Alert archive / California / Frost Advisories

Frost Advisories in California, 2021

89 frost advisories in 2021. 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 in 2021. Tap one for its archive.

Frost Advisories: 89
Busiest month: March23 frost advisories
Busiest day: October 11, 20215 frost advisories

Over time

By month

The alerts

Every alert, in the order issued. Times are local, Pacific Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Counties	Lasted
Jan 23, 9:10 PM PST	Frost Advisory	LOX		12 hr
Jan 25, 2:29 PM PST	Frost Advisory	LOX	Los Angeles	19 hr
Jan 25, 11:32 PM PST	Frost Advisory	SGX	Orange, Riverside, San Bernardino, San Diego	9 hr
Feb 28, 3:10 PM PST	Frost Advisory	EKA	Mendocino	17 hr
Mar 1, 2:42 PM PST	Frost Advisory	EKA	Humboldt, Lake, Mendocino	18 hr
Mar 2, 2:37 PM PST	Frost Advisory	EKA	Del Norte, Humboldt, Lake, Mendocino	18 hr
Mar 4, 1:07 AM PST	Frost Advisory	EKA	Mendocino	7 hr
Mar 6, 3:32 AM PST	Frost Advisory	EKA	Mendocino	29 hr
Mar 7, 2:04 PM PST	Frost Advisory	EKA	Humboldt, Mendocino	17 hr
Mar 10, 2:31 PM PST	Frost Advisory	EKA	Humboldt, Mendocino	18 hr
Mar 11, 1:04 PM PST	Frost Advisory	EKA	Humboldt, Mendocino	20 hr
Mar 12, 1:43 PM PST	Frost Advisory	EKA	Mendocino	19 hr
Mar 13, 12:36 PM PST	Frost Advisory	EKA	Mendocino	18 hr
Mar 15, 2:30 AM PDT	Frost Advisory	MTR	Marin, Monterey, Napa, San Benito, Sonoma	31 hr
Mar 15, 1:01 PM PDT	Frost Advisory	SGX	Riverside, San Bernardino, San Diego	19 hr
Mar 15, 1:31 PM PDT	Frost Advisory	STO		20 hr
Mar 16, 1:27 PM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Mendocino	20 hr
Mar 19, 3:32 AM PDT	Frost Advisory	EKA	Lake, Mendocino	29 hr
Mar 20, 12:51 PM PDT	Frost Advisory	MTR	Marin, Monterey, Napa, Sonoma	20 hr
Mar 20, 2:30 PM PDT	Frost Advisory	EKA	Del Norte, Humboldt	18 hr
Mar 22, 3:28 AM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Mendocino	30 hr
Mar 23, 2:04 PM PDT	Frost Advisory	EKA	Humboldt, Mendocino	19 hr
Mar 24, 2:08 PM PDT	Frost Advisory	EKA	Lake, Mendocino	19 hr
Mar 25, 2:12 PM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Mendocino	19 hr
Mar 26, 2:32 PM PDT	Frost Advisory	EKA	Humboldt, Lake, Mendocino	18 hr
Mar 28, 2:29 PM PDT	Frost Advisory	EKA	Lake, Mendocino	19 hr
Mar 29, 2:24 PM PDT	Frost Advisory	EKA	Del Norte, Mendocino	19 hr
Apr 2, 2:36 PM PDT	Frost Advisory	EKA	Humboldt, Mendocino	18 hr
Apr 3, 2:05 PM PDT	Frost Advisory	EKA	Humboldt, Lake, Mendocino	19 hr
Apr 6, 3:27 AM PDT	Frost Advisory	EKA	Humboldt, Mendocino	6 hr
Apr 8, 1:51 PM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Lake, Mendocino	19 hr
Apr 9, 2:20 PM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Mendocino	19 hr
Apr 10, 2:07 PM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Mendocino	19 hr
Apr 11, 2:21 PM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Mendocino	19 hr
Apr 13, 2:46 PM PDT	Frost Advisory	EKA	Humboldt, Mendocino	18 hr
Apr 14, 2:50 PM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Lake, Mendocino, Trinity	18 hr
Apr 15, 2:02 PM PDT	Frost Advisory	EKA	Mendocino, Trinity	19 hr
Apr 25, 10:34 PM PDT	Frost Advisory	EKA	Lake, Mendocino, Trinity	10 hr
Apr 26, 1:55 AM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Lake, Mendocino, Trinity	30 hr
May 6, 3:11 AM PDT	Frost Advisory	EKA	Humboldt, Mendocino, Trinity	29 hr
May 7, 2:03 PM PDT	Frost Advisory	EKA	Humboldt, Mendocino, Trinity	19 hr
