The New Haven 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.
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3.70 inches of rain fell in two days, the most for this week of the year since records began in 1888. The next wettest, 3.52 inches, fell in 1957.
New Haven’s center stands about 380 ft above sea level. Within three miles the land runs from 330 ft to 510 ft, a difference of 180 ft: gently rolling country. The highest named summit within 15 miles is Grundy Hill, about 570 ft, 13 miles south-southeast.
Under the town center the state geologic map shows Bond Formation (shale, sandstone, limestone), from the Late Pennsylvanian, 304 to 307 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, sandstone, limestone. Age: Late Pennsylvanian, 304 to 307 million years old. About 9 mi of the line.
Shale, sandstone. Age: Carboniferous, 299 to 324 million years old. About 6 mi of the line.
Shale, limestone. Age: Late Pennsylvanian, 304 to 307 million years old. About 6 mi of the line.
Shale. Age: Late Pennsylvanian, 304 to 307 million years old. About 4 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
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 New Haven reaches the Gulf of America by way of the Ohio and the Mississippi: about 1,110 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of New Haven; river miles along the main stem, rounded.
New Haven has a humid subtropical climate. Summer afternoons average 88° in July; winter nights fall to about 23° in January. A normal year brings about 8 inches of snow; with the rain, that comes to about 47 inches of water.
On November 14 New Haven normally reaches 57° and falls to 36°. The record high is 83°, in 1955; the record low 12°, in 1986. The most rain on this date, 2.64 in, fell in 1957.
Normals 1991–2020 and records since 1888 at Mount Vernon, 13 miles east. NOAA, through RCC-ACIS.
