StormProof → hail seasons → St. Louis → 2021
St. Louis hail season 2021
9 NWS-recorded hail reports ≥1″ within 35 miles, across 6 storm days, max 2.00". Every one of those reports is a dated, located, citable official record — the context behind this market's 2021 claim volume.
Biggest storm days (2021, final record)
| Date | ≥1″ reports | Max hail | Areas named in the record |
|---|---|---|---|
| March 27, 2021 | 3 | 1.75" | MADISON, ST. LOUIS, ST. CHARLES |
| July 9, 2021 | 2 | 2.00" | ST. LOUIS, ST. CHARLES |
| December 10, 2021 | 1 | 1.00" | ST. LOUIS |
| June 19, 2021 | 1 | 1.00" | ST. CHARLES |
| May 27, 2021 | 1 | 1.00" | MONROE |
“A wide swath of large hail fell across the southern portions of St. Charles County. The National Weather Service reported golf ball sized hail at the office in Weldon Springs.”
— NWS event narrative, March 27, 2021 (NCEI Storm Events)
When it fell
Mar 3 · May 2 · Jun 1 · Jul 2 · Dec 1
Wind context: the record also holds 61 thunderstorm-wind events ≥50 kt (≈58 mph, the NWS severe criterion) in this radius for 2021 — relevant where the dispute is wind vs hail causation.
Working a St. Louis claim from 2021?
These are aggregates. A claim file needs the per-address record: every recorded event within 1, 3 and 10 miles of the property, distances, official narratives, and citations an adjuster can check line by line. That's the report — generated in seconds, hosted on HailEvidence (the neutral evidence surface), formatted as an insurance-appeal attachment.
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Provenance
Final counts: NCEI Storm Events Database, file vintage c20260527, hail events with recorded magnitude ≥1.00″ and point coordinates within 35 miles of the St. Louis anchor. NWS records are point and path observations. The absence of a nearby report does NOT prove that no hail fell at this address — it means no observation was logged nearby. A report of nearby hail documents the event; it does not by itself prove damage to a specific structure. Spotted an error? Email the address on our terms page and we correct against the source.