Address reportCitiesTexas › Harlingen

Harlingen, TX

Earthquake hazard, typical weather and growing season from public federal data. Population 65,665.

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 ≈ 0.042 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

97.8° in August, 51.1° in January

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

MonthHighLowRainSnow
Jan71.7°51.1°1.22"0"
Feb76°54.8°1.19"0"
Mar81°60°1.49"0"
Apr86.4°65.9°2.29"0"
May91.1°71.8°2.73"0"
Jun95.4°75.9°2.37"0"
Jul96.6°76.9°2.44"0"
Aug97.8°76.8°2.07"0"
Sep93.1°73.6°5.76"0"
Oct88°66.8°3.06"0"
Nov79.7°58.8°2"0"
Dec73.2°52.5°1.58"0.1"

NOAA/NCEI 1991–2020 U.S. Climate Normals — station HARLINGEN, TX US, 3.7 mi away.

Growing season zone 10a

357 frost-free days

Last spring frost around January 8, first fall frost around December 29. 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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