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Built 2026-10-19 (19 October 2026)

Karnack Threshold Days by Year (USC00414693)

17 fixed thresholds counted per year at Karnack (USC00414693): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Karnack Thresholds

  • Karnack: days with 10 mm (0.39 in) or more of precipitation in 57 years, most in 1957 with 52.
  • Karnack: days with 25 mm (0.98 in) or more of precipitation in 57 years, most in 1994 with 25.
  • Karnack: days with 50 mm (1.97 in) or more of precipitation in 57 years, most in 1991 with 9.
  • Karnack: days with a maximum temperature at or above 30 C (86 F) in 31 years, most in 1963 with 174.
  • 17 fixed thresholds have at least one qualifying day at Karnack.
31 years with a qualifying day
Days at or above 30 C (86 F) per year at Karnack Days per year at Karnack with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 174 in 1963. 0501001502001943: 1321944: 1191945: 1071946: 701948: 1491949: 1281950: 1261951: 1321952: 1401953: 1361954: 1481955: 1651956: 1541957: 1201958: 1221959: 1291960: 1411961: 1001962: 1501963: 1741964: 1021965: 1221966: 1151967: 1251968: 1041969: 1351970: 1261971: 1121972: 1081973: 1141974: 12219431948195219561960196419681972
Days per year at Karnack with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 174 in 1963.
Days at or above 30 C (86 F) per year at Karnack
YearDaysDecade average
1943132117.5
1944119117.5
1945107117.5
194670117.5
1948149117.5
1949128117.5
1950126137.2
1951132137.2
1952140137.2
1953136137.2
1954148137.2
1955165137.2
1956154137.2
1957120137.2
1958122137.2
1959129137.2
1960141126.8
1961100126.8
1962150126.8
1963174126.8
1964102126.8
1965122126.8
1966115126.8
1967125126.8
1968104126.8
1969135126.8
1970126116.4
1971112116.4
1972108116.4
1973114116.4
1974122116.4
First to last qualifying date each year at Karnack For each year, a bar from the first to the last day at Karnack meeting 30 C (86 F). 1943: 25 April 1943 to 21 October 19431944: 21 April 1944 to 27 October 19441945: 25 April 1945 to 2 November 19451946: 31 March 1946 to 7 October 19461948: 7 April 1948 to 31 October 19481949: 8 April 1949 to 12 October 19491950: 25 January 1950 to 30 October 19501951: 3 March 1951 to 30 October 19511952: 30 April 1952 to 26 October 19521953: 2 May 1953 to 22 October 19531954: 11 March 1954 to 30 September 19541955: 10 March 1955 to 24 December 19551956: 28 April 1956 to 19 October 19561957: 11 May 1957 to 4 October 19571958: 4 April 1958 to 10 October 19581959: 30 April 1959 to 12 October 19591960: 31 March 1960 to 4 October 19601961: 25 April 1961 to 30 September 19611962: 29 April 1962 to 19 October 19621963: 17 March 1963 to 6 November 19631964: 3 April 1964 to 3 October 19641965: 18 April 1965 to 26 November 19651966: 31 March 1966 to 14 October 19661967: 11 March 1967 to 14 October 19671968: 13 May 1968 to 15 October 19681969: 20 May 1969 to 13 October 19691970: 21 April 1970 to 5 October 19701971: 23 May 1971 to 6 October 19711972: 7 April 1972 to 31 October 19721973: 9 May 1973 to 10 October 19731974: 19 March 1974 to 18 October 197419431948195219561960196419681972JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Karnack meeting 30 C (86 F).
First to last qualifying date each year at Karnack
YearFirst dateLast date
19431943-04-251943-10-21
19441944-04-211944-10-27
19451945-04-251945-11-02
19461946-03-311946-10-07
19481948-04-071948-10-31
19491949-04-081949-10-12
19501950-01-251950-10-30
19511951-03-031951-10-30
19521952-04-301952-10-26
19531953-05-021953-10-22
19541954-03-111954-09-30
19551955-03-101955-12-24
19561956-04-281956-10-19
19571957-05-111957-10-04
19581958-04-041958-10-10
19591959-04-301959-10-12
19601960-03-311960-10-04
19611961-04-251961-09-30
19621962-04-291962-10-19
19631963-03-171963-11-06
19641964-04-031964-10-03
19651965-04-181965-11-26
19661966-03-311966-10-14
19671967-03-111967-10-14
19681968-05-131968-10-15
19691969-05-201969-10-13
19701970-04-211970-10-05
19711971-05-231971-10-06
19721972-04-071972-10-31
19731973-05-091973-10-10
19741974-03-191974-10-18

Every Fixed Threshold

Fixed thresholds at Karnack
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days311741963122
35 C (95 F): Days3094195429
40 C (104 F): Days121219542
90 F (32.2 C): Days31127196389
100 F (37.8 C): Days234219546
0 C (32 F): Ice days (max121019483
0 C (32 F): Frost days (min3065194840
-10 C (14 F): Days with min11519431
-20 C (-4 F): Days with min1119511
20 C (68 F): Tropical nights (min30119196396
25 C (77 F): Days with min221719632
10 mm (0.39 in): Days with 10 mm or more rain5752195723
25 mm (0.98 in): Days with 25 mm or more rain5725199412
50 mm (1.97 in): Days with 50 mm or more rain57919915
100 mm (3.94 in): Days with 100 mm or more rain12219581
200 mm (7.87 in): Days with 200 mm or more rain1119921
10 cm (3.9 in): Days with 10 cm or more snowfall2119771

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1943.

Download the Data

  • Data for Karnack threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).