Daily records
Page built 2026-10-17
Data as of 2025-12-31
Search
Built 2026-10-17 (17 October 2026)

Acapulco KM. 21 Weather Records (MXN00012172)

Record envelope, standing records and threshold days for Acapulco KM. 21 (MXN00012172), Mexico, with 43 years of record.

Key Facts for Acapulco KM. 21

  • Acapulco KM. 21 (MXN00012172) is a weather station in Mexico at 16.95 latitude and -99.68 longitude, 207 m (679 ft) above sea level.
  • The station reports from 1971 to 2013, 43 years of record.
  • 1,464 records set at Acapulco KM. 21 still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Acapulco KM. 21 set a daily record precipitation of 9.9 mm (0.39 in) on 14 March 2013.

About the Station

  • Location: Mexico, 16.95 latitude, -99.68 longitude.
  • Elevation: 207 m (679 ft).
  • Period of record: 1971 to 2013, 43 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Acapulco KM. 21, with 2026 drawn through them The band shows the record high and record low for each calendar day at Acapulco KM. 21. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 1020304050 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Acapulco KM. 21. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Acapulco KM. 21, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan40.6 C (105.1 F)10.0 C (50.0 F)n/an/a
Feb40.0 C (104.0 F)11.1 C (52.0 F)n/an/a
Mar40.0 C (104.0 F)11.7 C (53.1 F)n/an/a
Apr41.1 C (106.0 F)13.9 C (57.0 F)n/an/a
May41.7 C (107.1 F)13.9 C (57.0 F)n/an/a
Jun41.7 C (107.1 F)16.7 C (62.1 F)n/an/a
Jul40.0 C (104.0 F)18.9 C (66.0 F)n/an/a
Aug40.0 C (104.0 F)17.8 C (64.0 F)n/an/a
Sep40.0 C (104.0 F)17.8 C (64.0 F)n/an/a
Oct40.0 C (104.0 F)16.1 C (61.0 F)n/an/a
Nov39.4 C (102.9 F)11.7 C (53.1 F)n/an/a
Dec41.7 C (107.1 F)12.8 C (55.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Acapulco KM. 21 by the year they were set 1,464 records at Acapulco KM. 21 still stand. 1995 holds the most, with 183. 0501001502001971: 361972: 1351973: 761974: 711975: 431976: 691977: 611978: 501979: 591980: 251981: 221982: 171983: 271984: 171985: 31986: 201987: 221988: 261989: 101990: 41991: 291993: 781994: 1131995: 1831996: 481997: 211998: 221999: 222000: 102001: 182002: 102003: 22006: 72007: 212008: 342009: 172010: 282012: 81971197519791983198719911996200020062010
1,464 records at Acapulco KM. 21 still stand. 1995 holds the most, with 183.
Standing records at Acapulco KM. 21 by the year they were set
Year setStanding records
197136
1972135
197376
197471
197543
197669
197761
197850
197959
198025
198122
198217
198327
198417
19853
198620
198722
198826
198910
19904
199129
199378
1994113
1995183
199648
199721
199822
199922
200010
200118
200210
20032
20067
200721
200834
200917
201028
20128

