The Anacortes 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. 13, 2013, the hottest reading for this week of the year since 1945. Next is 65° in 1990.
Anacortes’s center stands about 18 ft above sea level. Within three miles the land runs from 0 ft to 750 ft, a difference of 750 ft: hilly country. Open water lies within three miles. The highest named summit within 15 miles is Chuckanut Mountain, about 2,330 ft, 12 miles northeast.
Under the town center the state geologic map shows Upper Jurassic-Lower Cretaceous sedimentary and volcanic rocks (graywacke, argillite, siltstone), from the Jurassic to Late Cretaceous, 66 to 202 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 14×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Silt, sand. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Serpentinite. Age: Middle Jurassic to Late Jurassic, 145 to 175 million years old. About 3 mi of the line.
Sand, gravel. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
Greenstone, schist, volcanic. Age: Middle Jurassic to Eocene, 34 to 175 million years old. About 0.5 mi of the line.
Limestone. Age: Permian to Triassic, 202 to 299 million years old. About 0.3 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.
Rain that falls on Anacortes runs straight into the Pacific Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Anacortes; river miles along the main stem, rounded.
Anacortes has a warm-summer Mediterranean climate. Summer afternoons average 70° in August; winter nights fall to about 37° in February. A normal year brings about 5 inches of snow; with the rain, that comes to about 20 inches of water.
On November 14 Anacortes normally reaches 54° and falls to 41°. The record high is 66°, in 2013; the record low 11°, in 1955. The most rain on this date, 0.70 in, fell in 2015.
Normals 1991–2020 and records since 1945 at Whidbey Island Nas, 11 miles south-southwest. NOAA, through RCC-ACIS.
