Frost Advisories in California
1,662 frost advisories since 1986. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of frost advisories reaches back to 2005.
Frost Advisories by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Frost Advisories
- 1,662
- Busiest year
- 2013117 frost advisories
- Average year
- 76over 22 years on file
Over time
By year
Before late 2005 the archive holds only tornado, severe thunderstorm, flash flood and marine warnings, and from 1997 SPC's watches, so the jump that year is the archive widening, not the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Mendocino County333
- Humboldt County262
- Siskiyou County197
- Del Norte County154
- San Bernardino County151
- Monterey County143
- Marin County131
- Sonoma County131
- Riverside County129
- San Diego County120
- Los Angeles County114
- Trinity County110
- Modoc County108
- Napa County105
- Lake County101
- San Benito County94
- Santa Clara County91
- Santa Barbara County90
- Alameda County89
- Contra Costa County89
- San Mateo County62
- Ventura County61
- Santa Cruz County52
- San Luis Obispo County40
- Orange County8
- City and County of San Francisco6
The latest frost advisories
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 11:06 AM PDT | Frost Advisory | MFR | Modoc | 22 hr |
| Sep 3, 12:39 PM PDT | Frost Advisory | EKA | Lake, Mendocino, Trinity | 17 hr |
| Aug 31, 12:19 PM PDT | Frost Advisory | MFR | Modoc | 40 hr |
| Jun 10, 6:16 AM PDT | Frost Advisory | MFR | Modoc, Siskiyou | 25 hr |
| Jun 8, 10:10 PM PDT | Frost Advisory | MFR | Modoc, Siskiyou | 34 hr |
| Jun 5, 9:26 PM PDT | Frost Advisory | MFR | Modoc, Siskiyou | 36 hr |
| Jun 2, 8:08 PM PDT | Frost Advisory | MFR | Modoc, Siskiyou | 36 hr |
| May 18, 1:46 AM PDT | Frost Advisory | EKA | Humboldt, Trinity | 6 hr |
| Apr 26, 12:26 PM PDT | Frost Advisory | EKA | Humboldt, Trinity | 21 hr |
| Apr 22, 12:12 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Lake, Mendocino | 20 hr |
| Apr 17, 11:09 AM PDT | Frost Advisory | EKA | Humboldt, Lake, Mendocino | 21 hr |
| Apr 16, 12:49 PM PDT | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 20 hr |
Nearby
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Warning verification from the Mesonet's Cow. Rebuilt daily.