Delta County

Population 5,549 (2025) 257 sq mi

Property owners in Delta County have filed 1 federal flood insurance claims since 1978, 200th most of 254 counties in Texas.

Hazard fingerprint for Delta County Tornado: 40th percentile. Tropical: 34th percentile. Wildfire: 42th percentile. Flood: 66th percentile. Hail & wind: 42th percentile. Heat: 84th percentile. Cold: 34th percentile. Winter: 17th percentile. TORTROPFIREFLOODSEVEREHEATCOLDWINTER

Hazard fingerprint Each spoke is this county’s percentile among U.S. counties where that hazard occurs. How it is computed

2026
  • Tornado damage paths since 19508
  • Tropical cyclone tracks within 100 miles since 1851, wider where stronger5
  • Wildfire burn scars since 19842

At a glance

The record for Delta County in eight numbers. Each links to its section below.

Flood insurance claims

1

200th of 254 in Texas

$2,841 paid since 2002

Details

Acres burned since 1984

2,422

177th of 254 in Texas

2 large fires; the largest was Cooper Lake, 2006

Details

Tornadoes since 1950

8

236th of 254 in Texas

Fewer than the typical Texas county, which has had 35

Details

Tropical cyclones within 50 mi

3

128th of 254 in Texas

None at hurricane strength since 1851

Details

Strongest tornado

F3

April 22, 1964, 5.9 mile path

Strongest tropical cyclone

TS

Tropical storm Ike, 2008, 23.2 miles away

Federal disaster declarations

18

Most recent: Severe Storms, Straight-Line Winds, Tornadoes, and Flooding, 2024

Details

Record high

115°F

August 10, 1969

Details

Tornadoes

About one every 9.5 years since 1950, one of them rated F3/EF3 or stronger.

Strongest

April 22, 1964

F3, 5.9 mile path

50 yards wide.

Deadliest

June 2, 1954

1 killed, F2

8 injured along the whole path.

Most recent

Friday, January 10, 2020

EF0, 0.1 mile path

6 years ago.

Tornadoes by decade Doppler radar era² 1950s: 3 3 1960s: 1 1 1970s: 1 1 1980s: 0 1990s: 0 2000s: 1 1 2010s: 0 2020s: 2 2 1950s1960s1970s1980s1990s2000s2010s2020s
Recorded tornadoes per decade. The 2020s are incomplete.
Tornadoes by month J: 2 F: 0 M: 0 A: 3 3 M: 2 J: 1 J: 0 A: 0 S: 0 O: 0 N: 0 D: 0 JFMAMJJASOND
By month of occurrence, all years.

Every recorded tornado

Tornadoes in Delta County since 1950
Jan 10, 2020EF00.110000
Jan 10, 2020EF00.515000
May 24, 2003F13.010000
Apr 18, 1977F20.11000
Apr 22, 1964F35.95020
May 24, 1957F270.13300
Apr 2, 1957F20.11021
Jun 2, 1954F25.91,00081
  1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Delta County: 2.
  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.

Hurricanes and tropical storms

3 passed within 50 miles since 1851; none at hurricane strength.

Strongest within 50 miles

September 13, 2008

Ike, Tropical storm

23.2 miles at closest approach, winds near 44 mph.

Most recent

September 13, 2008

Ike, Tropical storm

23.2 miles at closest approach.

Every storm within 100 miles

Tropical cyclones within 100 miles
Ike200823.2Tropical storm44Category 4
Carla196177.7Tropical storm40Category 4
Unnamed194194.8Tropical storm44Category 3
Unnamed191822.1Tropical storm43Category 3
Unnamed190222.8Tropical storm40Category 1
  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.

Wildfire and smoke

2,422 acres burned in 2 large fires since 1984, equal to 1.5% of the land.

Largest

March 14, 2006

Cooper Lake Fire, 1,226 acres

1,218 acres inside Delta County.

Most recent

March 14, 2006

Cooper Lake Fire

1,226 acres in total.

Acres burned since 1984, cumulative 2006: 2,422 2,422 acres 198519901995200020052010201520202025
Running total of acres burned inside the county (line) and each year’s acres (bars).

