Address reportCitiesIndiana › Indianapolis

Indianapolis, IN

Earthquake hazard, typical weather and growing season from public federal data. Population 843,393.

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 moderate

Design category C

Moderate seismic hazard. Occasional moderate earthquakes are credible over a building's life; new construction requires moderate seismic-resistant design and detailing. The ASCE 7 Seismic Design Category here is C. (Short-period design value Ss ≈ 0.186 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

84.8° in July, 19.8° in January

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

MonthHighLowRainSnow
Jan35.7°19.8°3.32"8.4"
Feb40.6°22.7°2.66"7.2"
Mar51.3°32.1°3.86"3.6"
Apr64.3°42°4.61"0.2"
May73.8°52.1°4.94"0"
Jun81.9°61.7°5.56"0"
Jul84.8°65.1°4.67"0"
Aug82.9°63.3°3.89"0"
Sep76.7°55.9°3.56"0"
Oct64.6°44.5°3.43"0"
Nov51.5°33.7°3.51"0.6"
Dec39.9°25.2°3.17"6.7"

NOAA/NCEI 1991–2020 U.S. Climate Normals — station CASTLETON 2 S, IN US, 8 mi away.

Growing season zone 6b

183 frost-free days

Last spring frost around April 20, first fall frost around October 21. 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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