The Chatham 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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70° on Nov. 12, 2022, the hottest reading for this week of the year since 1996. Next is 66° in 2005.
Chatham’s center stands barely above sea level. Within three miles the land runs from 0 ft to 50 ft, a difference of 50 ft: nearly flat ground. Open water lies within three miles. The highest named summit within 15 miles is Black Ball Hill, about 160 ft, 13 miles northwest.
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.
Granite, gneiss, schist. Age: Neoproterozoic, 542 to 1,000 million years old. About 8 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.
Chatham has a oceanic climate. Summer afternoons average 79° in July; winter nights fall to about 26° in January. About 45 inches of rain fall in a normal year.
On November 14 Chatham normally reaches 52° and falls to 39°. The record high is 66°, in 2005; the record low 21°, in 2019. The most rain on this date, 0.98 in, fell in 2000.
Normals 1991–2020 and records since 1996 at Chatham Municipal Airport, 5 miles north. NOAA, through RCC-ACIS.
