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Built 2026-10-19 (19 October 2026)

Puerto Rico Threshold Days by Year (MXN00028192)

16 fixed thresholds counted per year at Puerto Rico (MXN00028192): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Puerto Rico Thresholds

  • Puerto Rico: days with a maximum temperature at or above 30 C (86 F) in 27 years, most in 1999 with 264.
  • Puerto Rico: days with a maximum temperature at or above 35 C (95 F) in 27 years, most in 1982 with 164.
  • Puerto Rico: days with a maximum temperature at or above 40 C (104 F) in 27 years, most in 2009 with 93.
  • Puerto Rico: days with a maximum temperature at or above 90 F (32.2 C) in 27 years, most in 1989 with 200.
  • 16 fixed thresholds have at least one qualifying day at Puerto Rico.
27 years with a qualifying day
Days at or above 30 C (86 F) per year at Puerto Rico Days per year at Puerto Rico with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 264 in 1999. 01002003001981: 2321982: 2531983: 2361984: 2251985: 2431986: 2471987: 2301988: 2451989: 2611990: 2571991: 2511992: 2261993: 2191994: 2251995: 2501996: 2131997: 1771998: 2381999: 2642000: 2462001: 2282003: 2362005: 2482006: 2612007: 2222008: 2622009: 261198119841987199019931996199920032007
Days per year at Puerto Rico with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 264 in 1999.
Days at or above 30 C (86 F) per year at Puerto Rico
YearDaysDecade average
1981232241.3
1982253241.3
1983236241.3
1984225241.3
1985243241.3
1986247241.3
1987230241.3
1988245241.3
1989261241.3
1990257232
1991251232
1992226232
1993219232
1994225232
1995250232
1996213232
1997177232
1998238232
1999264232
2000246245.5
2001228245.5
2003236245.5
2005248245.5
2006261245.5
2007222245.5
2008262245.5
2009261245.5
First to last qualifying date each year at Puerto Rico For each year, a bar from the first to the last day at Puerto Rico meeting 30 C (86 F). 1981: 31 January 1981 to 28 December 19811982: 2 January 1982 to 24 December 19821983: 29 January 1983 to 22 December 19831984: 9 January 1984 to 23 December 19841985: 29 January 1985 to 1 December 19851986: 8 January 1986 to 24 November 19861987: 29 January 1987 to 26 December 19871988: 17 January 1988 to 27 December 19881989: 2 January 1989 to 29 November 19891990: 9 January 1990 to 30 December 19901991: 14 January 1991 to 12 December 19911992: 4 February 1992 to 31 December 19921993: 9 February 1993 to 17 December 19931994: 9 February 1994 to 15 December 19941995: 11 January 1995 to 5 December 19951996: 23 January 1996 to 14 December 19961997: 2 January 1997 to 1 November 19971998: 5 January 1998 to 30 December 19981999: 12 January 1999 to 11 December 19992000: 1 January 2000 to 30 December 20002001: 16 January 2001 to 29 December 20012003: 22 January 2003 to 8 December 20032005: 1 January 2005 to 29 December 20052006: 2 January 2006 to 15 December 20062007: 6 January 2007 to 22 December 20072008: 6 January 2008 to 28 December 20082009: 18 January 2009 to 7 December 20091981198519891993199720012007JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Puerto Rico meeting 30 C (86 F).
First to last qualifying date each year at Puerto Rico
YearFirst dateLast date
19811981-01-311981-12-28
19821982-01-021982-12-24
19831983-01-291983-12-22
19841984-01-091984-12-23
19851985-01-291985-12-01
19861986-01-081986-11-24
19871987-01-291987-12-26
19881988-01-171988-12-27
19891989-01-021989-11-29
19901990-01-091990-12-30
19911991-01-141991-12-12
19921992-02-041992-12-31
19931993-02-091993-12-17
19941994-02-091994-12-15
19951995-01-111995-12-05
19961996-01-231996-12-14
19971997-01-021997-11-01
19981998-01-051998-12-30
19991999-01-121999-12-11
20002000-01-012000-12-30
20012001-01-162001-12-29
20032003-01-222003-12-08
20052005-01-012005-12-29
20062006-01-022006-12-15
20072007-01-062007-12-22
20082008-01-062008-12-28
20092009-01-182009-12-07

Every Fixed Threshold

Fixed thresholds at Puerto Rico
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days272641999261
35 C (95 F): Days271641982154
40 C (104 F): Days2793200993
45 C (113 F): Days8219951
90 F (32.2 C): Days272001989193
100 F (37.8 C): Days271132009113
110 F (43.3 C): Days11519911
120 F (48.9 C): Days1120001
0 C (32 F): Frost days (min11719891
20 C (68 F): Tropical nights (min271891981188
25 C (77 F): Days with min2540200940
10 mm (0.39 in): Days with 10 mm or more rain2629200319
25 mm (0.98 in): Days with 25 mm or more rain251220037
50 mm (1.97 in): Days with 50 mm or more rain23620034
100 mm (3.94 in): Days with 100 mm or more rain6119811
200 mm (7.87 in): Days with 200 mm or more rain1119961

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1981.

Download the Data

  • Data for Puerto Rico 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).