Hail events in Sonoma County, California The hail events on record, by date and by year
This page is a county record of past events and claims. It does not show the flood zone or the risk of an address. For the flood map of an address, use FEMA's address search (opens in a new tab).
NCEI has 21 hail events on record for Sonoma County, California, from 1955 through 30 Jun 2026.
The newest hail event on record is on 10 Mar 2021.
From 2016 through 2025, NCEI has 20 hail events on record for the county.
The NWS collects event reports from a variety of sources, which include (but are not limited to): county, state, and federal emergency management officials, local law enforcement officials, SKYWARN spotters, NWS damage surveys, newspaper clipping services, the insurance industry, and the general public, among others.
The National Weather Service reports property and crop damage estimates using available data at the time of event reporting. These values should therefore be considered broad estimates. Damage amounts are not adjusted for inflation.
The words of the agency. Source: NOAA NCEI, Storm Events Database, page "Frequently Asked Questions", copied on .
Date of the data: NCEI storm events through . Event types on this page: Hail.
Newest hail events on record
Hail0.25 in, pea size
At SANTA ROSA
Hail0.25 in, pea size
1 mile S of SANTA ROSA
Hail0.25 in, pea size
7 miles NNW of HEALDSBURG
Hail0.25 in, pea size
1 mile NNW of PETALUMA
Hail0.25 in, pea size
1 mile SE of COTATI
Hail0.25 in, pea size
1 mile N of CLOVERDALE
Hail0.25 in, pea size
At OCCIDENTAL
Hail0.25 in, pea size
1 mile NW of WINDSOR
Hail0.25 in, pea size
At PETALUMA
Hail0.25 in, pea size
At SANTA ROSA
Hail0.25 in, pea size
3 miles N of BODEGA
Hail0.25 in, pea size
1 mile E of PETALUMA
Hail0.25 in, pea size
5 miles WNW of PETALUMA
Hail0.25 in, pea size
2 miles WSW of OCCIDENTAL
Hail0.25 in, pea size
At SANTA ROSA
Hail0.25 in, pea size
1 mile N of PETALUMA
Hail0.25 in, pea size
1 mile WNW of PETALUMA
Hail0.25 in, pea size
2 miles N of SANTA ROSA
Hail0.25 in, pea size
1 mile N of COTATI
Hail0.25 in, pea size
At MARK WEST
Hail0.75 in, penny size
At GUERNEVILLE
A place is the text of the NCEI record: a distance and a direction from a reference place. The site does not show a place text that names a private property or reads as a person. Hail size is in inches, with the object that NCEI names for that size.
Hail events by year
| Decade | Year that ends in 0 | Year that ends in 1 | Year that ends in 2 | Year that ends in 3 | Year that ends in 4 | Year that ends in 5 | Year that ends in 6 | Year that ends in 7 | Year that ends in 8 | Year that ends in 9 | All |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1950s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1960s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1970s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1980s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1990s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2000s | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| 2010s | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 9 | 2 | 14 |
| 2020s | 5 | 1 | 0 | 0 | 0 | 0 | 0 (part of the year) | 6 |
A darker cell has a larger count. The number is in each cell.
Hail events are on record from 1955. The year 2026 has the events through 30 Jun 2026 only.
By month, all years
- Jan6 events
- Feb4 events
- Mar7 events
- Apr0 events
- May0 events
- Jun2 events
- Jul0 events
- Aug1 event
- Sep0 events
- Oct0 events
- Nov0 events
- Dec1 event
Magnitudes on record
| Hail size | Size in words | Events |
|---|---|---|
| under 1 in | pea to quarter | 21 |
| 1 to 1.74 in | quarter to golf ball | 0 |
| 1.75 to 2.74 in | golf ball to baseball | 0 |
| 2.75 to 3.99 in | baseball to softball | 0 |
| 4 in and larger | softball and larger | 0 |
When listing hail size under Magnitude, e.g., 2.25 in., the hail size is given in inches and hundredths of inches. These values are assigned a size in inches from their appearance.
An event without a size in the record is not in this table.
Beside the other counties
| Measure | Sonoma | All counties of California | All counties of the United States |
|---|---|---|---|
| Hail events, 1955 to 2026 | 21 | 934 | 423,723 |
| Events for each 100 square miles | 1.3 | 0.6 | 12.0 |
| Events for each 10,000 residents | 0.4 | 0.2 | 12.8 |
The columns for the state and the United States total the counties. They count the events of each county in the same way as the county column. A forecast zone with another name than a county counts for the state only.
Official channels
- NCEI Storm Events Database (opens in a new tab)Search the full NCEI record by state, county and date.
- National Weather Service: San Francisco Bay Area, CA (opens in a new tab)The forecast office that issues the weather warnings for the county.
- FEMA Flood Map Service Center: Search By Address (opens in a new tab)Search an address to see its flood map. This site has no flood-zone data.
These links open the pages of the agencies. The site checked the links on .
Cite this page
County Hazards. "Hail events on record for Sonoma County, California". https://countyhazards.com/county/ca/sonoma/hail/. Data: NOAA NCEI Storm Events Database through 30 Jun 2026. Page made on .
Questions
- Which month has the most hail events on record for Sonoma County?
- March has 7 of the 21 hail events on record from 1955 through 30 Jun 2026.
- How many hail events are on record for California?
- NCEI has 936 hail events on record for California from 1955 through 30 Jun 2026. That count has every forecast zone of the state.
- How does Sonoma County compare with the other counties of California?
- The counties of California have 0.6 hail events for each 100 square miles. Sonoma County has 1.3.
- How large is the hail on record for Sonoma County?
- No hail event has a size of 1.75 inches or more. NCEI names 1.75 inches a golf ball.