Collin County

Every recorded tornado

1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Collin County: 5.
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 storm within 100 miles

1. Tropical storms and hurricanes (34 kt or more, still tropical) at closest approach. Post-tropical remnants with gale-force winds are listed but not counted. Direct: track within 50 miles; near: within 100 miles. Distance is measured to the county boundary for counties and to the city centre for cities, using positions interpolated hourly between HURDAT2 fixes.

National Hurricane Center HURDAT2, 1851 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.

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.

More event types since 1996

Costliest events since 1996

1. May 19, 2023Hail$400 million
   National Weather Service narrative

   A 2.5 inch hail stone was measured near Greenville Avenue and Exchange Parkway in Allen.

2. May 19, 2023Hail$200 million
   National Weather Service narrative

   Two inch hail was reported by a trained spotter at 3865 Preston Road in South Frisco.

3. May 19, 2023Hail$200 million
   National Weather Service narrative

   An NWS Employee reported golf ball sized hail in Plano.

4. May 19, 2023Hail$200 million
   National Weather Service narrative

   Two inch hail was reported via amateur radio near Greenville Avenue and Bethany Drive in Allen.

5. Mar 23, 2016Hail$150 million
   National Weather Service narrative

   Amateur radio reported golf-ball sized hail near the intersection of Parker Road and Dallas North Tollway. The hail shattered windows in cars, homes, and businesses which is what caused most of the damage. The storm causing millions of dollars of damage in Plano and the surrounding area.

6. Mar 23, 2016Hail$150 million
   National Weather Service narrative

   Up to golf ball sized hail in Plano at Park Blvd and Preston Rd, and across many other parts of Plano. The hail shattered windows in cars, homes, and businesses which is what caused most of the damage. The storm causing millions of dollars of damage in Plano and the surrounding area.

7. May 19, 2023Hail$100 million
   National Weather Service narrative

   Two inch hail was reported via amateur radio at Country Club Road and West Lucas Road in Lucas.

8. Mar 23, 2016Hail$100 million
   National Weather Service narrative

   Multiple sources continued to reported golf ball sized hail in Plano; including the intersection of 15th St and Alma Dr. The hail shattered windows in cars, homes, and businesses which is what caused most of the damage. The storm causing millions of dollars of damage in Plano and the surrounding area.

9. Mar 23, 2016Hail$100 million
   National Weather Service narrative

   Golf ball sized hail reported 2 miles north-northeast of Plano. The hail shattered windows in cars, homes, and businesses which is what caused most of the damage. The storm causing millions of dollars of damage in Plano and the surrounding area.

10. May 19, 2023Hail$100 million
    National Weather Service narrative

    Golf ball sized hail was reported in Allen. Damage to a window and car was noted.

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

112°F3 times, most recently Jul 22, 2018

All-time low

0°FJan 23, 1940

Warmest night

89°FJul 22, 2026

Coldest day

13°FDec 22, 1989

Wettest day

6.90 inMar 19, 2006

Snowiest day

7.8 inFeb 11, 2010

Hottest year

2017mean 70.1°F

Coldest year

1940mean 63.7°F

Wettest year

201568.02 in

Driest year

196317.52 in

Snowiest season

14.1 in1977-78

Station Dallas FAA Airport (USW00013960), 484 ft elevation, 20.8 miles from the population centre. Daily records from 1939 to October 27, 2026; 99.8% 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 USW00013960.
• 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.
• 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.