National Weather ServiceCaliforniaFreezing Fog AdvisoryArchive to October 1, 2026
Freezing Fog Advisories in California
The National Weather Service issued 0 freezing fog advisories for California in 2025 and 3 a year on average in 2008-2025; in 2021-2025 it had the 8th most of any state. 2026 through September: 7, 404% above the average of 1 for those months in 2008-2025. Lassen-Eastern Plumas-Eastern Sierra Counties was covered most often (33 times since 2008).
How many freezing fog advisories does California get?
Every freezing fog advisory that covered part of California. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 7 |
| 2025 | 0 |
| 2024 | 12 |
| 2023 | 1 |
| 2022 | 5 |
| 2021 | 3 |
| 2020 | 7 |
| 2019 | 4 |
| 2018 | 3 |
| 2017 | 2 |
| 2016 | 1 |
| 2015 | 0 |
| 2014 | 3 |
| 2013 | 7 |
| 2012 | 1 |
| 2011 | 2 |
| 2010 | 6 |
| 2009 | 4 |
| 2008 | 1 |
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
When in the year does California get them?
Sum of 2008-2025; the busiest month is labelled.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
Where in California?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Lassen-Eastern Plumas-Eastern Sierra Counties | 33 | 11 | December 7, 2024 |
| Western Siskiyou County | 12 | 7 | February 20, 2026 |
| Northeast Siskiyou and Northwest Modoc Counties | 11 | 3 | January 9, 2026 |
| Modoc County | 8 | 2 | January 9, 2026 |
| Central Siskiyou County | 7 | 1 | January 9, 2026 |
| Greater Lake Tahoe Area | 7 | 0 | January 30, 2021 |
| Tehachapi Area | 5 | 0 | January 8, 2020 |
| Mono | 3 | 0 | January 30, 2021 |
| Surprise Valley California | 3 | 0 | January 30, 2021 |
| Burney Basin / Eastern Shasta County | 2 | 0 | December 25, 2010 |
| East-Central San Joaquin Valley | 1 | 0 | December 22, 2017 |
| North Central and Southeast Siskiyou County | 1 | 0 | December 15, 2013 |
The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
What is a freezing fog advisory?
A freezing fog advisory means fog will freeze on roads, bridges and other surfaces, making them slippery while it cuts visibility. An advisory is issued for a hazard less serious than a warning that can still cause inconvenience or danger if people are not careful. The national record · Every warning type in California.