Address reportCitiesFlorida › St. Petersburg

St. Petersburg, FL

Earthquake hazard, typical weather and growing season from public federal data. Population 249,688.

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-low

Design category A

Very low seismic hazard. Damaging earthquakes are rare at this location and design ground motions are minimal. Ordinary buildings carry essentially no special seismic-detailing requirement. The ASCE 7 Seismic Design Category here is A. (Short-period design value Ss ≈ 0.051 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

90.9° in July, 54.3° in January

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

MonthHighLowRainSnow
Jan69.8°54.3°2.97"0"
Feb72.7°56.6°2.17"0"
Mar76.5°60.9°2.86"0"
Apr81.6°66.3°2.6"0"
May86.7°71.9°2.54"0"
Jun89.8°75.9°7.18"0"
Jul90.9°76.9°8.35"0"
Aug90.8°77.1°9.33"0"
Sep89.1°75.7°7.51"0"
Oct84.3°70°2.52"0"
Nov77.2°62.7°1.61"0"
Dec72.2°57.6°2.84"0"

NOAA/NCEI 1991–2020 U.S. Climate Normals — station ST PETERSBURG, FL US, 0.7 mi away.

Growing season zone 10b

365 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.

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