This story is part of the KXAN Data Hub, where numbers help tell the whole story.We've created several data-driven stories and databases on topics including weather and climate, politics, education, sports and growth in Texas. Each story in the KXAN Data Hub is updated as new data becomes available. AUSTIN (KXAN) — More than 9,800 tornadoes have been reported across the Lone Star State since 1950, according to data from the National Oceanic and Atmospheric Administration (NOAA). KXAN dug through the data to find out when and where tornadoes are most common in Texas. NOAA data shows 9,890 tornadoes were reported statewide between January 1950 and July 2024, the most recent data available. The NOAA data splits tornadoes into multiple "segments." If a tornado crosses a county or state line, it begins a new segment. Therefore, long-track tornadoes that are on the ground for an extended period of time may technically be counted more than once, if they cross into a new county. Temperatures, rain, severe storms: Explore Austin’s 2024 weather data Don't see the charts in this story? Click here. How many tornadoes does Texas get in a typical year? The most tornadoes reported in a single year was 258 in 2015, including the largest outbreak in Central Texas history. A total of 16 tornadoes touched down in the area over Memorial Day weekend, the strongest being an EF-2 twister in Milam County. Only 13 tornadoes were reported statewide in 1952, the fewest for any year. The chart above shows the number of tornadoes reported each year, along with the 10-year average. The average hit a peak of 172.7 tornadoes per year in 1999. Since then, the average per year has declined, to 125.6 in 2023. Some meteorologists see this as evidence that "Tornado Alley" is shifting away from Texas and more toward the southeastern U.S. Where and when are lightning deaths most common? When are tornadoes most common in Texas? Unsurprisingly, tornadoes in Texas are most common during the spring severe weather season. May, in particular, stands out above the other months, with a total of 3,048 tornadoes reported between 1950 and 2024. That breaks down to an average of 42.3 tornadoes every May. Where in Texas are tornadoes most common? Every one of Texas' 254 counties saw at least one tornado between 1950 and 2024. According to the NOAA data, Harris County, home to Houston, has recorded the most twisters: 250 in total. That's well above second-ranked Hale County, north of Lubbock, which had 133 tornadoes in that same time period. Real County, west of San Antonio, and Menard County, southeast of San Angelo, both had two tornadoes, the fewest of any county in Texas. The map below shows the approximate tracks of tornadoes in Texas between 1950 and 2023. In the KXAN viewing area, Travis and Williamson counties both saw the most tornadoes between 1950 and 2024, with 71 each. Llano County had the fewest, with 11. Where were the strongest tornadoes in Texas? The National Weather Service uses the Enhanced Fujita Scale to determine how strong tornadoes are. The NWS does this by looking at damage caused and estimating the wind speeds the tornado likely produced. In Feb. 2007, the NWS revised the original Fujita Scale "to reflect better examinations of tornado damage surveys so as to align wind speeds more closely with associated storm damage." The majority of tornadoes in Texas are weak, according to the Enhanced Fujita Scale. Of the 9,890 tornadoes reported between 1950 and 2024, 77% were rated either F0/EF0 or F1/EF1. Violent tornadoes — those rated F4/EF4 and F5/EF5 — are much rarer. Only 89 such tornadoes were reported during the same time period, accounting for 0.9% of all tornadoes. In fact, only six tornadoes have been rated F5 in Texas since 1950 (none have been rated EF5 since the switch to the Enhanced Fujita Scale): May 11, 1953: McLennan County (Waco), causing 114 deaths, 597 injuries and $25 million in property damage. This is the deadliest tornado in Texas history. April 3, 1964: Wichita County (Wichita Falls), causing 7 deaths, 111 injuries and $25 million in property damage May 11, 1970: Lubbock County (Lubbock), causing 26 deaths, 500 injuries and $250 million in property damage May 6, 1973: McLennan County (Valley Mills), causing no deaths or injuries April 19, 1976: Brown County (Brownwood), causing no deaths, 11 injuries and $2.5 million in property damage May 27, 1997: Williamson County (Jarrell), causing 27 deaths, 12 injuries and $40 million in property damage Just 59 F5/EF5 tornadoes have been reported nationwide since 1950, meaning Texas accounts for about 10% of the nation's strongest twisters. The map above shows the strongest tornadoes reported in each county in Texas. Of the 254 counties statewide: F5/EF5: 5 counties: Brown, Lubbock, McLennan, Wichita and Williamson F4/EF4: 53 counties, including Bexar, Dallas, Harris and Travis F3/EF3: 115 counties F2/EF2: 65 counties F1/EF1: 13 counties F0/EF0: 3 counties: Edwards, Menard and Presidio When were the biggest tornado outbreaks in Texas? Since 1950, Texas has seen 16 calendar days that produced at least 25 tornadoes. The most reported in a single day was 67 on Sept. 20, 1967, associated with the landfall of Hurricane Beulah. The outbreak on March 21, 2022, produced 45 tornadoes in Texas. That means the day ranks second for most tornadoes reported in a single calendar day. May 12, 1982 is the only other day with at least 40 tornadoes reported in Texas.