposits (fine-detrital, coarse-detrital), from the Pleistocene, less than 2.6 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 39×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Metagabbro, amphibolite. Age: Paleozoic, 252 to 542 million years old. About 5 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Sand. Age: Cretaceous, 66 to 145 million years old. About 2 mi of the line.
Muscovite-schist. Age: Proterozoic, 542 to 2,500 million years old. About 1 mi of the line.
Gabbro. Age: Proterozoic to Paleozoic, 252 to 2,500 million years old. About 1 mi of the line.
Gneiss, quartz-diorite, granodiorite. Age: Neoproterozoic to Middle Cambrian, 500 to 600 million years old. About 0.6 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit along the line are not listed.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in Havre de Grace reaches Chesapeake Bay and the Atlantic Ocean by way of the Susquehanna: about 2 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Havre de Grace; river miles along the main stem, rounded.
Havre de Grace has a humid subtropical climate. Summer afternoons average 86° in July; winter nights fall to about 25° in January. About 47 inches of rain fall in a normal year.
On November 14 Havre de Grace normally reaches 56° and falls to 37°. The record high is 77°, in 1955; the record low 21°, in 1986. The most rain on this date, 1.83 in, fell in 1972.
Normals 1991–2020 and records since 1919 at Aberdeen Phillips Field, 7 miles southwest. NOAA, through RCC-ACIS.
