The Lewiston 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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72° on Nov. 14, 1999, the hottest reading for this week of the year since 1948. Next is 70° in 2012.
Lewiston’s center stands about 1,220 ft above sea level. Within three miles the land runs from 1,040 ft to 1,240 ft, a difference of 200 ft: gently rolling country.
Under the town center the state geologic map shows Lower Ordovician (dolostone, sandstone), from the Early Ordovician, 471 to 487 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 28×. 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, sandstone. Age: Early Ordovician, 471 to 487 million years old. About 11 mi of the line.
Shale, limestone, sandstone. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 7 mi of the line.
Sandstone, siltstone, shale. Age: Cambrian, 487 to 497 million years old. About 3 mi of the line.
Sandstone, siltstone, shale. Age: Middle Cambrian to Cambrian, 487 to 521 million years old. About 2 mi of the line.
Limestone, dolostone. Age: Late Ordovician, 445 to 459 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 Lewiston reaches the Gulf of America by way of Rush Creek, the Root and the Mississippi: about 1,730 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lewiston; river miles along the main stem, rounded.
Lewiston has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 5° in January. About 37 inches of rain fall in a normal year.
On November 14 Lewiston normally reaches 45° and falls to 25°. The record high is 72°, in 1999; the record low 4°, in 1996. The most rain on this date, 0.32 in, fell in 2008.
Normals 1991–2020 and records since 1948 at Rushford, 14 miles south-southeast, 450 ft lower. NOAA, through RCC-ACIS.