Wettest Day of Each Month

Aug: 231.9 mm (9.1 in)
Record daily precipitation for each month at Acapulco KM. 21 The wettest day on record for each calendar month at Acapulco KM. 21. The most was 231.9 mm (9.1 in) on 27 August 1981. 0100200300 Jan: 70.4 mm (2.8 in), 15 January 2010 Jan Feb: 151.1 mm (5.9 in), 3 February 2010 Feb Mar: 42.2 mm (1.7 in), 2 March 2001 Mar Apr: 21.8 mm (0.9 in), 5 April 1973 Apr May: 163.6 mm (6.4 in), 30 May 1978 May Jun: 192.0 mm (7.6 in), 22 June 2009 Jun Jul: 149.9 mm (5.9 in), 9 July 2009 Jul Aug: 231.9 mm (9.1 in), 27 August 1981 Aug Sep: 211.3 mm (8.3 in), 21 September 1974 Sep Oct: 217.9 mm (8.6 in), 8 October 1997 Oct Nov: 160.0 mm (6.3 in), 3 November 2002 Nov Dec: 29.5 mm (1.2 in), 17 December 1997 Dec
The wettest day on record for each calendar month at Acapulco KM. 21. The most was 231.9 mm (9.1 in) on 27 August 1981.
Record daily precipitation for each month at Acapulco KM. 21
MonthRecord daily precipitation (mm)Date
Jan70.4 mm (2.8 in)15 January 2010
Feb151.1 mm (5.9 in)3 February 2010
Mar42.2 mm (1.7 in)2 March 2001
Apr21.8 mm (0.9 in)5 April 1973
May163.6 mm (6.4 in)30 May 1978
Jun192.0 mm (7.6 in)22 June 2009
Jul149.9 mm (5.9 in)9 July 2009
Aug231.9 mm (9.1 in)27 August 1981
Sep211.3 mm (8.3 in)21 September 1974
Oct217.9 mm (8.6 in)8 October 1997
Nov160.0 mm (6.3 in)3 November 2002
Dec29.5 mm (1.2 in)17 December 1997

Period of Record Coverage

1971 to 2013
Days with data per year at Acapulco KM. 21 39 years of record at Acapulco KM. 21, 1971 to 2013. 7 years have data for under 90 percent of days and are left out of rankings: 1971, 1991, 2000, 2003, 2006, 2012, 2013. 1971: 184 of 365 days1972: 366 of 366 days1973: 365 of 365 days1974: 365 of 365 days1975: 334 of 365 days1976: 355 of 366 days1977: 354 of 365 days1978: 350 of 365 days1979: 365 of 365 days1980: 366 of 366 days1981: 365 of 365 days1982: 365 of 365 days1983: 365 of 365 days1984: 366 of 366 days1985: 365 of 365 days1986: 365 of 365 days1987: 365 of 365 days1988: 345 of 366 days1989: 365 of 365 days1990: 365 of 365 days1991: 193 of 365 days1993: 365 of 365 days1994: 365 of 365 days1995: 365 of 365 days1996: 366 of 366 days1997: 365 of 365 days1998: 365 of 365 days1999: 334 of 365 days2000: 295 of 366 days2001: 342 of 365 days2002: 334 of 365 days2003: 43 of 365 days2006: 87 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 363 of 365 days2010: 334 of 365 days2012: 196 of 366 days2013: 72 of 365 days1975198019851990199520002010
39 years of record at Acapulco KM. 21, 1971 to 2013. 7 years have data for under 90 percent of days and are left out of rankings: 1971, 1991, 2000, 2003, 2006, 2012, 2013.
Days with data per year at Acapulco KM. 21
YearDays with dataShare of yearComplete
197118450%No
1972366100%Yes
1973365100%Yes
1974365100%Yes
197533492%Yes
197635597%Yes
197735497%Yes
197835096%Yes
1979365100%Yes
1980366100%Yes
1981365100%Yes
1982365100%Yes
1983365100%Yes
1984366100%Yes
1985365100%Yes
1986365100%Yes
1987365100%Yes
198834594%Yes
1989365100%Yes
1990365100%Yes
199119353%No
1993365100%Yes
1994365100%Yes
1995365100%Yes
1996366100%Yes
1997365100%Yes
1998365100%Yes
199933492%Yes
200029581%No
200134294%Yes
200233492%Yes
20034312%No
20068724%No
2007365100%Yes
2008366100%Yes
200936399%Yes
201033492%Yes
201219654%No
20137220%No

