Montana Storm Data: Hail, Wind & Severe Weather
Deduplicated severe weather activity for Montana, fused from NWS warnings, storm reports, official records, and FEMA declarations.
Montana severe weather at a glance (last 12 months)
StormAuditor's consolidated public record currently shows 9,830 storm events impacting 56 of Montana's 56 counties in the trailing 12 months: 8,985 wind events, 1,352 hail events, 117 flood events. Events are fused from National Weather Service warnings and Special Weather Statements, observed Local Storm Reports, official NCEI storm records, and FEMA disaster declarations, then consolidated into a single event table under the published methodology. Because a single storm can carry more than one hazard tag (a squall line can produce both wind and flood records), the per-type counts can legitimately add up to more than the consolidated total. Sub-severe statements (radar-indicated gusts of 40+ mph or hail of 0.5"+) are included at a distinct moderate tier and never counted as severe.
Biggest Montana storm days
- December 17, 2025 — 899 recorded events (wind)
- March 12, 2026 — 598 recorded events (wind)
- March 8, 2026 — 480 recorded events (wind)
- May 13, 2026 — 331 recorded events (hail, wind)
- September 2, 2026 — 279 recorded events (hail, wind)
Most impacted counties
- Glacier — 709 events (596 severe)
- Park — 641 events (326 severe)
- Teton — 450 events (379 severe)
- Fergus — 388 events (308 severe)
- Sweet Grass — 367 events (193 severe)
- Liberty — 324 events (280 severe)
- Cascade — 324 events (226 severe)
- Lewis and Clark — 287 events (197 severe)
Additional activity recorded in NWS forecast zones: High Plains (68) · Toole And Liberty (38) · Rocky Mountain Front (33) · Bears Paw Mountains And Southern Blaine (30).
Download the Montana dataset (free)
The full consolidated Montana event list for the trailing 12 months — dates, counties, hazard types, severities, measured gusts and hail sizes, with coordinates; source records deduplicated, and each NWS warning product listed per affected county — downloads free and stays current with the live record: download CSV · download JSON. Reusable with attribution under the data license; the JSON file carries a field dictionary and provenance notes.
Research a specific Montana address
Statewide counts tell you where activity concentrated; they do not tell you what happened at one property. For an individual address, run the Free Report Snapshot (an instant YES/NO against StormAuditor's screening thresholds — wind ≥ 45 mph, hail ≥ 0.75 in., deliberately below the official NWS severe criteria), use the Address Lookup, or purchase a full Weather Report for $2.99 covering every qualifying storm date at the address. Browse day-by-day activity on the Storm Calendar or compare states on the Storm Data hub.
All values are derived from public NOAA and NWS data under StormAuditor's published methodology. They are research estimates, not certified weather records — see Limitations. Data last refreshed September 6, 2026.
See where recent storms tracked on the statewide Montana hail map and wind map, or check the county impact heatmap.
Montana city storm pages: Billings hail & wind history · Missoula hail & wind history · Great Falls hail & wind history
Neighboring states: Idaho storm data · North Dakota storm data · South Dakota storm data · Wyoming storm data
About this page: built by Storm Auditor LLC from public NOAA/NWS records — deduplicated warnings, storm reports, station measurements, and official records on a rolling 12-month window, under the published methodology. See the StormAuditor Editorial Team for how content is produced.