Siskiyou County

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Siskiyou County: 0.
2. Weak tornadoes were under-recorded before Doppler radar coverage became national in the early 1990s, so earlier decades read low. Ratings use the Fujita scale before February 2007 and the Enhanced Fujita scale after.

Storm Prediction Center severe weather database, 1950 to 2025.

Every large fire

1. Large fires mapped by the Monitoring Trends in Burn Severity program since 1984: 1,000 acres or more in the West, 500 or more in the East. Prescribed burns are excluded. Acres here are the part of each perimeter inside this place.

Monitoring Trends in Burn Severity (USGS and U.S. Forest Service), 1984 to 2026.

Smoke overhead

1. A smoke day is a date on which a smoke plume traced by NOAA Hazard Mapping System analysts from satellite imagery covered this place's point (the county's population centre or the city centre). Counts here are of medium or heavy smoke. Since 2018 analysts have often drawn light smoke as one area over most of the continent, so light-smoke counts are not comparable from year to year. The plumes show smoke anywhere in the air above, not air quality at the ground, and smoke hidden by cloud is missed.

NOAA Hazard Mapping System smoke analysis, 2011 to 2026, retrieved October 30, 2026.

Claims by ZIP code

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026. NOAA Storm Events through 2026.

River crests

River gauges

1. Crests are the highest and the recent crests the National Weather Service lists for each river gauge in the county that has a flood stage, not every flood. Flood categories use each gauge's current flood stages; crests from before levees, dams or channel changes may not be comparable. Crests measured on an old datum are left out of the rankings.

NOAA National Water Prediction Service gauge records, retrieved October 30, 2026.

1. The Palmer Drought Severity Index is computed by NOAA each month from the county's average temperature and precipitation, relative to the county's own climate. Zero is normal; -3 or lower is severe drought and -4 or lower extreme drought. It describes the long-term balance of moisture, not water supply or crop losses.

NOAA NCEI nClimDiv county Palmer Drought Severity Index, 1895 to September 2026, issued October 6, 2026.

Every earthquake of magnitude 4 or more within 50 miles

1. Earthquakes of magnitude 2.5 or more in the USGS Comprehensive Catalog since 1900. Within 50 miles means the epicentre lies within 50 miles of the county boundary (or inside the county).
2. Small earthquakes were under-recorded before the modern seismic networks of the 1970s and are still missed in remote areas, so early decades read low. Magnitudes are as the catalogue reports them and mix scales (moment, local and body-wave).

USGS ANSS Comprehensive Earthquake Catalog, 1900 to present, retrieved October 30, 2026.

Volcanoes within 100 miles

1. U.S. volcanoes within 100 miles, from the USGS Volcano Hazards Program. The threat category is the USGS 2018 National Volcanic Threat Assessment, which ranks volcanoes by how hazardous their past eruptions were and how many people and how much infrastructure lie near them. It is not a forecast of eruption.

USGS Volcano Hazards Program, retrieved October 30, 2026.

Mapped landslides

Mapped by West Coast Slow Moving (Yuankun and others, 2021) (21), USGS Seismogenic Mass Movements (8), USGS Conterminous (5), NASA (3), CA GS (1).

1. Landslides mapped in the USGS compilation of landslide inventories across the United States (version 3.0, 2025), rated probable or better. The compilation joins inventories made by federal and state agencies for different purposes and areas, so the number mapped in a county reflects how closely it has been surveyed as much as how often its slopes fail. An area with few records may simply not have been mapped. Deaths are as recorded in the inventories; a slide listed in two inventories is counted once.

USGS Landslide Inventories across the United States, version 3.0, retrieved October 27, 2026.

More event types since 1996

Costliest events since 1996

1. Aug 1, 2006Wildfire, Western Siskiyou County$23.5 million
   National Weather Service narrative

   The Bar Complex Fire burned through the month of August. As of 09/07/06, the amount spent on the wildfire was 23.5 million, and the estimated containment date was 09/30/06. 32950 acres were burned, and it was 49% contained.

2. Sep 15, 2014Wildfire, Central Siskiyou County$20.0 million
   National Weather Service narrative

   The Boles fire started on the afternoon of 09/15/14 and spread quickly due to strong winds. It devastated the town of Weed in northern California. In a matter of hours 222 structures were lost, including many homes and part of a lumber mill. As of September 21st, the fire was 479 acres in size and was 100 percent contained. 6.2 million dollars were spent on firefighting efforts.

3. Aug 1, 2006Wildfire, Western Siskiyou County$11.7 million
   National Weather Service narrative

   The Uncles Fire burned through the month of August. As of 09/07/06, the amount spent on the wildfire was 11.7 million, and the estimated containment date was 10/03/06. 19140 acres were burned, and it was 35% contained.

4. Aug 1, 2006Wildfire, Western Siskiyou County$11.1 million
   National Weather Service narrative

   The Happy Camp Complex Fire burned through the month of August. As of 09/07/06, the amount spent on the wildfire was 11.1 million, and the estimated containment date was 10/01/06. 5107 acres were burned, and it was 25% contained.

5. Jan 1, 1997Flood, Siskiyou$11.0 million
   National Weather Service narrative

   A warm southwest flow pushed temperatures into the mid 50s to lower 60s New Years Eve Day with the freezing level rising to above 10,000 ft. Melting snow and moderate rain drove streams and rivers to flood stage. Strong winds spread across northern California...spotters in Siskiyou County reported winds of 35-55 mph with gusts to 70 mph New Years Day..

