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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

San Juan Threshold Days by Year (MXN00019056)

15 fixed thresholds counted per year at San Juan (MXN00019056): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Juan Thresholds

  • San Juan: days with 10 mm (0.39 in) or more of precipitation in 56 years, most in 1973 with 40.
  • San Juan: days with 25 mm (0.98 in) or more of precipitation in 56 years, most in 2010 with 17.
  • San Juan: days with a maximum temperature at or above 30 C (86 F) in 53 years, most in 1969 with 285.
  • San Juan: days with a maximum temperature at or above 35 C (95 F) in 53 years, most in 1959 with 236.
  • 15 fixed thresholds have at least one qualifying day at San Juan.
53 years with a qualifying day
Days at or above 30 C (86 F) per year at San Juan Days per year at San Juan with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 285 in 1969. 01002003001951: 2511952: 2281953: 2561954: 2481955: 2511956: 2751957: 2571958: 2331959: 2731962: 1801963: 2061964: 2311965: 2531966: 2411967: 2271968: 2281969: 2851970: 2001971: 1771972: 1451973: 1891974: 1681975: 2051976: 1691977: 1871978: 1791979: 2161980: 2161981: 2111982: 2301983: 2161985: 2181986: 2201987: 1971988: 2171989: 2261990: 2161991: 2091992: 2051993: 2071994: 2121995: 2281996: 2541997: 2171998: 2441999: 2702001: 2232002: 2362004: 2052005: 2082006: 2162008: 2482010: 204195119571965197119771983199019962004
Days per year at San Juan with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 285 in 1969.
Days at or above 30 C (86 F) per year at San Juan
YearDaysDecade average
1951251252.4
1952228252.4
1953256252.4
1954248252.4
1955251252.4
1956275252.4
1957257252.4
1958233252.4
1959273252.4
1962180231.4
1963206231.4
1964231231.4
1965253231.4
1966241231.4
1967227231.4
1968228231.4
1969285231.4
1970200183.5
1971177183.5
1972145183.5
1973189183.5
1974168183.5
1975205183.5
1976169183.5
1977187183.5
1978179183.5
1979216183.5
1980216216.8
1981211216.8
1982230216.8
1983216216.8
1985218216.8
1986220216.8
1987197216.8
1988217216.8
1989226216.8
1990216226.2
1991209226.2
1992205226.2
1993207226.2
1994212226.2
1995228226.2
1996254226.2
1997217226.2
1998244226.2
1999270226.2
2001223222.7
2002236222.7
2004205222.7
2005208222.7
2006216222.7
2008248222.7
2010204204
First to last qualifying date each year at San Juan For each year, a bar from the first to the last day at San Juan meeting 30 C (86 F). 1951: 1 January 1951 to 31 December 19511952: 1 January 1952 to 9 December 19521953: 6 January 1953 to 5 December 19531954: 20 January 1954 to 23 December 19541955: 1 January 1955 to 28 December 19551956: 1 January 1956 to 15 December 19561957: 3 January 1957 to 30 December 19571958: 30 January 1958 to 7 December 19581959: 3 January 1959 to 31 December 19591962: 5 February 1962 to 17 November 19621963: 8 February 1963 to 12 November 19631964: 1 March 1964 to 31 December 19641965: 7 January 1965 to 31 December 19651966: 7 January 1966 to 26 November 19661967: 1 February 1967 to 11 November 19671968: 26 January 1968 to 27 December 19681969: 7 January 1969 to 30 December 19691970: 10 February 1970 to 28 October 19701971: 4 March 1971 to 29 December 19711972: 29 February 1972 to 26 December 19721973: 21 January 1973 to 31 December 19731974: 1 January 1974 to 1 November 19741975: 10 January 1975 to 30 November 19751976: 2 January 1976 to 24 October 19761977: 18 February 1977 to 19 December 19771978: 1 