Radar-detected hail history for any US address. Free, keyless, CORS open.
Returns every day NOAA's NEXRAD Level-III Hail Detection Algorithm registered hail over the grid tile containing an address, with per-year counts. No API key, no registration, no signup.
Read this before you build on it. Answers describe a 0.1° grid tile — roughly 7 miles north-to-south — not a rooftop. A detection inside the tile does not prove hail fell on a specific structure, and no detection does not prove none fell. Radar resolution is finest near the radar and coarsens with distance. This is a screening tool, not an insurance claim, a loss report, or an engineering inspection.
GET https://whathitmyhouse.com/.netlify/functions/hail-historyGive it either an address or a lat/lon pair.
| Parameter | Notes |
|---|---|
address | US one-line address. Mutually exclusive with lat/lon. Needs a house number and street — a city name alone will not geocode. |
lat / lon | Decimal degrees. Use these to skip geocoding entirely. |
from | Start calendar year, inclusive. Clamped to the period of record. |
to | End calendar year, inclusive. Clamped to the current year. |
detail | none (default), top for the busiest days, or a specific date. |
topN | How many busiest days to expand when detail=top. |
curl "https://whathitmyhouse.com/.netlify/functions/hail-history?lat=35.4676&lon=-97.5164&from=2015&to=2020"Returns, for that tile near Oklahoma City:
"result": {
"coverage": "detections_found",
"yearsCovered": 6,
"fromYear": 2015,
"toYear": 2020,
"hailDays": 40,
"totalRadarDetections": 151,
"yearsWithHail": 6
}A location with no hail returns coverage: "no_detections" — a real answer, not an error.
searchArea | The exact tile bounds searched, so you can see what "near this address" meant. |
fetchStrategy | How many upstream NOAA requests were used, and why. |
source | Dataset attribution and the upstream service URL. |
retrievedAt | When the data was pulled. Nothing is cached behind your back. |
disclaimer | The tile-not-rooftop caveat, in the payload rather than buried in docs. |
Hail data comes live from the NOAA NCEI
Severe Weather Data Inventory, dataset nx3hail. Geocoding uses the US Census geocoder.
Both are US government open data and neither requires a key.
No rate limit is documented by the upstream source, which is not the same as there being none — be reasonable. Machine-readable spec: openapi.json.
← Hail history lookup · Flood zone, earthquake hazard, climate and growing season for the same address
What Hit My House · Fredericksburg, Virginia ·
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Independent. Not affiliated with, endorsed by, or sponsored by NOAA, the National Weather Service, or
any government agency. Built on public-domain federal data.
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