Latest Records

20
Latest records at Acapulco KM. 21
DateStationRecordValueBeat old record byOld record stoodSignificance
14 March 2013Acapulco KM. 21, MXdaily rain9.9 mm (0.39 in)9.9 mm (0.39 in)40 years20 of 100 (Routine)
20 January 2013Acapulco KM. 21, MXdaily rain1.8 mm (0.07 in)1.8 mm (0.07 in)41 years17 of 100 (Routine)
30 October 2012Acapulco KM. 21, MXdaily rain28.4 mm (1.1 in)26.1 mm (1.0 in)33 years21 of 100 (Routine)
20 October 2012Acapulco KM. 21, MXdaily rain16.3 mm (0.6 in)1.6 mm (0.06 in)38 years15 of 100 (Routine)
10 July 2012Acapulco KM. 21, MXdaily rain104.9 mm (4.1 in)62.7 mm (2.5 in)21 years36 of 100 (Notable)
8 July 2012Acapulco KM. 21, MXdaily rain54.9 mm (2.2 in)5.6 mm (0.22 in)28 years14 of 100 (Routine)
27 June 2012Acapulco KM. 21, MXdaily low min (Tie)20.0 C (68.0 F)tie35 years3 of 100 (Routine)
26 June 2012Acapulco KM. 21, MXdaily rain104.9 mm (4.1 in)50.0 mm (2.0 in)40 years33 of 100 (Routine)
26 June 2012Acapulco KM. 21, MXdaily low min (Tie)20.0 C (68.0 F)tie38 years3 of 100 (Routine)
24 June 2012Acapulco KM. 21, MXdaily rain55.9 mm (2.2 in)19.1 mm (0.8 in)21 years16 of 100 (Routine)
18 June 2012Acapulco KM. 21, MXdaily low min18.9 C (66.0 F)1.1 C (2.0 F)38 years22 of 100 (Routine)
16 June 2012Acapulco KM. 21, MXdaily rain129.8 mm (5.1 in)26.7 mm (1.1 in)38 years24 of 100 (Routine)
16 June 2012Acapulco KM. 21, MXdaily low min18.9 C (66.0 F)1.1 C (2.0 F)29 years19 of 100 (Routine)
14 June 2012Acapulco KM. 21, MXdaily low min (Tie)20.6 C (69.1 F)tie40 years4 of 100 (Routine)
9 June 2012Acapulco KM. 21, MXdaily low min18.9 C (66.0 F)1.1 C (2.0 F)29 years19 of 100 (Routine)
8 June 2012Acapulco KM. 21, MXdaily low min19.4 C (66.9 F)0.6 C (1.1 F)33 years17 of 100 (Routine)
7 June 2012Acapulco KM. 21, MXdaily low min (Tie)18.9 C (66.0 F)tie4 years1 of 100 (Routine)
5 June 2012Acapulco KM. 21, MXdaily low min (Tie)18.9 C (66.0 F)tie24 years2 of 100 (Routine)
4 June 2012Acapulco KM. 21, MXdaily low min (Tie)19.4 C (66.9 F)tie24 years2 of 100 (Routine)
31 May 2012Acapulco KM. 21, MXdaily low min15.0 C (59.0 F)2.8 C (5.0 F)24 years23 of 100 (Routine)

