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Built 2026-10-15 (15 October 2026)

Piedras Negras (Obs) Weather Records (MXM00076243)

Record envelope, standing records and threshold days for Piedras Negras (Obs) (MXM00076243), Mexico, with 71 years of record.

Key Facts for Piedras Negras (Obs)

  • Piedras Negras (Obs) (MXM00076243) is a weather station in Mexico at 28.70 latitude and -100.52 longitude, 250 m (819 ft) above sea level.
  • The station reports from 1955 to 2025, 71 years of record.
  • 1,464 records set at Piedras Negras (Obs) still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Piedras Negras (Obs) set a daily record precipitation of 19.8 mm (0.8 in) on 20 August 2025.

About the Station

  • Location: Mexico, 28.70 latitude, -100.52 longitude.
  • Elevation: 250 m (819 ft).
  • Period of record: 1955 to 2025, 71 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

6 days at or beyond a record
Daily record high and record low at Piedras Negras (Obs), with 2026 drawn through them The band shows the record high and record low for each calendar day at Piedras Negras (Obs). The lines show the 2026 daily maximum and minimum. 6 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Piedras Negras (Obs). The lines show the 2026 daily maximum and minimum. 6 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Piedras Negras (Obs), with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan37.2 C (99.0 F)-9.4 C (15.1 F)25.0 C (77.0 F)-2.0 C (28.4 F)
Feb40.0 C (104.0 F)-9.4 C (15.1 F)33.8 C (92.8 F)-3.0 C (26.6 F)
Mar40.0 C (104.0 F)-7.2 C (19.0 F)39.0 C (102.2 F)7.0 C (44.6 F)
Apr44.2 C (111.6 F)-1.1 C (30.0 F)39.2 C (102.6 F)6.8 C (44.2 F)
May45.0 C (113.0 F)5.6 C (42.1 F)42.4 C (108.3 F)15.0 C (59.0 F)
Jun48.3 C (118.9 F)10.0 C (50.0 F)41.2 C (106.2 F)19.4 C (66.9 F)
Jul46.7 C (116.1 F)16.7 C (62.1 F)40.5 C (104.9 F)22.2 C (72.0 F)
Aug46.2 C (115.2 F)15.0 C (59.0 F)42.6 C (108.7 F)22.0 C (71.6 F)
Sep46.1 C (115.0 F)8.9 C (48.0 F)n/an/a
Oct41.2 C (106.2 F)-3.3 C (26.1 F)n/an/a
Nov36.2 C (97.2 F)-7.2 C (19.0 F)n/an/a
Dec33.6 C (92.5 F)-10.6 C (12.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Piedras Negras (Obs) by the year they were set 1,464 records at Piedras Negras (Obs) still stand. 1955 holds the most, with 111. 0501001501955: 1111956: 521957: 861958: 501959: 631960: 571977: 151978: 251979: 141980: 131981: 131982: 61983: 111984: 111985: 161986: 41987: 31988: 21989: 211990: 81991: 211992: 151993: 91994: 361995: 331996: 361997: 261998: 481999: 422000: 572001: 202002: 372003: 292004: 272005: 272006: 392007: 222008: 292009: 212010: 102011: 412012: 322013: 182014: 112015: 112016: 222017: 132018: 202019: 172020: 222021: 162022: 192023: 232024: 222025: 121955197719831989199520012007201320192025
1,464 records at Piedras Negras (Obs) still stand. 1955 holds the most, with 111.
Standing records at Piedras Negras (Obs) by the year they were set
Year setStanding records
1955111
195652
195786
195850
195963
196057
197715
197825
197914
198013
198113
19826
198311
198411
198516
19864
19873
19882
198921
19908
199121
199215
19939
199436
199533
199636
199726
199848
199942
200057
200120
200237
200329
200427
200527
200639
200722
200829
200921
201010
201141
201232
201318
201411
201511
201622
201713
201820
201917
202022
202116
202219
202323
202422
202512