Every large fire

Large wildfires since 1984
Cooper Lake20061,2181,226
Unnamed20061,2031,635
  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

Smokiest year

2023: 44 days

Heavy smoke on 8 days in 2021, the most of any year.

Last 10 years

13.8 days a year

Medium or heavy smoke, 2016 to 2025.

2025

5 days

Medium or heavy smoke. 20 so far in 2026.

Days with medium or heavy smoke overhead, by year 2011: 11 2012: 11 2013: 5 2014: 3 2015: 6 2016: 0 2017: 4 2018: 5 2019: 3 2020: 13 2021: 29 2022: 20 2023: 44 44 2024: 15 2025: 5 201120122013201420152016201720182019202020212022202320242025
Days each year on which a satellite-traced plume of medium or heavy smoke covered the county’s population centre, 2011 to 2025.
  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.

Floods and flood insurance

1 federal flood insurance claims since 2002, with $2,841 paid.

Federal flood insurance claims by year
Claims per year since 2002. Years with fewer than five claims are not shown.

Flood events since 1996

  • Flash Flood25
  • Heavy Rain5
  • Flood2

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

Most severe crest

May 13, 1982

South Sulphur River near Cooper, 27.21 ft

11.21 feet above the 16.0 ft flood stage; major flooding by today’s categories.

Most recent moderate or major crest

June 12, 2025

South Sulphur River near Cooper, 20.38 ft

Moderate flooding.

Highest river crests above flood stage
May 13, 1982South Sulphur River near Cooper27.21+11.21Major
Dec 10, 1971South Sulphur River near Cooper26.15+10.15Major
Apr 30, 1966South Sulphur River near Cooper26.02+10.02Major
Apr 29, 1953South Sulphur River near Cooper26.00+10.00Major
May 7, 1969South Sulphur River near Cooper25.77+9.77Major
Feb 2, 1975South Sulphur River near Cooper25.68+9.68Major
Apr 27, 1957South Sulphur River near Cooper25.37+9.37Major
Nov 6, 1957South Sulphur River near Cooper25.36+9.36Major
Mar 28, 1977South Sulphur River near Cooper25.16+9.16Major
Feb 13, 1950South Sulphur River near Cooper25.09+9.09Major
Mar 31, 1945South Sulphur River near Cooper24.50+8.50Moderate
Feb 10, 1965South Sulphur River near Cooper24.47+8.47Moderate
Nov 4, 1946South Sulphur River near Cooper24.02+8.02Moderate
May 5, 1979South Sulphur River near Cooper23.91+7.91Moderate
May 3, 1990South Sulphur River near Cooper23.76+7.76Moderate
Jun 6, 1981South Sulphur River near Cooper23.44+7.44Moderate
Mar 2, 2018South Sulphur River near Cooper22.96+6.96Moderate
Dec 16, 1959South Sulphur River near Cooper22.83+6.83Moderate
Apr 23, 1974South Sulphur River near Cooper22.56+6.56Moderate
Mar 18, 2020South Sulphur River near Cooper22.53+6.53Moderate
Apr 25, 1973South Sulphur River near Cooper22.45+6.45Moderate
Sep 9, 1962South Sulphur River near Cooper22.31+6.31Moderate
Oct 25, 1954South Sulphur River near Cooper22.19+6.19Moderate
Apr 26, 1970South Sulphur River near Cooper21.95+5.95Moderate
Nov 1, 2018South Sulphur River near Cooper21.87+5.87Moderate

River gauges

River gauges and their highest listed crests
South Sulphur River near Cooper16.027.21 ftMay 13, 198210
  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.

Drought

In severe drought or worse for 167 of 1,581 months since 1895 (11%); the longest spell lasted 38 months.

167

Months in severe drought or worse since 1895

73

Months in extreme drought

11%

Share of all months, severe or worse

77

Drought reports to the Weather Service since 1996

Lowest reading

July 2006

−5.91, extreme drought

Longest severe spell

38 months

February 1909 to March 1912.

