California Storm Data: Hail, Wind & Severe Weather

Deduplicated severe weather activity for California, fused from NWS warnings, storm reports, official records, and FEMA declarations.

California severe weather data — state map card, hail and wind history for the last 12 months

California severe weather at a glance (last 12 months)

StormAuditor's consolidated public record currently shows 3,902 storm events impacting 58 of California's 58 counties in the trailing 12 months: 2,209 wind events, 341 hail events, 29 tornado events, 1,518 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 California storm days

December 24, 2025 — 506 recorded events (flood, hail, tornado, wind)
December 25, 2025 — 222 recorded events (flood, hail, tornado, wind)
February 16, 2026 — 128 recorded events (flood, hail, wind)
January 3, 2026 — 126 recorded events (flood, hail, tornado, wind)
November 15, 2025 — 126 recorded events (flood, wind)

Most impacted counties

Los Angeles — 459 events (218 severe)
Mono — 316 events (212 severe)
San Bernardino — 270 events (150 severe)
Kern — 242 events (98 severe)
Humboldt — 144 events (27 severe)
Ventura — 132 events (79 severe)
Alameda — 120 events (27 severe)
Monterey — 114 events (53 severe)

Additional activity recorded in NWS forecast zones: San Gabriel Mountains And Highway 14 Corridor (8) · Santa Ynez Mountains Western Range (8) · Interstate 5 Corridor (8) · Santa Barbara County Southwestern Coast (8).

Download the California dataset (free)

The full consolidated California 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 California 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 California hail map and wind map, or check the county impact heatmap.

Neighboring states: Arizona storm data · Nevada storm data · Oregon 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.