Napa County

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Napa 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 CA GS (2,639), NASA (6).

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. Jan 1, 2006Flood$115 million
   National Weather Service narrative

   Major flooding continued into the early hours of January 1st, before the Napa River finally fell below flood stage and the water receeded. Flooding was severe in Downtown Napa from the Napa Creek and the City and Parks Department was hit with $6 million in damage alone. The City of Napa had 600 homes with moderate damage, 150 damaged businesses with costs of at least $70 million.

2. Apr 1, 2006Debris Flow, North Bay Interior Valleys$14.4 million
   National Weather Service narrative

   Persistent heavy rainfall caused a massive number of landslides across the Sonoma and Marin County valleys area during the first half of April. About $20 million of damage was done to agriculture, with over $9 million spent in road repair damage in Sonoma County alone. Over $5 million worth of damage was done to single family dwellings in Sonoma - with lesser (but still substantial) amounts of damage experienced to businesses and public buildings. In Marin county the hardest hit areas were Mill Valley, Fairfax and San Rafael. In Mill Valley a man was killed after he was buried in a mudslide in his back yeard.

3. Mar 25, 2011Debris Flow, North Bay Interior Valleys$855,000
   National Weather Service narrative

   In San Anselmo heavy rain and strong wind caused mudslides, trees to blow down and power poles to topple. The following are other damage reports from around the city. On Florence Road trees fell into the public right of way blocking the roadway and crushing a car. It also took down several PGE, cable and telephone poles. On Woodruff Ave, a mudslide traveled 1/4 mile down the road carrying structure debris and blocking a main intersection that accesses 12 homes. On Scenic Ave, a mudslide entered a roadway and wind blew down a few power poles. At 29 Summit Ave, a mudslide closed roads; caused water, gas and sewer lines to break and took out numerous trees. On Redwood Rd, the road…

4. Jan 20, 2010Strong Wind, North Bay Interior Valleys$435,000
   National Weather Service narrative

   Strong winds and saturated soil combined to knock over a 50-foot Douglas fir tree along Turnagain Road in Kentfield. In Sonoma, a fallen tree smashed a home. In Santa Rosa, a tree crashed down onto a home on Proctor Drive rendering it uninhabitable. In Yountville a 150- to 200-year-old Coast Live Oak toppled next to a home on Humboldt Street causing damage to a fence. Also in Santa Rosa, A 50-foot-plus Cedar tree came down onto a home on Manor Drive damaging the back area of the house. Along State Route 12, a tree fell onto a moving vehicle just east of Glen Ellen causing closure of the roadway. In Sonoma, a redwood tree fell through the roof of the K building at Sonoma Valley…

5. Mar 16, 2012Strong Wind, North Bay Interior Valleys$400,000
   National Weather Service narrative

   A very large fir tree cleaved one Camp Meeker house in half and crushed another around 10:00 am. Camp Meeker is between Occidental and Monte Rio.

6. Feb 15, 2011High Wind, North Bay Interior Valleys$250,000
   National Weather Service narrative

   Strong and gusty wind developed ahead of a long wave trough. Southwest to west wind began to increase during the afternoon and peaked in the evening. A trained weather spotter reported a measured wind gust of 60 MPH at 6:15 p.m. PST. Other automated observation systems around the area above 1,000 feet in elevation reported gusts up to 83 MPH. The wind caused large trees and power lines to fall. Also, road closures occurred due to the downed trees and power lines. Of note, Porter Creek Road was closed until 3:00 p.m. Wednesday due to the efforts of removing a large tree that fell across the roadway. Overall, more than a dozen power poles were pushed down in Marin County.

7. Dec 3, 2011Strong Wind, North Bay Interior Valleys$200,000
   National Weather Service narrative

   A wind-driven fire destroyed a large barn in Santa Rosa and spread to two sheds and destroyed several vehicles. The fire also destroyed motorcycles, pickups, a riding lawn mower, and an RV. The fire was sparked by power lines that were blown to the ground.

8. Mar 25, 2011Debris Flow, North Bay Interior Valleys$200,000
   National Weather Service narrative

   Rain saturated Pleasanton Ridge slid causing a water main break leaving 160 residents without potable water.

9. Mar 27, 2012Strong Wind, North Bay Interior Valleys$150,000
   National Weather Service narrative

   A very large oak tree crushed portions of a three bedroom, two bath home on Cascade Drive in Fairfax around 7:00 pm.

10. Apr 14, 2009Strong Wind, North Bay Interior Valleys$120,000
    National Weather Service narrative

    A tree fell into a power line on Pine Street in Novato causing a small fire and knocking out power along the street. In Healdsburg, strong wind brought trees down into power lines knocking out power to downtown for about an hour. Downed trees also caused damage, started small fires and produced power outages in Santa Rosa. Over 5,000 customers lost power during this storm and a recently restored home on Belmont Court was damaged as a large Douglas Fir tree crashed onto it. On Hearn Avenue and on Montgomery Drive two cars were damaged as trees fell onto them.

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

114°FSep 6, 2022

All-time low

14°FDec 22, 1990

Warmest night

80°FMay 15, 2008

Coldest day

30°FFeb 4, 1903

Wettest day

5.85 inNov 21, 1977

Snowiest day

2.5 inJan 6, 1907

Hottest year

2014mean 62.5°F

Coldest year

1911mean 55.0°F

Wettest year

198351.24 in

Driest year

20136.74 in

Station Napa State Hospital (USC00046074), 35 ft elevation, 4.4 miles from the population centre. Daily records from 1893 to October 26, 2026; 97.2% 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 USC00046074.
• 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.