Boulder City

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond this area.
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.

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.

Flood insurance figures are for Clark County, the county that contains Boulder City.

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 in Clark County, the county that contains Boulder City.

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.

The drought index is for Clark County, the county that contains Boulder City.

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 city centre.
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.

Mapped landslides

Landslides mapped in Clark County.

Mapped by NV NBMG (81), NASA (5), USGS Conterminous (2), AZ 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. Jun 30, 2016Hail$50.0 million
   National Weather Service narrative

   One to two inch hail fell in a swath across the Las Vegas Valley. Numerous vehicles were damaged.

2. Jul 15, 2012Hail$50.0 million
   National Weather Service narrative

   Hail up to 1.25 inches in diameter fell in a swath from Summerlin to North Las Vegas. According to a local body shop, ten thousand insurance claims were filed for hail damage to vehicles.

3. Aug 20, 2023Flash Flood$25.0 million
   National Weather Service narrative

   Severe flash flooding affected the Spring Mountains. Many roads and underground pipes were washed out, several trails and parking areas were damaged or destroyed, and the fire station was damaged. Video showed multiple feet of water flowing down the mountain.

4. Jul 8, 1999Flash Flood$25.0 million
   National Weather Service narrative

   One of the worst flash flood events this century inundated the Las Vegas Valley damaging roads and buildings, sweeping away vehicles and bringing the entire city almost to a standstill from late morning through late afternoon. Thunderstorms formed over the elevated west side of the valley and began dumping heavy rain between 10 and 11 a.m. PDT. The storms slowly drifted to the east producing rainfall amounts over 1.5 inches across a substantial part of the metro area and some localized amounts topping 3 inches. The downpours forced closure of McCarran International Airport for about one hour and arriving planes were diverted to Los Angeles. Most of the rain ended by noon, but not…

5. Sep 11, 2012Flash Flood$20.0 million
   National Weather Service narrative

   Major flash flooding affected much of the Las Vegas Valley. Numerous roads were closed due to water, mud, and rocks; and several people had to be rescued from vehicles. Many vehicles in parking lots were submerged in muddy water. Many homes, condos, and businesses flooded, and three dogs drowned in one home. Water got into buildings on the UNLV campus as well as a middle school and the MGM Grand Garden Arena. One landscaper died when flood waters swept him off his front-end loader.

6. Jul 20, 1998Heavy Rain$11.0 million
   National Weather Service narrative

   Severe thunderstorms moved into the Las Vegas Valley and nearby Lake Mead bringing wind gusts in excess of 60 mph and heavy showers which dumped between 1.50 and 2.25 inches of rain overnight. Several marinas on Lake Mead suffered extensive wind damage and numerous roads were washed out. In the Las Vegas Valley, heavy rain and flooding produced the majority of damage. Major flooding began in the early morning of July 20 and kept washes filled for several hours with numerous swift water rescues performed during the period. One man apparently died of a heart attack while rescue personnel were trying to remove him from his car. Rapidly accumulating water and a clogged drainage system…

7. Sep 8, 2014Flash Flood$6.0 million
   National Weather Service narrative

   Major flash flooding affected the Moapa, Logandale, and Mesquite areas. Several local roads were washed out and some were covered with five feet of silt. At least 20 homes were damaged and many people were evacuated. Parts of the Union Pacific railroad track were washed out. The parking lot of a power generating plant was filled with six feet of flood water. Interstate 15 suffered major damage and was closed for days. Cars floated down the highway, and one person was injured when he jumped in to help the occupants of a minivan which was swept over a 10-15 foot drop. Four earthen dams were breached in the area.

8. Jan 12, 2013Frost/Freeze, Las Vegas Valley$5.0 million
   National Weather Service narrative

   Numerous homes had water pipes burst due to the cold. Several thousand pressure vacuum breakers also broke. Low temperatures on the outskirts of the Las Vegas Valley got down to 17 degrees.

9. Aug 27, 2007Flash Flood$5.0 million
   National Weather Service narrative

   Flash flooding resulted in 22 swift water rescues in less than three hours. Floodwaters knocked down a 45-foot stretch of stucco wall behind an apartment complex, inundating garages with two feet of water. Many homes had water in them. The damage figure is an estimate.

10. Aug 22, 2012Flash Flood$5.0 million
    National Weather Service narrative

    Significant flash flooding affected much of the Las Vegas Valley. Numerous roads were closed, and several people were rescued from cars. A church was damaged by three feet of water when a retaining wall collapsed. Several people were rescued from washes. One man died when he fell into the Pittman Wash and was swept downstream.

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

120°FJul 7, 2024

All-time low

8°FJan 13, 1963

Warmest night

95°F2 times, most recently Jul 1, 2013

Coldest day

29°FJan 12, 1963

Wettest day

2.58 inAug 21, 1957

Snowiest day

7.4 inJan 31, 1979

Hottest year

2017mean 72.4°F

Coldest year

1949mean 64.3°F

Wettest year

19929.88 in

Driest year

19530.56 in

Snowiest season

16.7 in1948-49

Station Mccarran International Airport (USW00023169), 2,175 ft elevation, 21.1 miles from the city centre. Daily records from 1948 to October 27, 2026; 100.0% 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.

Declarations for Clark County.

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.

• 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 USW00023169.
• 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.
• 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.