The Cosmopolis 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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5.19 inches of rain fell in two days, the most for this week of the year since records began in 1953. The next wettest, 4.50 inches, fell in 1954.
Cosmopolis’s center stands about 20 ft above sea level. Within three miles the land runs from 0 ft to 560 ft, a difference of 560 ft: hilly country. The highest named summit within 15 miles is Scar Hill, about 930 ft, 8 miles south-southeast.
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 31×. 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 9 mi of the line.
Sandstone, siltstone. Age: Miocene, 5.3 to 23 million years old. About 5 mi of the line.
Gravel, sand. Age: Pleistocene, less than 2.6 million years old. About 1 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 Cosmopolis reaches the Pacific Ocean by way of the Chehalis: about 4 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Cosmopolis; river miles along the main stem, rounded.
Cosmopolis has a warm-summer Mediterranean climate. Summer afternoons average 68° in August; winter nights fall to about 37° in December. About 69 inches of rain fall in a normal year.
On November 14 Cosmopolis normally reaches 52° and falls to 40°. The record high is 65°, in 1995; the record low 13°, in 1955. The most rain on this date, 1.83 in, fell in 2001.
Normals 1991–2020 and records since 1953 at Hoquiam Bowerman Airport, 8 miles west. NOAA, through RCC-ACIS.
