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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

Delta Threshold Days by Year

15 fixed thresholds counted per year at Delta (MXN00002011): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Delta Thresholds

  • Delta: days with a maximum temperature at or above 30 C (86 F) in 51 years, most in 1950 with 314.
  • Delta: days with a maximum temperature at or above 35 C (95 F) in 51 years, most in 1950 with 255.
  • Delta: days with a maximum temperature at or above 40 C (104 F) in 51 years, most in 1950 with 169.
  • Delta: days with a maximum temperature at or above 45 C (113 F) in 51 years, most in 1953 with 77.
  • 15 fixed thresholds have at least one qualifying day at Delta.
51 years with a qualifying day
Days at or above 30 C (86 F) per year at Delta Days per year at Delta with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 314 in 1950. 01002003004001949: 2391950: 3141951: 2001952: 1911953: 2661954: 2221955: 2181957: 2321958: 2091959: 2581960: 2501961: 2111962: 2261964: 2081965: 2131966: 2821967: 2841968: 2311969: 2101970: 2061971: 2141972: 2281973: 2001974: 2121975: 2041976: 2091977: 1931978: 1741979: 1991980: 2071981: 2271982: 2131983: 2001985: 2101986: 2201987: 2001988: 2091996: 2401998: 2111999: 2242000: 2072001: 2232003: 1782004: 2162005: 2162006: 2102007: 2302008: 2282009: 2162010: 2062011: 203194919551962196919751981198820032009
Days per year at Delta with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 314 in 1950.
Days at or above 30 C (86 F) per year at Delta
YearDaysDecade average
1949239239
1950314234.4
1951200234.4
1952191234.4
1953266234.4
1954222234.4
1955218234.4
1957232234.4
1958209234.4
1959258234.4
1960250235
1961211235
1962226235
1964208235
1965213235
1966282235
1967284235
1968231235
1969210235
1970206203.9
1971214203.9
1972228203.9
1973200203.9
1974212203.9
1975204203.9
1976209203.9
1977193203.9
1978174203.9
1979199203.9
1980207210.8
1981227210.8
1982213210.8
1983200210.8
1985210210.8
1986220210.8
1987200210.8
1988209210.8
1996240225
1998211225
1999224225
2000207213.8
2001223213.8
2003178213.8
2004216213.8
2005216213.8
2006210213.8
2007230213.8
2008228213.8
2009216213.8
2010206204.5
2011203204.5
First to last qualifying date each year at Delta For each year, a bar from the first to the last day at Delta meeting 30 C (86 F). 1949: 19 March 1949 to 7 December 19491950: 18 January 1950 to 29 December 19501951: 10 January 1951 to 23 November 19511952: 13 April 1952 to 16 December 19521953: 3 January 1953 to 13 November 19531954: 6 February 1954 to 30 November 19541955: 15 February 1955 to 23 December 19551957: 1 January 1957 to 27 October 19571958: 18 March 1958 to 13 December 19581959: 17 January 1959 to 25 December 19591960: 10 January 1960 to 11 November 19601961: 21 January 1961 to 25 November 19611962: 8 January 1962 to 29 November 19621964: 18 March 1964 to 25 December 19641965: 19 January 1965 to 12 November 19651966: 7 March 1966 to 26 December 19661967: 1 January 1967 to 18 November 19671968: 19 February 1968 to 23 November 19681969: 7 January 1969 to 5 November 19691970: 14 March 1970 to 11 November 19701971: 18 January 1971 to 20 November 19711972: 17 February 1972 to 24 October 19721973: 6 April 1973 to 12 November 19731974: 26 February 1974 to 21 November 19741975: 25 February 1975 to 16 November 19751976: 28 February 1976 to 24 November 19761977: 14 February 1977 to 5 December 19771978: 24 February 1978 to 9 November 19781979: 7 March 1979 to 3 November 19791980: 27 February 1980 to 29 November 19801981: 16 February 1981 to 24 November 19811982: 15 February 1982 to 6 November 19821983: 12 March 1983 to 27 November 19831985: 16 February 1985 to 7 November 19851986: 23 February 1986 to 21 November 19861987: 12 February 1987 to 26 October 19871988: 14 March 1988 to 23 November 19881996: 15 January 1996 to 20 November 19961998: 12 March 1998 to 29 November 19981999: 18 February 1999 to 22 November 19992000: 20 January 2000 to 22 October 20002001: 13 March 2001 to 21 November 20012003: 9 March 2003 to 21 November 20032004: 7 March 2004 to 22 October 20042005: 14 January 2005 to 25 November 20052006: 25 March 2006 to 22 November 20062007: 7 March 2007 to 19 November 20072008: 27 February 2008 to 20 November 20082009: 25 February 2009 to 11 November 20092010: 16 March 2010 to 16 November 20102011: 17 January 2011 to 31 October 201119491957196519721979198720032010JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Delta meeting 30 C (86 F).
First to last qualifying date each year at Delta
YearFirst dateLast date
19491949-03-191949-12-07
19501950-01-181950-12-29
19511951-01-101951-11-23
19521952-04-131952-12-16
19531953-01-031953-11-13
19541954-02-061954-11-30
19551955-02-151955-12-23
19571957-01-011957-10-27
19581958-03-181958-12-13
19591959-01-171959-12-25
19601960-01-101960-11-11
19611961-01-211961-11-25
19621962-01-081962-11-29
19641964-03-181964-12-25
19651965-01-191965-11-12
19661966-03-071966-12-26
19671967-01-011967-11-18
19681968-02-191968-11-23
19691969-01-071969-11-05
19701970-03-141970-11-11
19711971-01-181971-11-20
19721972-02-171972-10-24
19731973-04-061973-11-12
19741974-02-261974-11-21
19751975-02-251975-11-16
19761976-02-281976-11-24
19771977-02-141977-12-05
19781978-02-241978-11-09
19791979-03-071979-11-03
19801980-02-271980-11-29
19811981-02-161981-11-24
19821982-02-151982-11-06
19831983-03-121983-11-27
19851985-02-161985-11-07
19861986-02-231986-11-21
19871987-02-121987-10-26
19881988-03-141988-11-23
19961996-01-151996-11-20
19981998-03-121998-11-29
19991999-02-181999-11-22
20002000-01-202000-10-22
20012001-03-132001-11-21
20032003-03-092003-11-21
20042004-03-072004-10-22
20052005-01-142005-11-25
20062006-03-252006-11-22
20072007-03-072007-11-19
20082008-02-272008-11-20
20092009-02-252009-11-11
20102010-03-162010-11-16
20112011-01-172011-10-31

Every Fixed Threshold

Fixed thresholds at Delta
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days513141950203
35 C (95 F): Days512551950160
40 C (104 F): Days511691950109
45 C (113 F): Days5177195340
50 C (122 F): Days125519531
90 F (32.2 C): Days512731950183
100 F (37.8 C): Days512011950134
110 F (43.3 C): Days5191195058
120 F (48.9 C): Days245619531
0 C (32 F): Frost days (min413019496
20 C (68 F): Tropical nights (min51134198183
25 C (77 F): Days with min5180198138
10 mm (0.39 in): Days with 10 mm or more rain28619832
25 mm (0.98 in): Days with 25 mm or more rain9219721
50 mm (1.97 in): Days with 50 mm or more rain1119721

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

Download the Data

  • Data for Delta 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

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