March 1978 to 20 December 19781979: 13 February 1979 to 22 November 19791980: 21 February 1980 to 18 December 19801981: 28 January 1981 to 29 December 19811982: 6 January 1982 to 24 December 19821983: 9 February 1983 to 11 December 19831985: 21 February 1985 to 31 December 19851986: 18 January 1986 to 23 November 19861987: 27 January 1987 to 7 December 19871988: 14 February 1988 to 27 December 19881989: 5 January 1989 to 27 November 19891990: 11 January 1990 to 30 December 19901991: 29 January 1991 to 30 November 19911992: 15 February 1992 to 10 December 19921993: 8 January 1993 to 10 December 19931994: 6 January 1994 to 8 December 19941995: 11 January 1995 to 17 December 19951996: 1 January 1996 to 30 December 19961997: 2 January 1997 to 28 November 19971998: 4 January 1998 to 29 December 19981999: 13 January 1999 to 31 December 19992001: 8 January 2001 to 13 December 20012002: 10 January 2002 to 19 December 20022004: 4 January 2004 to 29 November 20042005: 10 January 2005 to 31 December 20052006: 1 January 2006 to 20 December 20062008: 2 February 2008 to 31 December 20082010: 20 January 2010 to 30 December 201019511958196719741981198919962005JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Juan meeting 30 C (86 F).
First to last qualifying date each year at San Juan
YearFirst dateLast date
19511951-01-011951-12-31
19521952-01-011952-12-09
19531953-01-061953-12-05
19541954-01-201954-12-23
19551955-01-011955-12-28
19561956-01-011956-12-15
19571957-01-031957-12-30
19581958-01-301958-12-07
19591959-01-031959-12-31
19621962-02-051962-11-17
19631963-02-081963-11-12
19641964-03-011964-12-31
19651965-01-071965-12-31
19661966-01-071966-11-26
19671967-02-011967-11-11
19681968-01-261968-12-27
19691969-01-071969-12-30
19701970-02-101970-10-28
19711971-03-041971-12-29
19721972-02-291972-12-26
19731973-01-211973-12-31
19741974-01-011974-11-01
19751975-01-101975-11-30
19761976-01-021976-10-24
19771977-02-181977-12-19
19781978-03-011978-12-20
19791979-02-131979-11-22
19801980-02-211980-12-18
19811981-01-281981-12-29
19821982-01-061982-12-24
19831983-02-091983-12-11
19851985-02-211985-12-31
19861986-01-181986-11-23
19871987-01-271987-12-07
19881988-02-141988-12-27
19891989-01-051989-11-27
19901990-01-111990-12-30
19911991-01-291991-11-30
19921992-02-151992-12-10
19931993-01-081993-12-10
19941994-01-061994-12-08
19951995-01-111995-12-17
19961996-01-011996-12-30
19971997-01-021997-11-28
19981998-01-041998-12-29
19991999-01-131999-12-31
20012001-01-082001-12-13
20022002-01-102002-12-19
20042004-01-042004-11-29
20052005-01-102005-12-31
20062006-01-012006-12-20
20082008-02-022008-12-31
20102010-01-202010-12-30

Every Fixed Threshold

Fixed thresholds at San Juan
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days532851969204
35 C (95 F): Days53236195969
40 C (104 F): Days5110319531
45 C (113 F): Days8919981
90 F (32.2 C): Days532521959142
100 F (37.8 C): Days53148195910
110 F (43.3 C): Days201719535
0 C (32 F): Ice days (max1119971
0 C (32 F): Frost days (min4525198512
20 C (68 F): Tropical nights (min531731969150
25 C (77 F): Days with min4144199627
10 mm (0.39 in): Days with 10 mm or more rain5640197333
25 mm (0.98 in): Days with 25 mm or more rain5617201017
50 mm (1.97 in): Days with 50 mm or more rain4810201010
100 mm (3.94 in): Days with 100 mm or more rain14419683

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1951.

Download the Data

  • Data for San Juan 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).