Sebastopol, California hail history
20
Days with hail on record
10
Carried by two or more independent sources
20
Measured by a person or an instrument
0.50in
Largest measured, Jan 2010
What was searched
| Evidence | Sources | Record from | Reports within 10 mi |
|---|---|---|---|
| Ground observation | ×6 | 1996 | 47 |
| Radar detection | ×1 | When an address is run | None |
| Official NWS warning | ×1 | When an address is run | None |
| Federal declaration | ×1 | When an address is run | None |
Hail days by year in Sebastopol, CA
Measured Detected only 1.00″ or more
Each mark is one day with hail on record, placed where it fell in the year, and each opens the record for that day. A row with nothing on it is a year with nothing on record.
Best-attested hail storms near Sebastopol
Most sources first
| Date | Largest | Measured | Reports | Sources |
|---|---|---|---|---|
| 17 Aug 2020 | 0.25″ | 0.25″ | 3 | ×3 |
| 25 Mar 2020 | 0.25″ | 0.25″ | 3 | ×3 |
| 15 Feb 2019 | 0.25″ | 0.25″ | 3 | ×3 |
| 26 Feb 2018 | 0.25″ | 0.25″ | 3 | ×3 |
| 22 Feb 2018 | 0.25″ | 0.25″ | 3 | ×3 |
| 25 Jan 2018 | 0.25″ | 0.25″ | 3 | ×3 |
| 19 Jan 2018 | 0.25″ | 0.25″ | 3 | ×3 |
| 11 Jun 2017 | 0.25″ | 0.25″ | 6 | ×3 |
Sources per hail day near Sebastopol
- One source
- 10
- Two
- 1
- Three or more
- 9
A day carried by one report is a report. A day that radar, an observer on the ground and a warning all describe is a storm, and it is the kind of day a file can rest on. Every report on these days keeps its own source.
- Wind days
- 44
- Tornado days
- 3
On record within the same 10 miles. Wind history for Sebastopol. A report for an address searches every family.
Largest hail recorded near Sebastopol, CA
Measured Detected, not measured
| Date | Size | Evidence | From centre |
|---|---|---|---|
| 19 Jan 2010 | 0.50″ | Ground observation | 3.1 mi SW |
| 10 May 2022 | 0.50″ | Ground observation | 7.3 mi ENE |
| 10 May 2022 | 0.50″ | Ground observation | 8.0 mi ENE |
| 05 Apr 2024 | 0.50″ | Ground observation | 6.0 mi ENE |
| 12 Feb 2007 | 0.25″ | Ground observation | 5.9 mi NE |
| 15 Dec 2008 | 0.25″ | Ground observation | 8.4 mi SE |
| 13 Apr 2012 | 0.25″ | Ground observation | 7.7 mi ESE |
| 13 Apr 2012 | 0.25″ | Ground observation | 7.7 mi ENE |
A roof has an age. The record has its days: roof age and hail exposure counts every hail day on record near an address since the year the roof went on.
Get the hail report for an address in Sebastopol, CA
Everything above is the record around Sebastopol: enough to know there is something to cite, and from where. None of it says what reached one roof.
Run the address and the same archive is searched at the property: the storm, the date, the measured size, the distance and bearing from the roof, and the federal record each figure came from, in a document that states its own method. Ready in minutes.
Questions about hail in Sebastopol, CA
How many hail days has Sebastopol, CA had on record?
20 days with hail within 10 miles of the centre of Sebastopol since 1996, 10 of them carried by two or more independent sources and 20 with hail measured by a person or an instrument.
When did it last hail in Sebastopol, CA?
The most recent hail on record near Sebastopol fell on 17 February 2026; no size was stated.
What is the largest hail measured near Sebastopol?
0.50 inches, measured on 19 January 2010, 3.1 miles SW of the centre of Sebastopol.
How do I get a hail report for an address in Sebastopol?
Enter the address on this page. The Titan Weather report is the paid document: it searches the same archive at the property and lists every hail report with its date, measured size, distance and bearing from the roof, and the federal source it came from. The calendar above this door is the same record for Sebastopol, free, without an address.
Hail history near Sebastopol
Within 30 miles of Sebastopol, nearest first. A storm that crossed one of these crossed the others, and their counts overlap.
- Santa Rosa 7 mi 16 days
- Rohnert Park 8 mi 18 days
- Cotati 8 mi 18 days
- Windsor 10 mi 16 days
- Petaluma 15 mi 9 days
- Healdsburg 16 mi 5 days
- Calistoga 18 mi 4 days
- St. Helena 21 mi 3 days
How this page is made
- What counted
- Every hail report in the archive with a point within 10 miles of the Census centre of Sebastopol (38.4000, -122.8276). A hail day is a calendar date with at least one report: four sources describing one storm are one afternoon of hail, not four.
- Measured and detected
- A report from a person or an instrument is measured. A radar-derived size is a detection and is marked as one, here and in every document we issue. The two are never added together.
- Severe
- A day counts as severe when its largest report reached 1.00″, the National Weather Service criterion. Smaller hail is still on the record, and still on this page.
- What this is not
- Neighbouring places share reports, so counts are not exclusive. This page is the record around a place; it is not a report on any property, and it states no opinion about one.
- Terms used on this page
- Storm day, independent source, measured and detected: each term this page uses is defined in the glossary as the report prints it.
- Alerts
- The next storm day to enter the record near Sebastopol can be sent to your inbox, with the figures its page states and nothing about any roof.
- The record
- Searched from 1996 to today. Compiled 28 August 2026 and rebuilt daily as the archive deepens. Records are reproduced as the federal sources published them. The coverage page states what the record holds, by kind and by year.
About this record
Everything here is reproduced from public federal and volunteer weather records, as the agencies and observer networks that publish them released it. Titan Weather compiles the record; it does not observe the weather, and it is not affiliated with any source it cites.
No archive holds everything. Storms cross places where nobody is standing, instruments and observers cover some areas better than others, sources revise their records, and recent reports can take weeks to arrive and settle. Coverage also thins as the years go back: an early quiet stretch may describe who was watching rather than what the weather did. Where this page shows nothing, nothing was found in the sources searched, within the period and area it states. That is not a finding that no weather occurred.
A record sits where its source filed it. Reports made from the ground are commonly logged against a town, a landmark or an offset from one rather than the spot where the measurement was taken, so any distance shown for one carries that source's own location error. Radar detections and warning geometry are instrument-located and do not.
These pages describe the public record near a place or on a date. They do not establish what reached any particular property, and nothing here is insurance, legal or engineering advice.