Latest month

September 2026

−3.28, severe drought

Months in severe drought or worse, by year 1895: 0 1896: 7 1897: 2 1898: 4 1899: 0 1900: 0 1901: 8 1902: 6 1903: 0 1904: 0 1905: 0 1906: 0 1907: 0 1908: 0 1909: 11 1910: 12 12 1911: 12 1912: 8 1913: 0 1914: 0 1915: 0 1916: 1 1917: 7 1918: 6 1919: 0 1920: 0 1921: 0 1922: 0 1923: 0 1924: 1 1925: 11 1926: 0 1927: 0 1928: 0 1929: 0 1930: 0 1931: 0 1932: 0 1933: 0 1934: 4 1935: 0 1936: 2 1937: 0 1938: 0 1939: 0 1940: 0 1941: 0 1942: 0 1943: 0 1944: 0 1945: 0 1946: 0 1947: 0 1948: 0 1949: 0 1950: 0 1951: 0 1952: 1 1953: 0 1954: 2 1955: 0 1956: 11 1957: 2 1958: 0 1959: 0 1960: 0 1961: 0 1962: 0 1963: 3 1964: 3 1965: 0 1966: 0 1967: 1 1968: 0 1969: 0 1970: 0 1971: 1 1972: 0 1973: 0 1974: 0 1975: 0 1976: 2 1977: 0 1978: 3 1979: 0 1980: 0 1981: 0 1982: 0 1983: 0 1984: 0 1985: 0 1986: 0 1987: 0 1988: 0 1989: 0 1990: 0 1991: 0 1992: 0 1993: 0 1994: 0 1995: 0 1996: 2 1997: 0 1998: 1 1999: 0 2000: 1 2001: 0 2002: 0 2003: 0 2004: 0 2005: 4 2006: 9 2007: 0 2008: 0 2009: 0 2010: 0 2011: 7 2012: 2 2013: 4 2014: 0 2015: 0 2016: 0 2017: 1 2018: 0 2019: 0 2020: 0 2021: 0 2022: 2 2023: 0 2024: 0 2025: 0 18951905191519251935194519551965197519851995200520152025
Months each year with a Palmer index of −3 or lower, 1895 to 2025. Twelve means the whole year.
  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.

Earthquakes

2 earthquakes of magnitude 2.5 or more within 50 miles since 1968; none reached magnitude 4.

0

Magnitude 2.5+ inside the county since 1973

1

Magnitude 3+ within 50 miles since 1973

0

Magnitude 4+ within 50 miles since 1900

0

Magnitude 5+ within 50 miles since 1900

Largest within 50 miles

October 14, 1968

Magnitude 3.5

2 km WNW of Durant, Oklahoma; 48.5 miles away.

Most recent, magnitude 3 or more

May 30, 1997

Magnitude 3.4

3 km ESE of Neylandville, Texas; 6.8 miles away.

  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.

Severe weather and other events

362 events in the National Weather Service record, 291 of them since 1996.

37

Hail reports, 1 inch or larger

3

Hail, 2 inches or larger

39

Damaging gusts, 58 mph+

24

Winter weather events since 1996

53

Heat events since 1996

6

Cold events since 1996

Largest hail

May 11, 1992

2.75 inches

Strongest measured or estimated gust

September 2, 1982

100 mph

Costliest events since 1996

  1. Oct 1, 2006Drought, Delta$500,000
    National Weather Service narrative

    Persistent drought conditions continued across portions of north Texas. According to the U.S. Drought Monitor, much of the region was still experiencing extreme (D3) drought conditions. The areas which were rated exceptional drought (D4) last month had received enough rainfall to be downgraded into the D3 category this month.|Even though drought conditions were lessened by a few rain events this month, serious hydrological problems remained. For instance, as much water was used from Lake Bridgeport in one month alone as was saved through conservation efforts by north Texas over the summer. Almost every north Texas lake remained well below conservation levels. The rain events this…

  2. May 10, 2008Thunderstorm Wind$150,000
    National Weather Service narrative

    Widespread wind damage was reported with numerous trees and power poles blown down. Some large trees were uprooted. A downburst likely caused the damage, which had a track of about two miles long by a mile and a half wide. Several roofs were ripped off businesses and residences, and street signs and awnings were twisted. The radio tower at the Delta County Law Enforcement Center was broken in half.

