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Arecibo Obsy Weather Records (RQC00660426)

Record envelope, standing records and threshold days for Arecibo Obsy (RQC00660426), PR, Puerto Rico [United States], with 47 years of record.

Key Facts for Arecibo Obsy

  • Arecibo Obsy (RQC00660426) is a weather station in PR, Puerto Rico [United States] at 18.35 latitude and -66.75 longitude, 323 m (1,060 ft) above sea level.
  • The station reports from 1980 to 2026, 47 years of record.
  • 1,464 records set at Arecibo Obsy still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Arecibo Obsy set a daily record high maximum temperature of 33.3 C (91.9 F) on 20 September 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: PR, Puerto Rico [United States], 18.35 latitude, -66.75 longitude.
  • Elevation: 323 m (1,060 ft).
  • Period of record: 1980 to 2026, 47 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

7 days at or beyond a record
Daily record high and record low at Arecibo Obsy, with 2026 drawn through them The band shows the record high and record low for each calendar day at Arecibo Obsy. The lines show the 2026 daily maximum and minimum. 7 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 010203040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Arecibo Obsy. The lines show the 2026 daily maximum and minimum. 7 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Arecibo Obsy, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan33.9 C (93.0 F)7.2 C (45.0 F)29.4 C (84.9 F)15.0 C (59.0 F)
Feb34.4 C (93.9 F)8.9 C (48.0 F)30.6 C (87.1 F)14.4 C (57.9 F)
Mar34.4 C (93.9 F)8.3 C (46.9 F)31.1 C (88.0 F)15.0 C (59.0 F)
Apr33.9 C (93.0 F)8.3 C (46.9 F)n/an/a
May34.4 C (93.9 F)10.6 C (51.1 F)32.8 C (91.0 F)18.9 C (66.0 F)
Jun36.1 C (97.0 F)12.2 C (54.0 F)33.9 C (93.0 F)18.9 C (66.0 F)
Jul36.1 C (97.0 F)11.1 C (52.0 F)35.0 C (95.0 F)19.4 C (66.9 F)
Aug35.0 C (95.0 F)10.0 C (50.0 F)34.4 C (93.9 F)20.0 C (68.0 F)
Sep35.0 C (95.0 F)11.7 C (53.1 F)33.3 C (91.9 F)20.0 C (68.0 F)
Oct35.6 C (96.1 F)10.0 C (50.0 F)31.7 C (89.1 F)20.0 C (68.0 F)
Nov33.9 C (93.0 F)12.2 C (54.0 F)n/an/a
Dec33.3 C (91.9 F)8.3 C (46.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Arecibo Obsy by the year they were set 1,464 records at Arecibo Obsy still stand. 1996 holds the most, with 182. 0501001502001980: 281981: 281982: 201983: 271984: 281985: 71986: 151987: 461988: 371989: 211990: 401991: 341992: 291993: 241994: 411995: 381996: 1821997: 1021998: 361999: 192000: 182001: 342002: 382003: 362004: 252005: 572006: 302007: 252008: 292009: 232010: 712011: 272012: 192013: 202014: 82015: 132016: 52017: 32018: 152019: 212020: 142021: 102022: 222023: 572024: 302025: 82026: 41980198519901995200020052010201520202025
1,464 records at Arecibo Obsy still stand. 1996 holds the most, with 182.
Standing records at Arecibo Obsy by the year they were set
Year setStanding records
198028
198128
198220
198327
198428
19857
198615
198746
198837
198921
199040
199134
199229
199324
199441
199538
1996182
1997102
199836
199919
200018
200134
200238
200336
200425
200557
200630
200725
200829
200923
201071
201127
201219
201320
20148
201513
20165
20173
201815
201921
202014
202110
202222
202357
202430
20258
20264