Climate Trend

26 complete years, 1972 to 2009
Annual mean temperature at Acapulco KM. 21 as warming stripes, 1972 to 2009 One stripe for each of 26 complete years at Acapulco KM. 21, 1972 to 2009. Blue stripes are years cooler than the station's own mean of 27.3 C (81.1 F); red stripes are warmer. The coolest year was 2008, at 25.6 C (78.1 F), and the warmest was 1972, at 28.7 C (83.7 F). The strongest colour marks a difference of 1.8 C (3.2 F). 1972: 28.7 C, +1.4 C from the station mean1973: 28.2 C, +0.9 C from the station mean1974: 27.7 C, +0.4 C from the station mean1976: 27.7 C, +0.4 C from the station mean1977: 28.1 C, +0.8 C from the station mean1978: 27.9 C, +0.6 C from the station mean1979: 27.8 C, +0.5 C from the station mean1980: 27.3 C, 0.0 C from the station mean1981: 26.8 C, -0.5 C from the station mean1982: 27.1 C, -0.2 C from the station mean1983: 26.9 C, -0.4 C from the station mean1984: 26.5 C, -0.8 C from the station mean1985: 26.7 C, -0.6 C from the station mean1986: 27.3 C, 0.0 C from the station mean1987: 27.8 C, +0.5 C from the station mean1989: 26.7 C, -0.6 C from the station mean1990: 27.5 C, +0.2 C from the station mean1993: 27.8 C, +0.5 C from the station mean1994: 27.7 C, +0.4 C from the station mean1995: 27.9 C, +0.6 C from the station mean1996: 27.1 C, -0.2 C from the station mean1997: 26.9 C, -0.4 C from the station mean1998: 27.2 C, -0.1 C from the station mean2007: 26.5 C, -0.8 C from the station mean2008: 25.6 C, -1.7 C from the station mean2009: 26.5 C, -0.8 C from the station mean19721975198019851990199520002005
One stripe for each of 26 complete years at Acapulco KM. 21, 1972 to 2009. Blue stripes are years cooler than the station's own mean of 27.3 C (81.1 F); red stripes are warmer. The coolest year was 2008, at 25.6 C (78.1 F), and the warmest was 1972, at 28.7 C (83.7 F). The strongest colour marks a difference of 1.8 C (3.2 F).
Annual mean temperature at Acapulco KM. 21 as warming stripes, 1972 to 2009
YearAnnual mean temperatureDifference from the station mean
197228.7 C+1.43 C
197328.2 C+0.92 C
197427.7 C+0.45 C
197627.7 C+0.37 C
197728.1 C+0.85 C
197827.9 C+0.63 C
197927.8 C+0.48 C
198027.3 C+0.05 C
198126.8 C-0.52 C
198227.1 C-0.22 C
198326.9 C-0.43 C
198426.5 C-0.81 C
198526.7 C-0.64 C
198627.3 C-0.01 C
198727.8 C+0.52 C
198926.7 C-0.60 C
199027.5 C+0.16 C
199327.8 C+0.50 C
199427.7 C+0.38 C
199527.9 C+0.57 C
199627.1 C-0.17 C
199726.9 C-0.36 C
199827.2 C-0.11 C
200726.5 C-0.80 C
200825.6 C-1.70 C
200926.5 C-0.84 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

1971 to 2013
Yearly extremes at Acapulco KM. 21: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)41.7 C (107.1 F)197137.8 C (100.0 F)39
Coldest night (TNn)10.0 C (50.0 F)197613.9 C (57.0 F)39
Wettest day (Rx1day)231.9 mm (9.1 in)1981105.7 mm (4.2 in)40
Wettest five days (Rx5day)381.3 mm (15.0 in)1981201.4 mm (7.9 in)40
Longest dry spell (CDD)166 days1991114 days40

Hottest day (TXx)

Hottest day (TXx) at Acapulco KM. 21 by year The hottest day of the year at Acapulco KM. 21, 1971 to 2013. The record is 41.7 C (107.1 F) in 1971, marked on the chart; the median year is 37.8 C (100.0 F). 34363840421980199020002010Record: 41.7 C (107.1 F) in 1971
The hottest day of the year at Acapulco KM. 21, 1971 to 2013. The record is 41.7 C (107.1 F) in 1971, marked on the chart; the median year is 37.8 C (100.0 F).
Hottest day (TXx) at Acapulco KM. 21 by year
YearHottest day (TXx)
197141.7 C (107.1 F)
197240.6 C (105.1 F)
197340.6 C (105.1 F)
197440.0 C (104.0 F)
197540.0 C (104.0 F)
197641.7 C (107.1 F)
197740.0 C (104.0 F)
197840.6 C (105.1 F)
197941.7 C (107.1 F)
198038.9 C (102.0 F)
198138.3 C (100.9 F)
198237.8 C (100.0 F)
198337.8 C (100.0 F)
198436.7 C (98.1 F)
198537.8 C (100.0 F)
198638.3 C (100.9 F)
198738.3 C (100.9 F)
198837.2 C (99.0 F)
198937.2 C (99.0 F)
199038.3 C (100.9 F)
199138.3 C (100.9 F)
1992n/a
199335.6 C (96.1 F)
199436.1 C (97.0 F)
199536.7 C (98.1 F)
199636.1 C (97.0 F)
199736.7 C (98.1 F)
199836.7 C (98.1 F)
199936.7 C (98.1 F)
200037.2 C (99.0 F)
200136.7 C (98.1 F)
200238.3 C (100.9 F)
200336.7 C (98.1 F)
200635.6 C (96.1 F)
200735.6 C (96.1 F)
200836.7 C (98.1 F)
200936.7 C (98.1 F)
201037.8 C (100.0 F)
201236.1 C (97.0 F)
201338.3 C (100.9 F)

