The Arrowhead Lake 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 1943. Next is 76° in 1955.
Arrowhead Lake’s center stands about 110 ft above sea level. Within three miles the land runs from 50 ft to 150 ft, a difference of 100 ft: gently rolling country.
Under the town center the state geologic map shows Cohansey Formation (sand), from the Middle Miocene, 12 to 14 million years old.
The section below crosses 3 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.
Sand. Age: Middle Miocene, 12 to 14 million years old. About 15 mi of the line.
Clay. Age: Early Miocene, 16 to 20 million years old. About 3 mi of the line.
Clay, sand. Age: Early Miocene, 16 to 23 million years old. About 2 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 Arrowhead Lake reaches Delaware Bay and the Atlantic Ocean by way of Mad Horse Creek and the Delaware: about 30 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Arrowhead Lake; river miles along the main stem, rounded.
Arrowhead Lake has a humid subtropical climate. Summer afternoons average 86° in July; winter nights fall to about 24° in January. About 43 inches of rain fall in a normal year.
On November 14 Arrowhead Lake normally reaches 57° and falls to 35°. The record high is 74°, in 1993; the record low 18°, in 1986. The most rain on this date, 2.31 in, fell in 1972.
Normals 1991–2020 and records since 1943 at Millville Municipal Airport, 15 miles east-southeast. NOAA, through RCC-ACIS.
