Siskiyou County, California severe weather history spans 92 recorded events between 1958 and 2024. The dominant hazard is hail, accounting for 25.0% of all recorded events. It ranks #2,914 nationally and #40 in California.
92
Recorded events
0
Direct deaths
2
Direct injuries
$200K
Property damage
The record
What the Siskiyou County, California severe weather history record shows
Across the archive, Siskiyou County, California severe weather history averages 1.4 recorded events a year. The busiest stretch on record is the 2010s, with 30 events logged in that decade alone. Roughly 3 events fall before 1990 and 89 from 1990 onward — a gap that reflects the expansion of NOAA reporting practice as much as the weather itself.
The costliest is thunderstorm wind, with $200K in reported property damage. In total, 9 distinct hazard types appear in this county archive, each listed with its own dated record below.
By hazard type
Every hazard type recorded in Siskiyou County
| Hazard | Events | Deaths | Damage | Max | Span |
|---|---|---|---|---|---|
| Hail | 23 | 0 | $0 | 2 | 1958–2018 |
| Flash Flood | 20 | 0 | $0 | 0 | 1997–2023 |
| Thunderstorm Wind | 15 | 0 | $200K | 80 | 1990–2024 |
| Flood | 10 | 0 | $0 | 0 | 1997–2017 |
| Heavy Rain | 9 | 0 | $0 | 0 | 1998–2023 |
| Debris Flow | 8 | 0 | $0 | 0 | 2014–2021 |
| Wildfire | 4 | 0 | $0 | 0 | 2003–2003 |
| Lightning | 2 | 0 | $0 | 0 | 2003–2018 |
| Tornado | 1 | 0 | $0 | F1 | 1958–1958 |
Decade by decade
Siskiyou County, California severe weather history by decade
Reporting practice changed over time — early decades are undercounted, not calmer.
Tornado tracks
Paths crossing this county
1 mapped tornado paths intersect this county: 1 touched down inside it and 0 crossed in from a neighbouring county. This comes from path geometry, not county-tagged reports.
| Date | Scale | Deaths | Injuries | Path length | Origin |
|---|---|---|---|---|---|
| 1958-05-22 | EF1 | 0 | 0 | 2.7 mi | Touched down here |
Significant events
Deadliest events on record in Siskiyou County
| Date | Type | Location | Deaths | Injuries | Damage |
|---|---|---|---|---|---|
| Aug 3, 2022 | Flash Flood | KLAMATH RIVER | 0 | 1 | $0 |
| May 23, 2018 | Lightning | MT HEBRON | 0 | 1 | $0 |
From the record
What the reports say
Written by National Weather Service staff at the time of the event · public domain
Thunderstorms with very heavy rain moved through an area near the McKinney wildfire in the late afternoon and evening, around 230 PM to 8 PM PST. Rainfall was estimated to be at a rate of up to 1 inch per hour, with 1 to 3 inches total. This created 2 mud slides that closed portions of Highway 96. The first was reported 2 miles east of the community of Klamath River at 327 PM PST, and the second 2 miles southwest of Klamath River at 635 PM PST.
Thunderstorms with very heavy rain moved through an area near the McKinney wildfire in the evening. Rainfall was estimated to be between 1 and 3 inches in an hour. This created a debris flow down Humbug Creek, on the eastern edge of the fire. Four vehicles were reported swept off a culvert over Humbug Creek, and videos showed the swiftly rising water in the area. One person had to be rescued from a partially submerged vehicle. He sustained injuries, but survived.
Heavy convective precipitation combined with glacial melt from the Whitney Glacier on Mount Shasta to create a debris flow down Whitney Creek, downstream from the Lava Fire scar. This resulted in the closure of US97 between 1700 PDT and 2100 PDT.
Context
Risk, population and federal disasters
Relatively Moderate
FEMA NRI risk rating
43,466
Population (ACS)
$310K
Median home value
23
Federal declarations
| Declared | Incident | Title | Type |
|---|---|---|---|
| Nov 21, 2023 | Hurricane | TROPICAL STORM HILARY | DR |
| Jan 14, 2023 | Flood | SEVERE WINTER STORMS, FLOODING, LANDSLIDES, AND MUDSLIDES | DR |
| Sep 2, 2022 | Fire | MILL FIRE | FM |
| Jun 29, 2021 | Fire | LAVA FIRE | FM |
| Oct 16, 2020 | Fire | WILDFIRES | DR |
| Sep 9, 2020 | Fire | SLATER FIRE | FM |
Quick answers
Frequently asked
How many severe weather events have been recorded in Siskiyou County, California?
92 events are on record between 1958 and 2024, causing 0 direct deaths and $200K in property damage.
What is the most common severe weather hazard in Siskiyou County?
Hail, with 23 recorded events — 25.0% of everything in the archive for this county.
How many tornadoes have crossed Siskiyou County?
1 mapped tornado paths intersect the county boundary; 1 of them touched down inside it. This is derived from path geometry, not county-tagged reports.
How many federal disaster declarations cover Siskiyou County?
23 federal disaster declarations from FEMA include Siskiyou County, each tied to a specific incident period.
How risky is Siskiyou County compared with the rest of the country?
FEMA's National Risk Index rates Siskiyou County as relatively moderate risk, placing it in the 89 percentile of its state for expected annual loss.
Where does the Siskiyou County, California severe weather history data come from?
Every figure is drawn from United States federal public-domain records: NOAA/NCEI Storm Events for the event archive, NOAA SPC SVRGIS for mapped tornado paths, FEMA for disaster declarations and risk ratings, and the U.S. Census for population context. Dates are shown in UTC and recent entries may still be revised by NOAA.
Nearby
Neighbouring counties
- Sierra County 60
- Solano County 52
- Shasta County 193
- Sonoma County 419
- Santa Cruz County 201
- Stanislaus County 80
Cite this page
“Siskiyou County, California.” Severe Weather History. severeweatherhistory.com/county/california/siskiyou-county/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.