Coldest night (TNn)

Coldest night (TNn) at Acapulco KM. 21 by year The coldest night of the year at Acapulco KM. 21, 1971 to 2013. The record is 10.0 C (50.0 F) in 1976, marked on the chart; the median year is 13.9 C (57.0 F). 101520251980199020002010Record: 10.0 C (50.0 F) in 1976
The coldest night of the year at Acapulco KM. 21, 1971 to 2013. The record is 10.0 C (50.0 F) in 1976, marked on the chart; the median year is 13.9 C (57.0 F).
Coldest night (TNn) at Acapulco KM. 21 by year
YearColdest night (TNn)
197115.0 C (59.0 F)
197211.1 C (52.0 F)
197313.9 C (57.0 F)
197413.9 C (57.0 F)
197512.8 C (55.0 F)
197610.0 C (50.0 F)
197712.8 C (55.0 F)
197812.2 C (54.0 F)
197913.3 C (55.9 F)
198014.4 C (57.9 F)
198113.3 C (55.9 F)
198213.9 C (57.0 F)
198313.3 C (55.9 F)
198415.0 C (59.0 F)
198515.0 C (59.0 F)
198614.4 C (57.9 F)
198714.4 C (57.9 F)
198812.8 C (55.0 F)
198915.0 C (59.0 F)
199014.4 C (57.9 F)
199111.7 C (53.1 F)
1992n/a
199320.0 C (68.0 F)
199420.6 C (69.1 F)
199520.0 C (68.0 F)
199616.1 C (61.0 F)
199715.0 C (59.0 F)
199816.1 C (61.0 F)
199912.8 C (55.0 F)
200013.9 C (57.0 F)
200113.9 C (57.0 F)
200211.7 C (53.1 F)
200316.7 C (62.1 F)
200615.0 C (59.0 F)
200713.9 C (57.0 F)
200811.7 C (53.1 F)
200915.0 C (59.0 F)
201012.8 C (55.0 F)
201215.0 C (59.0 F)
201316.7 C (62.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Acapulco KM. 21 by year The wettest day of the year at Acapulco KM. 21, 1971 to 2013. The record is 231.9 mm (9.1 in) in 1981, marked on the chart; the median year is 105.7 mm (4.2 in). 01002003001980199020002010Record: 231.9 mm (9.1 in) in 1981
The wettest day of the year at Acapulco KM. 21, 1971 to 2013. The record is 231.9 mm (9.1 in) in 1981, marked on the chart; the median year is 105.7 mm (4.2 in).
Wettest day (Rx1day) at Acapulco KM. 21 by year
YearWettest day (Rx1day)
197183.3 mm (3.3 in)
1972102.9 mm (4.1 in)
1973187.5 mm (7.4 in)
1974211.3 mm (8.3 in)
1975112.0 mm (4.4 in)
1976169.9 mm (6.7 in)
197759.9 mm (2.4 in)
1978163.6 mm (6.4 in)
197988.4 mm (3.5 in)
198073.9 mm (2.9 in)
1981231.9 mm (9.1 in)
198281.5 mm (3.2 in)
1983100.8 mm (4.0 in)
198479.8 mm (3.1 in)
198564.5 mm (2.5 in)
198697.5 mm (3.8 in)
198768.3 mm (2.7 in)
1988174.5 mm (6.9 in)
1989146.1 mm (5.8 in)
199078.0 mm (3.1 in)
199175.9 mm (3.0 in)
199279.8 mm (3.1 in)
1993142.7 mm (5.6 in)
199454.9 mm (2.2 in)
1995190.0 mm (7.5 in)
1996164.3 mm (6.5 in)
1997217.9 mm (8.6 in)
1998112.8 mm (4.4 in)
1999129.8 mm (5.1 in)
200098.3 mm (3.9 in)
2001106.9 mm (4.2 in)
2002160.0 mm (6.3 in)
200342.9 mm (1.7 in)
20060.0 mm (0.00 in)
2007104.4 mm (4.1 in)
2008108.0 mm (4.3 in)
2009192.0 mm (7.6 in)
2010151.1 mm (5.9 in)
2012129.8 mm (5.1 in)
20139.9 mm (0.39 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Acapulco KM. 21 by year The wettest five days of the year at Acapulco KM. 21, 1971 to 2013. The record is 381.3 mm (15.0 in) in 1981, marked on the chart; the median year is 201.4 mm (7.9 in). 01002003004001980199020002010Record: 381.3 mm (15.0 in) in 1981
The wettest five days of the year at Acapulco KM. 21, 1971 to 2013. The record is 381.3 mm (15.0 in) in 1981, marked on the chart; the median year is 201.4 mm (7.9 in).