Wettest Day of Each Month

Oct: 198.1 mm (7.8 in)
Record daily precipitation for each month at Arecibo Obsy The wettest day on record for each calendar month at Arecibo Obsy. The most was 198.1 mm (7.8 in) on 7 October 1985. 050100150200 Jan: 113.0 mm (4.4 in), 20 January 2005 Jan Feb: 84.6 mm (3.3 in), 26 February 1999 Feb Mar: 165.1 mm (6.5 in), 29 March 2012 Mar Apr: 151.9 mm (6.0 in), 20 April 2025 Apr May: 146.1 mm (5.8 in), 28 May 1995 May Jun: 121.4 mm (4.8 in), 5 June 2011 Jun Jul: 161.3 mm (6.4 in), 15 July 1990 Jul Aug: 193.0 mm (7.6 in), 3 August 2014 Aug Sep: 144.8 mm (5.7 in), 9 September 1996 Sep Oct: 198.1 mm (7.8 in), 7 October 1985 Oct Nov: 166.4 mm (6.6 in), 8 November 2011 Nov Dec: 146.1 mm (5.8 in), 14 December 1981 Dec
The wettest day on record for each calendar month at Arecibo Obsy. The most was 198.1 mm (7.8 in) on 7 October 1985.
Record daily precipitation for each month at Arecibo Obsy
MonthRecord daily precipitation (mm)Date
Jan113.0 mm (4.4 in)20 January 2005
Feb84.6 mm (3.3 in)26 February 1999
Mar165.1 mm (6.5 in)29 March 2012
Apr151.9 mm (6.0 in)20 April 2025
May146.1 mm (5.8 in)28 May 1995
Jun121.4 mm (4.8 in)5 June 2011
Jul161.3 mm (6.4 in)15 July 1990
Aug193.0 mm (7.6 in)3 August 2014
Sep144.8 mm (5.7 in)9 September 1996
Oct198.1 mm (7.8 in)7 October 1985
Nov166.4 mm (6.6 in)8 November 2011
Dec146.1 mm (5.8 in)14 December 1981

Period of Record Coverage

1980 to 2026
Days with data per year at Arecibo Obsy 47 years of record at Arecibo Obsy, 1980 to 2026. 11 years have data for under 90 percent of days and are left out of rankings: 1992, 1993, 1995, 2012, 2013, 2015, 2016, 2017 and others. 1980: 335 of 366 days1981: 365 of 365 days1982: 365 of 365 days1983: 364 of 365 days1984: 366 of 366 days1985: 334 of 365 days1986: 334 of 365 days1987: 365 of 365 days1988: 366 of 366 days1989: 364 of 365 days1990: 365 of 365 days1991: 364 of 365 days1992: 305 of 366 days1993: 242 of 365 days1994: 365 of 365 days1995: 307 of 365 days1996: 365 of 366 days1997: 365 of 365 days1998: 363 of 365 days1999: 364 of 365 days2000: 335 of 366 days2001: 365 of 365 days2002: 365 of 365 days2003: 364 of 365 days2004: 366 of 366 days2005: 364 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 346 of 366 days2009: 340 of 365 days2010: 364 of 365 days2011: 353 of 365 days2012: 328 of 366 days2013: 310 of 365 days2014: 331 of 365 days2015: 211 of 365 days2016: 304 of 366 days2017: 236 of 365 days2018: 271 of 365 days2019: 301 of 365 days2020: 351 of 366 days2021: 355 of 365 days2022: 357 of 365 days2023: 349 of 365 days2024: 352 of 366 days2025: 346 of 365 days2026: 202 of 365 days19801990200020102020
47 years of record at Arecibo Obsy, 1980 to 2026. 11 years have data for under 90 percent of days and are left out of rankings: 1992, 1993, 1995, 2012, 2013, 2015, 2016, 2017 and others.
Days with data per year at Arecibo Obsy
YearDays with dataShare of yearComplete
198033592%Yes
1981365100%Yes
1982365100%Yes
1983364100%Yes
1984366100%Yes
198533492%Yes
198633492%Yes
1987365100%Yes
1988366100%Yes
1989364100%Yes
1990365100%Yes
1991364100%Yes
199230583%No
199324266%No
1994365100%Yes
199530784%No
1996365100%Yes
1997365100%Yes
199836399%Yes
1999364100%Yes
200033592%Yes
2001365100%Yes
2002365100%Yes
2003364100%Yes
2004366100%Yes
2005364100%Yes
2006365100%Yes
2007365100%Yes
200834695%Yes
200934093%Yes
2010364100%Yes
201135397%Yes
201232890%No
201331085%No
201433191%Yes
201521158%No
201630483%No
201723665%No
201827174%No
201930182%No
202035196%Yes
202135597%Yes
202235798%Yes
202334996%Yes
202435296%Yes
202534695%Yes
202620255%No