May 18, 3:43 AM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Lake, Mendocino, Trinity	29 hr
May 19, 2:35 PM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Lake, Mendocino, Trinity	18 hr
May 20, 2:09 PM PDT	Frost Advisory	EKA	Del Norte, Humboldt, Lake, Mendocino, Trinity	19 hr
May 21, 2:22 PM PDT	Frost Advisory	EKA	Humboldt, Lake, Mendocino, Trinity	19 hr
Jun 7, 2:06 PM PDT	Frost Advisory	EKA	Humboldt, Lake, Mendocino, Trinity	19 hr
Jun 8, 12:09 PM PDT	Frost Advisory	EKA	Mendocino	21 hr
Jun 9, 12:04 PM PDT	Frost Advisory	EKA	Humboldt, Mendocino	21 hr
Sep 27, 3:15 AM PDT	Frost Advisory	EKA	Lake, Mendocino, Trinity	30 hr
Sep 28, 3:43 AM PDT	Frost Advisory	MFR	Siskiyou	30 hr
Sep 28, 1:04 PM PDT	Frost Advisory	EKA	Humboldt, Mendocino, Trinity	20 hr
Oct 7, 1:25 PM PDT	Frost Advisory	EKA	Humboldt, Lake, Mendocino, Trinity	19 hr
Oct 10, 2:55 PM PDT	Frost Advisory	EKA	Humboldt, Trinity	13 hr
Oct 10, 8:54 PM PDT	Frost Advisory	MFR	Siskiyou	12 hr
Oct 11, 2:46 AM PDT	Frost Advisory	SGX	San Bernardino	9 hr
Oct 11, 3:45 AM PDT	Frost Advisory	MTR	Monterey	28 hr
Oct 11, 4:11 AM PDT	Frost Advisory	LOX		29 hr
Oct 11, 1:36 PM PDT	Frost Advisory	MFR	Siskiyou	19 hr
Oct 12, 2:41 AM PDT	Frost Advisory	MTR	Monterey	30 hr
Oct 12, 12:33 PM PDT	Frost Advisory	LOX		20 hr
Oct 12, 12:57 PM PDT	Frost Advisory	SGX	San Bernardino	20 hr
Oct 13, 2:15 PM PDT	Frost Advisory	EKA	Del Norte, Mendocino	19 hr
Oct 14, 2:05 PM PDT	Frost Advisory	EKA	Humboldt, Lake, Mendocino, Trinity	19 hr
Nov 6, 3:28 AM PDT	Frost Advisory	EKA	Humboldt, Lake, Mendocino	30 hr
Nov 7, 3:41 AM PST	Frost Advisory	EKA	Humboldt, Lake, Mendocino	28 hr
Nov 20, 2:32 AM PST	Frost Advisory	EKA	Del Norte, Humboldt, Lake, Mendocino	31 hr
Nov 21, 2:05 PM PST	Frost Advisory	EKA	Del Norte, Humboldt, Mendocino	20 hr
Nov 21, 2:12 PM PST	Frost Advisory	LOX		18 hr
Nov 23, 2:30 AM PST	Frost Advisory	EKA	Del Norte, Humboldt, Mendocino	31 hr
Nov 23, 1:46 PM PST	Frost Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 1 more	19 hr
Nov 23, 2:24 PM PST	Frost Advisory	LOX		19 hr
Nov 24, 2:49 PM PST	Frost Advisory	MTR	Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 1 more	18 hr
Nov 25, 3:04 AM PST	Frost Advisory	EKA	Humboldt, Mendocino	6 hr
Nov 25, 1:21 PM PST	Frost Advisory	EKA	Humboldt, Mendocino	20 hr
Dec 2, 2:47 PM PST	Frost Advisory	EKA	Mendocino	18 hr
Dec 4, 2:08 PM PST	Frost Advisory	EKA	Humboldt, Mendocino	19 hr
Dec 9, 2:45 AM PST	Frost Advisory	STO		31 hr
Dec 9, 12:54 PM PST	Frost Advisory	EKA	Del Norte, Humboldt	20 hr
Dec 10, 3:08 AM PST	Frost Advisory	LOX	Los Angeles	29 hr
Dec 14, 8:24 PM PST	Frost Advisory	SGX	Riverside, San Bernardino, San Diego	13 hr
Dec 14, 8:26 PM PST	Frost Advisory	LOX	Los Angeles	81 min
Dec 14, 9:47 PM PST	Frost Advisory	LOX	Los Angeles	11 hr
Dec 16, 4:21 AM PST	Frost Advisory	EKA	Del Norte, Humboldt, Mendocino	29 hr
Dec 17, 11:36 AM PST	Frost Advisory	SGX	Riverside, San Bernardino, San Diego	20 hr
Dec 17, 8:35 PM PST	Frost Advisory	EKA	Humboldt, Mendocino	12 hr
Dec 18, 12:08 AM PST	Frost Advisory	LOX		9 hr
Dec 18, 1:47 AM PST	Frost Advisory	SGX	Riverside, San Bernardino, San Diego	30 hr
Dec 19, 2:28 AM PST	Frost Advisory	SGX	Riverside, San Bernardino, San Diego	30 hr
Dec 27, 2:13 PM PST	Frost Advisory	LOX	Los Angeles	18 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2020 2022

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. Rebuilt daily.