Hail Santa Rosa, CA
For 2026, Santa Rosa has recorded no hail reports. The average number of hail reports for the area, based on the 2005 through 2025 record, is 1.0 per year. Hail report counts come from National Weather Service Local Storm Reports filed by trained spotters. Those reports cover a 25 miles radius around the city, and the count is a sum of all reports within that radius.
as of
Every figure on this page covers a 25 mile circle centered on Santa Rosa. Between 2005 and 2025, the area averaged about 1.0 hail reports a year, coming on about 0.6 days. The largest hailstone since 1996 was 0.75 inches, on Dec 9, 2003.
Largest hailstones within 25 miles of Santa Rosa
| Diameter | Size | Place | Date |
|---|---|---|---|
| 0.75 inches | Penny | Guerneville, Sonoma County | Dec 9, 2003 |
| 0.75 inches | Penny | Yountville, Napa County | Jun 8, 2004 |
| 0.50 inches | Marble | Napa, Napa County | Sep 26, 2014 |
| 0.25 inches | Pea | Mark West, Sonoma County | Mar 5, 2017 |
| 0.25 inches | Pea | Calistoga, Napa County | Jun 11, 2017 |
Record figures come from the Storm Events Database at NCEI, a reviewed log that trails live reports by 2 to 3 months. Records start in 1996 and averages cover 2005-2025.
Hailstone sizes recorded near Santa Rosa
| Stone size | Reports | Share |
|---|---|---|
| Under 1 inch | 21 | 100% |
| 1 to under 2 inches | 0 | 0% |
| 2 inches and larger | 0 | 0% |
The NCEI Storm Events Database supplies the 21 reports within 25 miles of Santa Rosa from 2005 to 2025, with stone size recorded by diameter.
Hail reports by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reports | 0.3 | 0.2 | 0.3 | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
National Weather Service offices file Local Storm Reports; the Iowa Environmental Mesonet of Iowa State University relays them to this page, where they appear as live spotter reports. Under 17 U.S.C. 105, no copyright attaches to the government-produced figures on this page, including reports, alerts, station observations, and normals, which were created by the National Weather Service and other NOAA offices. The notice that 17 U.S.C. 403 requires appears in this sentence. It does not imply endorsement by or affiliation with those agencies. See: Data sources and attribution.