The St. Johns 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.
Mostly cloudy
Mostly cloudy
Partly cloudy
Sunny
Mostly sunny
Partly cloudy
Mostly sunny
77° on Nov. 11, 2020, the hottest reading for this week of the year since 1901. Next is 73° in 1958.
St. Johns’s center stands about 1,010 ft above sea level. Within three miles the land runs from 920 ft to 1,080 ft, a difference of 160 ft: gently rolling country.
Under the town center the state geologic map shows Tymochtee and Greenfield Formations, Undivided (dolostone), from the Silurian, 428 to 445 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.
Dolostone. Age: Silurian, 428 to 445 million years old. About 16 mi of the line.
Dolostone. Age: Silurian, 425 to 445 million years old. About 7 mi of the line.
Dolostone. Age: Silurian, 422 to 445 million years old. About 0.8 mi of the line.
Dolostone, limestone, shale. Age: Silurian, 422 to 445 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.
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 St. Johns reaches Lake Erie by way of Blackhoof Creek, the Auglaize and the Maumee: about 160 river miles. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
90 miles of the trip are on the Auglaize.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of St. Johns; river miles along the main stem, rounded.
St. Johns has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 19° in January. A normal year brings about 18 inches of snow; with the rain, that comes to about 41 inches of water.
On November 14 St. Johns normally reaches 51° and falls to 34°. The record high is 72°, in 1909; the record low 9°, in 2019. The most rain on this date, 2.10 in, fell in 1993.
Normals 1991–2020 and records since 1901 at Lima Wwtp, 12 miles north-northwest, 160 ft lower. NOAA, through RCC-ACIS.
