The Martinez 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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Mostly sunny; warmer
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28° on Nov. 11, 2025, the coldest reading for this week of the year since 1996. Next is 29° in 1997.
Martinez’s center stands about 360 ft above sea level. Within three miles the land runs from 180 ft to 470 ft, a difference of 290 ft: rolling country.
Under the town center the state geologic map shows Lower Tertiary-Cretaceous undifferentiated (sand, clay), from the Cretaceous to Tertiary, 2.6 to 145 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 44×. 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, clay. Age: Cretaceous to Tertiary, 2.6 to 145 million years old. About 11 mi of the line.
Paragneiss. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 6 mi of the line.
Gneiss. Age: Precambrian to Paleozoic. About 5 mi of the line.
Argillite, phyllite. Age: Precambrian to Paleozoic. About 2 mi of the line.
Granite. Age: Precambrian to Paleozoic. 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 Martinez reaches the Atlantic Ocean by way of Reed Creek and the Savannah: about 210 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Martinez; river miles along the main stem, rounded.
Martinez has a humid subtropical climate. Summer afternoons average 94° in July; winter nights fall to about 40° in January. About 45 inches of rain fall in a normal year.
On November 14 Martinez normally reaches 68° and falls to 48°. The record high is 81°, in 2007; the record low 32°, in 2013. The most rain on this date, 3.76 in, fell in 2008.
Normals 1991–2020 and records since 1996 at Augusta Daniel Field Airport, 4 miles south-southeast. NOAA, through RCC-ACIS.