  3. May 9, 2024Thunderstorm Wind$150,000
    National Weather Service narrative

    Thunderstorm wind damage due to 80 mph winds was observed across northern Delta County from the Enloe area to the Lake Creek area. The damage started along FM 128, extending east to just past a warehouse business near FM 1335 and Hwy 19. Damage consisted of notable tree damage and structural damage to house roofs and metal roofs. A home near FM 2675 and FM 2949N had windows broken due to wind driven hail. Several trees on the property were uprooted and/or snapped, too. Local officials reported 7 people were injured from the wind driven hail.

  4. Feb 14, 2021Extreme Cold/Wind Chill, Delta$144,000
    National Weather Service narrative

    Extreme cold gripped the county for several days. Overnight lows were near or below 10 degrees Fahrenheit for most of the week. The period of February 15-16th was the coldest with low temperatures between 5 and -5 degrees Fahrenheit, and the maximum temperature on the 15th was only in the lower teens. Wind chill values during the 14th-16th were between 0 to -20 degrees Fahrenheit most of the time. The cold temperatures resulted in an extreme amount of damage to pipes, infrastructure, and power.

  5. May 24, 2003Tornado$75,000
    National Weather Service narrative

    Tornado touchdown between Klondike and Horton on FM 1520. The Fisherman's Motel and Marina in the Klondike area received major roof damage. Several homes had structural damage including roof damage from fallen trees. Residents of the area had no power, telephone service, or water for much of Sunday.

  6. Apr 26, 2017Hail$75,000
    National Weather Service narrative

    A social media report indicated ping pong ball sized hail in the city of Klondike, TX.

  7. May 9, 2024Hail$60,000
    National Weather Service narrative

    Spotter report of 2 inch hail in northern Delta County, along FM 128. This hail was wind-driven by 80 mph winds causing notable damage.

  8. Dec 27, 2015Flood$50,000
    National Weather Service narrative

    Several county and farm-to-market roads remained flooded across the county after several inches of heavy rain.

  9. Mar 8, 2012Thunderstorm Wind$50,000
    National Weather Service narrative

    Damaging downburst winds caused damage near the intersection of State Highway 24 and FM 198. A small barn lost most of its roof, and on the other side of the intersection, a large metal storage building also lost most of its roof. The roof was tossed about a hundred yards from the building. Part of the walls of the storage building collapsed as well. The storage building was determined to be a metal and wood frame with part of the roof partially rotted.

  10. Apr 19, 1996Hail$50,000
    National Weather Service narrative

    Baseball size hail broke windows and damaged roofs.

  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.

Weather records

From Sulphur Springs, 16.3 miles from the county’s population centre, with records from 1893.

All-time high
115°FAug 10, 1969
All-time low
−4°F2 times, most recently Feb 16, 2021
Warmest night
86°FJul 13, 1901
Coldest day
11°F2 times, most recently Feb 16, 2021
Wettest day
8.20 inAug 13, 2017
Snowiest day
9.4 inJan 16, 1964
Hottest year
1998mean 67.4°F
Coldest year
1983mean 60.9°F
Wettest year
195771.09 in
Driest year
195623.46 in
Average monthly high and low temperature and precipitation, last 30 years, Sulphur Springs 32°F 56° 33° 3.0 Jan 59° 37° 3.5 Feb 68° 45° 4.3 Mar 75° 52° 4.4 Apr 82° 62° 4.5 May 90° 70° 4.2 Jun 94° 73° 2.6 Jul 95° 73° 2.7 Aug 90° 65° 2.8 Sep 79° 54° 4.6 Oct 67° 44° 3.9 Nov 58° 36° 4.0 Dec Precipitation, inches
Average daily high and low by month, and average monthly precipitation, over the last 30 years.
Days reaching 95°F per year 1976: 10 1977: 30 1978: 55 1979: 9 1980: 51 1981: 35 1982: 31 1983: 37 1984: 51 1985: 47 1986: 35 1987: 40 1988: 46 1989: 15 1990: 50 1991: 29 1992: 4 1993: 50 1994: 21 1995: 56 1996: 28 1997: 46 1998: 95 1999: 51 2000: 59 2001: 48 2002: 44 2003: 46 2004: 21 2005: 98 98 2006: 59 2007: 5 2008: 16 2009: 20 2010: 40 2011: 89 2012: 50 2013: 51 2015: 50 2016: 60 2017: 23 2018: 77 2019: 39 2020: 29 2021: 18 2022: 59 2023: 53 2024: 33 2025: 28 19761986199620062017
Days reaching 95°F each complete year, last 50 years. Thirty-year average: 46.0.

