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

San Juan City Threshold Days by Year (RQW00011631)

9 fixed thresholds counted per year at San Juan City (RQW00011631): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for San Juan City Thresholds

  • San Juan City: days with 10 mm (0.39 in) or more of precipitation in 28 years, most in 1952 with 55.
  • San Juan City: days with 25 mm (0.98 in) or more of precipitation in 28 years, most in 1952 with 23.
  • San Juan City: days with 50 mm (1.97 in) or more of precipitation in 27 years, most in 1956 with 7.
  • San Juan City: days with a maximum temperature at or above 30 C (86 F) in 20 years, most in 1971 with 188.
  • 9 fixed thresholds have at least one qualifying day at San Juan City.
20 years with a qualifying day
Days at or above 30 C (86 F) per year at San Juan City Days per year at San Juan City with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 188 in 1971. 0501001502001951: 1721952: 1661953: 1751954: 1291955: 881956: 431957: 611958: 1061959: 951960: 1011961: 771963: 1451964: 1061965: 621966: 861967: 591968: 501969: 1491971: 1881972: 1521951195319551957195919611964196619681971
Days per year at San Juan City with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 188 in 1971.
Days at or above 30 C (86 F) per year at San Juan City
YearDaysDecade average
1951172115
1952166115
1953175115
1954129115
195588115
195643115
195761115
1958106115
195995115
196010192.8
19617792.8
196314592.8
196410692.8
19656292.8
19668692.8
19675992.8
19685092.8
196914992.8
1971188170
1972152170
First to last qualifying date each year at San Juan City For each year, a bar from the first to the last day at San Juan City meeting 30 C (86 F). 1951: 16 January 1951 to 19 December 19511952: 27 February 1952 to 23 November 19521953: 3 January 1953 to 15 December 19531954: 6 February 1954 to 14 December 19541955: 20 January 1955 to 20 November 19551956: 11 January 1956 to 30 December 19561957: 14 February 1957 to 18 December 19571958: 3 January 1958 to 12 December 19581959: 28 February 1959 to 25 December 19591960: 25 January 1960 to 7 December 19601961: 10 March 1961 to 24 December 19611963: 8 January 1963 to 29 December 19631964: 13 January 1964 to 10 November 19641965: 23 February 1965 to 22 December 19651966: 9 January 1966 to 21 November 19661967: 25 February 1967 to 23 November 19671968: 13 February 1968 to 17 December 19681969: 8 January 1969 to 16 December 19691971: 2 January 1971 to 16 November 19711972: 27 March 1972 to 1 December 19721951195419571960196419671971JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at San Juan City meeting 30 C (86 F).
First to last qualifying date each year at San Juan City
YearFirst dateLast date
19511951-01-161951-12-19
19521952-02-271952-11-23
19531953-01-031953-12-15
19541954-02-061954-12-14
19551955-01-201955-11-20
19561956-01-111956-12-30
19571957-02-141957-12-18
19581958-01-031958-12-12
19591959-02-281959-12-25
19601960-01-251960-12-07
19611961-03-101961-12-24
19631963-01-081963-12-29
19641964-01-131964-11-10
19651965-02-231965-12-22
19661966-01-091966-11-21
19671967-02-251967-11-23
19681968-02-131968-12-17
19691969-01-081969-12-16
19711971-01-021971-11-16
19721972-03-271972-12-01

Every Fixed Threshold

Fixed thresholds at San Juan City
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days201881971152
35 C (95 F): Days2119581
90 F (32.2 C): Days2032195116
20 C (68 F): Tropical nights (min203651959355
25 C (77 F): Days with min20119196950
10 mm (0.39 in): Days with 10 mm or more rain2855195250
25 mm (0.98 in): Days with 25 mm or more rain2823195214
50 mm (1.97 in): Days with 50 mm or more rain27719563
100 mm (3.94 in): Days with 100 mm or more rain8119181

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 City 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).