Latest Records

20
Latest records at Arecibo Obsy
DateStationRecordValueBeat old record byOld record stoodSignificance
20 September 2026Arecibo Obsy, PRdaily high max (Provisional)33.3 C (91.9 F)1.1 C (2.0 F)32 years19 of 100 (Routine)
19 September 2026Arecibo Obsy, PRdaily high max (Provisional)33.3 C (91.9 F)0.5 C (0.9 F)31 years15 of 100 (Routine)
9 September 2026Arecibo Obsy, PRdaily high min (Tie, Provisional)21.7 C (71.1 F)tie28 years3 of 100 (Routine)
7 September 2026Arecibo Obsy, PRdaily high min (Tie, Provisional)22.2 C (72.0 F)tie20 years2 of 100 (Routine)
30 August 2026Arecibo Obsy, PRdaily high min (Tie, Provisional)22.2 C (72.0 F)tie16 years2 of 100 (Routine)
29 August 2026Arecibo Obsy, PRdaily high min (Tie, Provisional)22.2 C (72.0 F)tie4 years1 of 100 (Routine)
28 August 2026Arecibo Obsy, PRdaily high min (Tie, Provisional)22.2 C (72.0 F)tie3 years1 of 100 (Routine)
16 August 2026Arecibo Obsy, PRall-time high min (Tie, Provisional)23.9 C (75.0 F)tie35 years8 of 100 (Routine)
15 August 2026Arecibo Obsy, PRdaily high max34.4 C (93.9 F)1.1 C (2.0 F)45 years23 of 100 (Routine)
12 August 2026Arecibo Obsy, PRdaily high min (Tie)22.2 C (72.0 F)tie20 years2 of 100 (Routine)
10 August 2026Arecibo Obsy, PRdaily high min (Tie)22.2 C (72.0 F)tie25 years2 of 100 (Routine)
31 July 2026Arecibo Obsy, PRdaily high max34.4 C (93.9 F)1.1 C (2.0 F)31 years19 of 100 (Routine)
30 July 2026Arecibo Obsy, PRdaily high max35.0 C (95.0 F)2.2 C (4.0 F)33 years27 of 100 (Routine)
13 July 2026Arecibo Obsy, PRdaily high min (Tie)22.2 C (72.0 F)tie16 years2 of 100 (Routine)
12 July 2026Arecibo Obsy, PRdaily high min (Tie)21.7 C (71.1 F)tie28 years3 of 100 (Routine)
10 July 2026Arecibo Obsy, PRdaily high min (Tie)21.7 C (71.1 F)tie28 years3 of 100 (Routine)
20 June 2026Arecibo Obsy, PRdaily high min21.7 C (71.1 F)0.6 C (1.1 F)28 years15 of 100 (Routine)
12 June 2026Arecibo Obsy, PRdaily high min (Tie)20.6 C (69.1 F)tie37 years3 of 100 (Routine)
20 May 2026Arecibo Obsy, PRdaily high max (Tie)32.8 C (91.0 F)tie36 years3 of 100 (Routine)
17 May 2026Arecibo Obsy, PRdaily high max (Tie)32.8 C (91.0 F)tie4 years1 of 100 (Routine)