Station Sulphur Springs (USC00418743), 495 ft elevation, 16.3 miles from the population centre. Daily records from 1893 to October 23, 2026; 97.6% 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.

Federal disaster declarations

18 since 1953. The most recent: Severe Storms, Straight-Line Winds, Tornadoes, and Flooding, May 17, 2024.

Federal disaster declarations
May 17, 2024FloodSevere Storms, Straight-Line Winds, Tornadoes, and FloodingMajor disasterDR-4781-TX
Feb 19, 2021Severe Ice StormSevere Winter StormsMajor disasterDR-4586-TX
Feb 14, 2021Severe Ice StormSevere Winter StormEmergencyEM-3554-TX
Mar 25, 2020BiologicalCovid-19 PandemicMajor disasterDR-4485-TX
Mar 13, 2020BiologicalCovid-19EmergencyEM-3458-TX
Feb 9, 2016Severe StormSevere Winter Storms, Tornadoes, Straight-Line Winds, and FloodingMajor disasterDR-4255-TX
May 29, 2015Severe StormSevere Storms, Tornadoes, Straight-Line Winds and FloodingMajor disasterDR-4223-TX
Mar 14, 2008FireWildfiresEmergencyEM-3284-TX
Jun 29, 2007Severe StormSevere Storms, Tornadoes, and FloodingMajor disasterDR-1709-TX
Jan 11, 2006FireExtreme Wildfire ThreatMajor disasterDR-1624-TX
Sep 24, 2005HurricaneHurricane RitaMajor disasterDR-1606-TX
Sep 21, 2005HurricaneHurricane RitaEmergencyEM-3261-TX
Sep 2, 2005HurricaneHurricane Katrina EvacuationEmergencyEM-3216-TX
Jan 8, 2001Severe Ice StormSevere Winter Ice StormMajor disasterDR-1356-TX
Sep 1, 1999FireExtreme Fire HazardsEmergencyEM-3142-TX
Aug 26, 1998Severe StormTropical Storm CharleyMajor disasterDR-1239-TX
Jan 27, 1972FloodHeavy Rains & FloodingMajor disasterDR-320-TX
May 12, 1966FloodSevere Storms & FloodingMajor disasterDR-218-TX

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.

How this compares

Where Delta County stands among 254 counties in Texas and 3,143 in the United States.

Ranks
Tornadoes since 19508236 / 2542,381 / 3,143
Tornadoes rated F3/EF3 or stronger1128 / 2541,281 / 3,143
Tropical cyclones within 50 mi3128 / 2541,131 / 3,143
Hurricane-strength passes within 50 mi0——
Wildfire acres since 19842,422177 / 2541,136 / 3,143
Flood insurance claims1200 / 2542,799 / 3,143
Flood insurance paid$2,841209 / 2542,795 / 3,143
Disaster declarations18155 / 2541,866 / 3,143
Flood events since 199632174 / 2542,017 / 3,143
Hail and wind events since 199696225 / 2542,797 / 3,143
Winter storm events since 199624143 / 2542,555 / 3,143
Reported damage since 1996$1.8 million230 / 2542,816 / 3,143
River crests at major flood stage1055 / 254524 / 3,143
High tide flooding days a year, last 10 years0.0——
Months in severe drought since 1895167171 / 254597 / 3,143
Medium or heavy smoke days a year, last 10 years13.829 / 2541,835 / 3,143
Earthquakes M4+ within 50 mi since 19000——
Earthquakes M2.5+ in the county since 19730——

Neighbouring counties

Neighbouring counties
Fannin County603060
Franklin County183013
Hopkins County36343636
Hunt County622063
Lamar County4830139
Red River County4039,9440

Sources and vintage

Every number on this page comes from these public records.

  • 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 USC00418743.
  • 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.