Address reportCitiesCalifornia › San Jose

San Jose, CA

Earthquake hazard, typical weather and growing season from public federal data. Population 998,537.

Flood zone: it depends on the exact parcel

There is no such thing as a flood zone for a whole city. Two houses on the same street can sit in different zones, and it is the single fact here that changes most over a short distance. So this page does not guess one.

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Earthquake hazard very-high

Design category D

Very high seismic hazard — at or near a major active fault. Very strong ground shaking is likely and the most stringent seismic-design provisions apply. A site-specific ground-motion study is typically required. The ASCE 7 Seismic Design Category here is D. (Short-period design value Ss ≈ 1.5 g — the standard headline measure of ground-shaking hazard.)

USGS Seismic Design Web Services (ASCE 7), assuming Site Class D — stiff or unknown soil. Real soil conditions can move the category either way.

Typical weather

82.7° in August, 42.8° in December

Thirty-year averages, not a forecast. Any individual year can differ substantially.

MonthHighLowRainSnow
Jan59°43.3°2.97"0"
Feb62.8°45.4°3.24"0"
Mar66.4°47.6°2.64"0"
Apr70°49.8°1.24"0"
May74.9°53.3°0.54"0"
Jun80.1°57°0.17"0"
Jul82.2°59.1°0.01"0"
Aug82.7°59.8°0.03"0"
Sep81.4°58.2°0.07"0"
Oct74.6°53.8°0.8"0"
Nov65°47.2°1.36"0"
Dec58.8°42.8°3.07"0"

NOAA/NCEI 1991–2020 U.S. Climate Normals — station SAN JOSE, CA US, 6.2 mi away.

Growing season zone 9b

362 frost-free days

Last spring frost around n/a, first fall frost around n/a. Roughly half of years see frost outside that window.

2023 USDA Plant Hardiness Zone Map and NOAA/NCEI 1991–2020 frost normals.

What this page does not tell you

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