Janesville, WI Hail & Wind Storm History
Severe weather within ~25 miles of Janesville, Wisconsin or recorded for its county over the last 12 months — NWS warnings, observed storm reports, and official records, consolidated.
Janesville, Wisconsin storm history at a glance (last 12 months)
This free weather history for Janesville — home to roughly 66,428 residents in Rock County — draws on StormAuditor's consolidated public record: 143 wind and hail events within 25 miles of Janesville or recorded for Rock County in the trailing 12 months — 79 wind events and 64 hail events, including a maximum observed wind gust of 58 mph and observed hail up to 2″. Rock County as a whole recorded 131 events (69 wind · 62 hail). Events fuse NWS warnings, observed Local Storm Reports, station measurements, and official NCEI records, consolidated into a single event table.
Biggest storm days near Janesville
- April 17, 2026 — 38 recorded events · 21 wind · 17 hail
- April 2, 2026 — 22 recorded events · 8 wind · 14 hail
- June 24, 2026 — 13 recorded events · 7 wind · 6 hail
- June 10, 2026 — 12 recorded events · 9 wind · 3 hail
- June 17, 2026 — 10 recorded events · 6 wind · 4 hail
Janesville hail map and wind map
Researching hail in Janesville or severe wind in Janesville? Radar-derived hail swaths and peak-gust wind swaths for Wisconsin — including the Janesville metro — are on the Hail Explorer and Wind Explorer: pick any storm date and see how estimated hail size and wind gust bands tracked through Rock County. County-level activity is on the impact heatmap, and day-by-day history is on the Storm Calendar.
Free Janesville weather report by address
Area maps show where storms tracked; an insurance claim or roof inspection needs what happened at the property. Start with a free weather report check: the Free Report Snapshot answers YES/NO instantly on estimated damaging wind (45+ mph) and damage-capable hail (0.75 in. or larger) at any Janesville address, and the Address Lookup adds free Janesville wind history and free Janesville hail history context — NWS warnings, storm reports, and NOAA observations — at no charge. When you need the full document, a complete Weather Report is $2.99 and covers every qualifying storm date at one address. All values are estimates from public NOAA data under our published methodology — research documentation, not certified weather records (see Limitations).
Free Janesville storm data download
The Janesville dataset on this page — every wind and hail event within about 25 miles of Janesville or recorded for Rock County from the last 12 months, consolidated so the same source record is never counted twice (a storm that triggered several NWS warning products shows each product), with dates, counties, event types, measured gusts, and hail sizes — downloads free, reusable with attribution under the data license: download CSV · download JSON. Because the radius can cross county and state lines while county records can extend beyond it, these counts can legitimately differ from the Rock County-only totals above. Statewide files are on the Wisconsin storm data page.
More Wisconsin city storm pages: Milwaukee hail & wind history · Madison hail & wind history · Green Bay hail & wind history · Appleton hail & wind history · Waukesha hail & wind history · Eau Claire hail & wind history · Mount Pleasant hail & wind history · Kenosha hail & wind history · Wisconsin statewide 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.
Data last refreshed September 19, 2026. Counts cover severe and sub-severe wind and hail; flood activity and Special Weather Statements are tracked separately on the dashboard.