6. Dec 31, 2005Flood, Central Siskiyou County$7.0 million
   National Weather Service narrative

   A 19 year old woman drowned in Yreka Creek after being swept away during an attempted crossing on foot. Her body was discovered about a mile downstream the next day. Estimated total damage in Siskiyou County was 7 million. 79 homes and businesses were damaged.

7. Jul 26, 2006Wildfire, Western Siskiyou County$6.0 million
   National Weather Service narrative

   Lightning sparked several wildfires in southwest Sisikiyou County on 07/26/06. These fires became known collectively as the Bar Complex. As of 08/08/06, the blaze burned 10,650 acres and 6.0 million dollars were spent on the fire fighting efforts. No structures were lost, and there were no injuries or fatalities. Expected containment date is unknown.

8. Jul 23, 2006Wildfire, Western Siskiyou County$4.9 million
   National Weather Service narrative

   Lightning sparked several wildfires in southwest Sisikiyou County on 07/23/06. Some of these fires became known collectively as the Uncles Complex. As of 08/08/06, the blaze burned 10,250 acres and 4.9 million dollars were spent on the fire fighting efforts. No structures were lost, and no injuries or deaths were reported. Estimated containment date is 10/03/06.

9. Jul 23, 2006Wildfire, Western Siskiyou County$4.5 million
   National Weather Service narrative

   Lightning sparked several wildfires in southwest Sisikiyou County on 07/23/06. Some of these fires became known collectively as the Happy Camp Complex. As of 08/08/06, the blaze burned 3757 acres and 4.5 million dollars were spent on the fire fighting efforts. No structures were lost, but a helicopter picking up water from a local river crashed, killing two people onboard. Estimated containment date is 09/01/06.

10. Jan 20, 2010Heavy Snow, South Central Siskiyou County$2.0 million
    National Weather Service narrative

    A spotter ESE Mount Shasta City reported 10 inches of snow in 9.5 hours between 20/0100 and 20/1030 PST, then 10-12 inches in 12 hours ending at 21/0030 PST. Later he reported a total accumulation of 48 inches of snow in 41.5 hours between 19/1700 and 21/1030 PST. A spotter 4SW Weed reported 24 inches of snow between 19/1600 and 20/1100 PST. A spotter ESE Mount Shasta City reported 24 inches of snow in 48 hours between 18/2000 and 20/2000 PST. A spotter 4SSW Weed reported 18 inches of snow in 10.5 hours between 20/1030 and 20/2100 PST. A spotter 3NW Mount Shasta City reported 33 inches of snow in 48 hours between 18/2100 and 20/2100 PST. A spotter 6NW Mount Shasta City reported 7…

1. Storm Events records before 1996 cover only tornadoes, thunderstorm wind and hail. Damage figures are as reported by the National Weather Service at the time, not adjusted for inflation.

NOAA NCEI Storm Events Database, 1950 to 2026, issued October 26, 2026.

All-time high

111°F3 times, most recently Jul 6, 2024

All-time low

−14°FJan 6, 2017

Warmest night

72°F2 times, most recently Jul 17, 2014

Coldest day

7°FDec 8, 2013

Wettest day

2.14 inDec 30, 2005

Hottest year

2014mean 54.8°F

Coldest year

2011mean 50.1°F

Wettest year

201618.44 in

Driest year

20225.63 in

Station Montague Siskiyou Airport (USW00024259), 2,645 ft elevation, 13.9 miles from the population centre. Daily records from 1948 to October 26, 2026; 85.5% of days in the last 30 years are complete. Records at a single station can differ from a city’s official threaded record, which may combine several stations.

NOAA NCEI Global Historical Climatology Network Daily.

This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).

OpenFEMA Disaster Declarations Summaries, retrieved October 30, 2026. Statewide declarations are not listed.

Neighbouring counties

• Tornadoes NOAA Storm Prediction Center severe weather database, through 2025.
• Tropical cyclones NOAA National Hurricane Center HURDAT2 (Atlantic; Northeast and Central Pacific), through 2025.
• Wildfire USGS/USFS Monitoring Trends in Burn Severity, through 2026.
• Storm events NOAA NCEI Storm Events Database, through 2026.
• Flood insurance OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026.
• Declarations OpenFEMA Disaster Declarations Summaries v2, retrieved October 30, 2026.
• Weather records NOAA NCEI Global Historical Climatology Network Daily, station USW00024259.
• River crests NOAA National Weather Service, National Water Prediction Service river gauges, retrieved October 30, 2026.
• Drought NOAA NCEI nClimDiv county Palmer Drought Severity Index, through September 2026.
• Smoke NOAA NESDIS Hazard Mapping System smoke analysis, retrieved October 30, 2026.
• Volcanoes USGS Volcano Hazards Program, U.S. volcanoes and 2018 threat assessment.
• Landslides USGS Landslide Inventories across the United States, version 3.0 (2025).
• Earthquakes USGS ANSS Comprehensive Earthquake Catalog (ComCat), retrieved October 30, 2026.

Joins, thresholds and known limits are set out in the methodology. Found an error? Report it. Page built October 30, 2026.