Climate Trend

28 complete years, 1981 to 2024
Annual mean temperature at Arecibo Obsy as warming stripes, 1981 to 2024 One stripe for each of 28 complete years at Arecibo Obsy, 1981 to 2024. Blue stripes are years cooler than the station's own mean of 23.8 C (74.8 F); red stripes are warmer. The coolest year was 1996, at 21.8 C (71.2 F), and the warmest was 2024, at 24.8 C (76.6 F). The strongest colour marks a difference of 2.0 C (3.6 F). 1981: 23.9 C, +0.1 C from the station mean1982: 23.6 C, -0.2 C from the station mean1983: 23.8 C, +0.1 C from the station mean1984: 23.1 C, -0.7 C from the station mean1987: 24.1 C, +0.4 C from the station mean1988: 23.3 C, -0.5 C from the station mean1989: 23.3 C, -0.5 C from the station mean1990: 23.6 C, -0.2 C from the station mean1991: 23.6 C, -0.2 C from the station mean1994: 23.2 C, -0.6 C from the station mean1996: 21.8 C, -2.0 C from the station mean1997: 23.5 C, -0.3 C from the station mean1998: 24.3 C, +0.5 C from the station mean1999: 23.7 C, -0.1 C from the station mean2001: 24.0 C, +0.3 C from the station mean2002: 24.3 C, +0.5 C from the station mean2003: 24.4 C, +0.7 C from the station mean2004: 23.9 C, +0.1 C from the station mean2005: 24.2 C, +0.4 C from the station mean2006: 24.3 C, +0.5 C from the station mean2007: 24.3 C, +0.5 C from the station mean2010: 23.7 C, 0.0 C from the station mean2011: 23.1 C, -0.7 C from the station mean2020: 24.0 C, +0.2 C from the station mean2021: 23.9 C, +0.1 C from the station mean2022: 23.7 C, -0.1 C from the station mean2023: 24.6 C, +0.8 C from the station mean2024: 24.8 C, +1.0 C from the station mean198119851990199520002005201020152020
One stripe for each of 28 complete years at Arecibo Obsy, 1981 to 2024. Blue stripes are years cooler than the station's own mean of 23.8 C (74.8 F); red stripes are warmer. The coolest year was 1996, at 21.8 C (71.2 F), and the warmest was 2024, at 24.8 C (76.6 F). The strongest colour marks a difference of 2.0 C (3.6 F).
Annual mean temperature at Arecibo Obsy as warming stripes, 1981 to 2024
YearAnnual mean temperatureDifference from the station mean
198123.9 C+0.09 C
198223.6 C-0.19 C
198323.8 C+0.06 C
198423.1 C-0.71 C
198724.1 C+0.36 C
198823.3 C-0.52 C
198923.3 C-0.52 C
199023.6 C-0.20 C
199123.6 C-0.22 C
199423.2 C-0.59 C
199621.8 C-1.99 C
199723.5 C-0.33 C
199824.3 C+0.47 C
199923.7 C-0.11 C
200124.0 C+0.26 C
200224.3 C+0.48 C
200324.4 C+0.65 C
200423.9 C+0.14 C
200524.2 C+0.43 C
200624.3 C+0.47 C
200724.3 C+0.52 C
201023.7 C-0.04 C
201123.1 C-0.66 C
202024.0 C+0.23 C
202123.9 C+0.12 C
202223.7 C-0.13 C
202324.6 C+0.83 C
202424.8 C+0.99 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1980 to 2026
Yearly extremes at Arecibo Obsy: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)36.1 C (97.0 F)199833.9 C (93.0 F)47
Coldest night (TNn)7.2 C (45.0 F)199912.8 C (55.0 F)47
Wettest day (Rx1day)198.1 mm (7.8 in)1985106.7 mm (4.2 in)47
Wettest five days (Rx5day)287.8 mm (11.3 in)1981188.9 mm (7.4 in)47
Longest dry spell (CDD)36 days198315 days47

Hottest day (TXx)

Hottest day (TXx) at Arecibo Obsy by year The hottest day of the year at Arecibo Obsy, 1980 to 2026. The record is 36.1 C (97.0 F) in 1998, marked on the chart; the median year is 33.9 C (93.0 F). 32333435363719801990200020102020Record: 36.1 C (97.0 F) in 1998
The hottest day of the year at Arecibo Obsy, 1980 to 2026. The record is 36.1 C (97.0 F) in 1998, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Arecibo Obsy by year
YearHottest day (TXx)
198033.9 C (93.0 F)
198134.4 C (93.9 F)
198234.4 C (93.9 F)
198333.9 C (93.0 F)
198433.3 C (91.9 F)
198533.3 C (91.9 F)
198633.3 C (91.9 F)
198734.4 C (93.9 F)
198833.9 C (93.0 F)
198933.3 C (91.9 F)
199034.4 C (93.9 F)
199133.9 C (93.0 F)
199234.4 C (93.9 F)
199334.4 C (93.9 F)
199435.6 C (96.1 F)
199535.0 C (95.0 F)
199635.0 C (95.0 F)
199734.4 C (93.9 F)
199836.1 C (97.0 F)
199932.8 C (91.0 F)
200033.9 C (93.0 F)
200134.4 C (93.9 F)
200233.9 C (93.0 F)
200333.9 C (93.0 F)
200435.0 C (95.0 F)
200533.3 C (91.9 F)
200633.9 C (93.0 F)
200735.0 C (95.0 F)
200835.6 C (96.1 F)
200933.3 C (91.9 F)
201033.3 C (91.9 F)
201133.3 C (91.9 F)
201236.1 C (97.0 F)
201333.9 C (93.0 F)
201433.3 C (91.9 F)
201533.9 C (93.0 F)
201633.3 C (91.9 F)
201732.8 C (91.0 F)
201832.8 C (91.0 F)
201933.9 C (93.0 F)
202033.3 C (91.9 F)
202133.3 C (91.9 F)
202233.3 C (91.9 F)
202335.0 C (95.0 F)
202434.4 C (93.9 F)
202534.4 C (93.9 F)
202635.0 C (95.0 F)

