The Umatilla 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 sunny
Sunny; warmer
Partly cloudy
Partly cloudy
Mostly sunny
Mostly sunny
Partly cloudy
88° on Nov. 12, 2015, the hottest reading for this week of the year since 1958. Next is 87° in 2002.
Umatilla’s center stands about 110 ft above sea level. Within three miles the land runs from 50 ft to 170 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Cypresshead Formation (sand), from the Late Pliocene, 2.6 to 3.6 million years old.
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 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.
Sand. Age: Late Pliocene, 2.6 to 3.6 million years old. About 17 mi of the line.
Sand, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 5 mi of the line.
Sand. Age: Holocene, less than 12,000 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.
Umatilla has a humid subtropical climate. Summer afternoons average 92° in August; winter nights fall to about 49° in January. About 44 inches of rain fall in a normal year.
On November 14 Umatilla normally reaches 77° and falls to 57°. The record high is 87°, in 2018; the record low 33°, in 1963. The most rain on this date, 2.20 in, fell in 1972.
Normals 1991–2020 and records since 1958 from the Leesburg Area threaded record (Leesburg Municipal Airport, 11 miles southwest). NOAA, through RCC-ACIS.