Wettest five days (Rx5day) at Acapulco KM. 21 by year
YearWettest five days (Rx5day)
1971180.4 mm (7.1 in)
1972254.6 mm (10.0 in)
1973279.5 mm (11.0 in)
1974259.2 mm (10.2 in)
1975247.8 mm (9.8 in)
1976317.7 mm (12.5 in)
197794.4 mm (3.7 in)
1978178.0 mm (7.0 in)
1979191.9 mm (7.6 in)
1980125.0 mm (4.9 in)
1981381.3 mm (15.0 in)
1982135.0 mm (5.3 in)
1983135.4 mm (5.3 in)
1984169.0 mm (6.7 in)
1985112.0 mm (4.4 in)
198699.4 mm (3.9 in)
1987111.8 mm (4.4 in)
1988324.4 mm (12.8 in)
1989289.1 mm (11.4 in)
1990113.8 mm (4.5 in)
1991201.4 mm (7.9 in)
1992171.3 mm (6.7 in)
1993296.7 mm (11.7 in)
1994103.2 mm (4.1 in)
1995270.5 mm (10.6 in)
1996245.6 mm (9.7 in)
1997284.9 mm (11.2 in)
1998201.3 mm (7.9 in)
1999323.1 mm (12.7 in)
2000182.6 mm (7.2 in)
2001195.6 mm (7.7 in)
2002283.3 mm (11.2 in)
200380.3 mm (3.2 in)
20060.0 mm (0.00 in)
2007260.6 mm (10.3 in)
2008211.6 mm (8.3 in)
2009328.4 mm (12.9 in)
2010250.9 mm (9.9 in)
2012219.7 mm (8.6 in)
20139.9 mm (0.39 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Acapulco KM. 21 by year The longest dry spell of the year at Acapulco KM. 21, 1971 to 2013. The record is 166 days in 1991, marked on the chart; the median year is 114 days. 0501001502001980199020002010Record: 166 days in 1991
The longest dry spell of the year at Acapulco KM. 21, 1971 to 2013. The record is 166 days in 1991, marked on the chart; the median year is 114 days.
Longest dry spell (CDD) at Acapulco KM. 21 by year
YearLongest dry spell (CDD)
197170 days
1972145 days
197394 days
1974137 days
1975108 days
1976105 days
197785 days
197856 days
197997 days
1980115 days
1981134 days
1982100 days
198371 days
1984110 days
1985116 days
1986112 days
198794 days
1988159 days
1989151 days
1990126 days
1991166 days
1992119 days
1993158 days
1994149 days
199584 days
1996146 days
1997146 days
1998161 days
1999120 days
200084 days
200182 days
2002104 days
200332 days
200661 days
2007160 days
2008139 days
2009127 days
2010125 days
201262 days
201373 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

34 years, 1972 to 2010

A day with at least 118.7 mm (4.7 in) of rain is expected about once in 2 years. A day with at least 282.4 mm (11.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Acapulco KM. 21: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years118.7 mm (4.7 in)
5 years166.0 mm (6.5 in)
10 years195.9 mm (7.7 in)
25 years232.1 mm (9.1 in)
50 years257.8 mm (10.1 in)Longer than the 34 years of record
100 years282.4 mm (11.1 in)Longer than the 34 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, 34 years of values from 1972 to 2010.

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: 231.9 mm (9.1 in) in 1981; 217.9 mm (8.6 in) in 1997; 211.3 mm (8.3 in) in 1974.

Download the Data

  • Data for Acapulco KM. 21 standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Acapulco KM. 21 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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

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