Coldest night (TNn)

Coldest night (TNn) at Arecibo Obsy by year The coldest night of the year at Arecibo Obsy, 1980 to 2026. The record is 7.2 C (45.0 F) in 1999, marked on the chart; the median year is 12.8 C (55.0 F). 57.51012.51517.519801990200020102020Record: 7.2 C (45.0 F) in 1999
The coldest night of the year at Arecibo Obsy, 1980 to 2026. The record is 7.2 C (45.0 F) in 1999, marked on the chart; the median year is 12.8 C (55.0 F).
Coldest night (TNn) at Arecibo Obsy by year
YearColdest night (TNn)
198012.8 C (55.0 F)
198113.3 C (55.9 F)
198214.4 C (57.9 F)
198312.8 C (55.0 F)
198412.8 C (55.0 F)
198511.1 C (52.0 F)
198613.9 C (57.0 F)
198712.2 C (54.0 F)
198810.0 C (50.0 F)
198911.1 C (52.0 F)
199010.6 C (51.1 F)
19918.3 C (46.9 F)
199210.6 C (51.1 F)
199311.7 C (53.1 F)
199411.1 C (52.0 F)
19959.4 C (48.9 F)
19969.4 C (48.9 F)
19978.3 C (46.9 F)
199812.2 C (54.0 F)
19997.2 C (45.0 F)
200011.1 C (52.0 F)
200111.7 C (53.1 F)
20028.9 C (48.0 F)
200314.4 C (57.9 F)
200415.0 C (59.0 F)
200514.4 C (57.9 F)
200615.0 C (59.0 F)
200715.6 C (60.1 F)
200815.0 C (59.0 F)
200913.9 C (57.0 F)
201012.8 C (55.0 F)
201110.0 C (50.0 F)
201215.0 C (59.0 F)
201312.2 C (54.0 F)
201410.0 C (50.0 F)
201511.7 C (53.1 F)
201613.9 C (57.0 F)
201713.9 C (57.0 F)
201813.9 C (57.0 F)
201911.1 C (52.0 F)
202015.0 C (59.0 F)
202115.6 C (60.1 F)
202215.0 C (59.0 F)
202314.4 C (57.9 F)
202415.0 C (59.0 F)
202514.4 C (57.9 F)
202614.4 C (57.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Arecibo Obsy by year The wettest day of the year at Arecibo Obsy, 1980 to 2026. The record is 198.1 mm (7.8 in) in 1985, marked on the chart; the median year is 106.7 mm (4.2 in). 5010015020019801990200020102020Record: 198.1 mm (7.8 in) in 1985
The wettest day of the year at Arecibo Obsy, 1980 to 2026. The record is 198.1 mm (7.8 in) in 1985, marked on the chart; the median year is 106.7 mm (4.2 in).
Wettest day (Rx1day) at Arecibo Obsy by year
YearWettest day (Rx1day)
1980118.4 mm (4.7 in)
1981146.1 mm (5.8 in)
1982100.8 mm (4.0 in)
198376.2 mm (3.0 in)
198475.4 mm (3.0 in)
1985198.1 mm (7.8 in)
198692.7 mm (3.6 in)
1987150.4 mm (5.9 in)
1988125.7 mm (4.9 in)
1989111.8 mm (4.4 in)
1990161.3 mm (6.4 in)
1991105.4 mm (4.1 in)
1992106.7 mm (4.2 in)
199395.3 mm (3.8 in)
199492.7 mm (3.6 in)
1995146.1 mm (5.8 in)
1996144.8 mm (5.7 in)
1997111.8 mm (4.4 in)
199883.1 mm (3.3 in)
1999116.8 mm (4.6 in)
200074.9 mm (2.9 in)
2001109.2 mm (4.3 in)
200279.5 mm (3.1 in)
200383.8 mm (3.3 in)
2004123.2 mm (4.9 in)
2005113.0 mm (4.4 in)
200688.9 mm (3.5 in)
200769.3 mm (2.7 in)
2008127.0 mm (5.0 in)
200960.2 mm (2.4 in)
2010129.3 mm (5.1 in)
2011166.4 mm (6.6 in)
2012165.1 mm (6.5 in)
2013101.6 mm (4.0 in)
2014193.0 mm (7.6 in)
2015142.0 mm (5.6 in)
201674.9 mm (2.9 in)
2017139.7 mm (5.5 in)
2018101.6 mm (4.0 in)
201968.3 mm (2.7 in)
202066.0 mm (2.6 in)
2021126.7 mm (5.0 in)
202275.9 mm (3.0 in)
2023101.6 mm (4.0 in)
202495.3 mm (3.8 in)
2025151.9 mm (6.0 in)
202653.3 mm (2.1 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Arecibo Obsy by year The wettest five days of the year at Arecibo Obsy, 1980 to 2026. The record is 287.8 mm (11.3 in) in 1981, marked on the chart; the median year is 188.9 mm (7.4 in). 10015020025030019801990200020102020Record: 287.8 mm (11.3 in) in 1981
The wettest five days of the year at Arecibo Obsy, 1980 to 2026. The record is 287.8 mm (11.3 in) in 1981, marked on the chart; the median year is 188.9 mm (7.4 in).
Wettest five days (Rx5day) at Arecibo Obsy by year
YearWettest five days (Rx5day)
1980188.3 mm (7.4 in)
1981287.8 mm (11.3 in)
1982179.8 mm (7.1 in)
1983144.2 mm (5.7 in)
1984172.4 mm (6.8 in)
1985254.5 mm (10.0 in)
1986192.3 mm (7.6 in)
1987234.2 mm (9.2 in)
1988198.9 mm (7.8 in)
1989223.3 mm (8.8 in)
1990231.4 mm (9.1 in)
1991151.1 mm (5.9 in)
1992140.8 mm (5.5 in)
1993143.0 mm (5.6 in)
1994133.1 mm (5.2 in)
1995282.5 mm (11.1 in)
1996198.7 mm (7.8 in)
1997205.3 mm (8.1 in)
1998135.2 mm (5.3 in)
1999158.8 mm (6.3 in)
2000114.8 mm (4.5 in)
2001212.8 mm (8.4 in)
2002181.3 mm (7.1 in)
2003151.7 mm (6.0 in)
2004203.6 mm (8.0 in)
2005239.8 mm (9.4 in)
2006129.8 mm (5.1 in)
2007149.1 mm (5.9 in)
2008278.5 mm (11.0 in)
2009153.3 mm (6.0 in)
2010188.9 mm (7.4 in)
2011222.7 mm (8.8 in)
2012234.0 mm (9.2 in)
2013190.2 mm (7.5 in)
2014272.5 mm (10.7 in)
2015179.4 mm (7.1 in)
2016171.9 mm (6.8 in)
2017196.0 mm (7.7 in)
2018213.9 mm (8.4 in)
2019136.3 mm (5.4 in)
2020207.0 mm (8.1 in)
2021222.2 mm (8.7 in)
2022140.2 mm (5.5 in)
2023119.3 mm (4.7 in)
2024204.0 mm (8.0 in)
2025180.1 mm (7.1 in)
2026135.2 mm (5.3 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Arecibo Obsy by year The longest dry spell of the year at Arecibo Obsy, 1980 to 2026. The record is 36 days in 1983, marked on the chart; the median year is 15 days. 01020304019801990200020102020Record: 36 days in 1983
The longest dry spell of the year at Arecibo Obsy, 1980 to 2026. The record is 36 days in 1983, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Arecibo Obsy by year
YearLongest dry spell (CDD)
198014 days
198111 days
198214 days
198336 days
198419 days
198515 days
198616 days
198713 days
198812 days
198922 days
199010 days
199120 days
199216 days
199316 days
199411 days
199519 days
199610 days
199722 days
199814 days
199913 days
200023 days
200118 days
200211 days
200326 days
200410 days
200523 days
200616 days
200716 days
200814 days
200914 days
201023 days
201115 days
201219 days
201311 days
201415 days
201519 days
20169 days
20179 days
201814 days
20199 days
202016 days
20218 days
202219 days
202314 days
202421 days
202513 days
20269 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Rainfall Return Levels

39 years, 1980 to 2025

A day with at least 108.6 mm (4.3 in) of rain is expected about once in 2 years. A day with at least 221.6 mm (8.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Arecibo Obsy: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years108.6 mm (4.3 in)
5 years141.4 mm (5.6 in)
10 years162.0 mm (6.4 in)
25 years187.0 mm (7.4 in)
50 years204.7 mm (8.1 in)Longer than the 39 years of record
100 years221.6 mm (8.7 in)Longer than the 39 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 39 years of values from 1980 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 198.1 mm (7.8 in) in 1985; 193.0 mm (7.6 in) in 2014; 166.4 mm (6.6 in) in 2011.

Download the Data

  • Data for Arecibo Obsy standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Arecibo Obsy 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).