Wettest Day of Each Month

Sep: 175.8 mm (6.9 in)
Record daily precipitation for each month at Piedras Negras (Obs) The wettest day on record for each calendar month at Piedras Negras (Obs). The most was 175.8 mm (6.9 in) on 9 September 2001. 050100150200 Jan: 27.7 mm (1.1 in), 3 January 2007 Jan Feb: 34.3 mm (1.4 in), 4 February 2010 Feb Mar: 70.6 mm (2.8 in), 6 March 1999 Mar Apr: 128.3 mm (5.1 in), 18 April 1957 Apr May: 136.1 mm (5.4 in), 26 May 1957 May Jun: 160.3 mm (6.3 in), 15 June 2013 Jun Jul: 158.0 mm (6.2 in), 22 July 1992 Jul Aug: 119.4 mm (4.7 in), 24 August 1999 Aug Sep: 175.8 mm (6.9 in), 9 September 2001 Sep Oct: 112.3 mm (4.4 in), 15 October 1960 Oct Nov: 48.3 mm (1.9 in), 5 November 1983 Nov Dec: 74.9 mm (2.9 in), 11 December 1991 Dec
The wettest day on record for each calendar month at Piedras Negras (Obs). The most was 175.8 mm (6.9 in) on 9 September 2001.
Record daily precipitation for each month at Piedras Negras (Obs)
MonthRecord daily precipitation (mm)Date
Jan27.7 mm (1.1 in)3 January 2007
Feb34.3 mm (1.4 in)4 February 2010
Mar70.6 mm (2.8 in)6 March 1999
Apr128.3 mm (5.1 in)18 April 1957
May136.1 mm (5.4 in)26 May 1957
Jun160.3 mm (6.3 in)15 June 2013
Jul158.0 mm (6.2 in)22 July 1992
Aug119.4 mm (4.7 in)24 August 1999
Sep175.8 mm (6.9 in)9 September 2001
Oct112.3 mm (4.4 in)15 October 1960
Nov48.3 mm (1.9 in)5 November 1983
Dec74.9 mm (2.9 in)11 December 1991

Period of Record Coverage

1955 to 2025
Days with data per year at Piedras Negras (Obs) 55 years of record at Piedras Negras (Obs), 1955 to 2025. 35 years have data for under 90 percent of days and are left out of rankings: 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984 and others. 1955: 346 of 365 days1956: 360 of 366 days1957: 361 of 365 days1958: 362 of 365 days1959: 363 of 365 days1960: 362 of 366 days1977: 252 of 365 days1978: 195 of 365 days1979: 134 of 365 days1980: 223 of 366 days1981: 214 of 365 days1982: 122 of 365 days1983: 115 of 365 days1984: 143 of 366 days1985: 129 of 365 days1986: 74 of 365 days1987: 29 of 365 days1988: 30 of 366 days1989: 161 of 365 days1990: 131 of 365 days1991: 198 of 365 days1992: 253 of 366 days1993: 168 of 365 days1994: 346 of 365 days1995: 348 of 365 days1996: 347 of 366 days1997: 350 of 365 days1998: 346 of 365 days1999: 349 of 365 days2000: 330 of 366 days2001: 344 of 365 days2002: 349 of 365 days2003: 342 of 365 days2004: 347 of 366 days2005: 348 of 365 days2006: 346 of 365 days2007: 342 of 365 days2008: 311 of 366 days2009: 196 of 365 days2010: 192 of 365 days2011: 200 of 365 days2012: 217 of 366 days2013: 199 of 365 days2014: 213 of 365 days2015: 200 of 365 days2016: 206 of 366 days2017: 192 of 365 days2018: 217 of 365 days2019: 201 of 365 days2020: 188 of 366 days2021: 203 of 365 days2022: 180 of 365 days2023: 154 of 365 days2024: 165 of 366 days2025: 108 of 365 days196019801990200020102020
55 years of record at Piedras Negras (Obs), 1955 to 2025. 35 years have data for under 90 percent of days and are left out of rankings: 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984 and others.
Days with data per year at Piedras Negras (Obs)
YearDays with dataShare of yearComplete
195534695%Yes
195636098%Yes
195736199%Yes
195836299%Yes
195936399%Yes
196036299%Yes
197725269%No
197819553%No
197913437%No
198022361%No
198121459%No
198212233%No
198311532%No
198414339%No
198512935%No
19867420%No
1987298%No
1988308%No
198916144%No
199013136%No
199119854%No
199225369%No
199316846%No
199434695%Yes
199534895%Yes
199634795%Yes
199735096%Yes
199834695%Yes
199934996%Yes
200033090%Yes
200134494%Yes
200234996%Yes
200334294%Yes
200434795%Yes
200534895%Yes
200634695%Yes
200734294%Yes
200831185%No
200919654%No
201019253%No
201120055%No
201221759%No
201319955%No
201421358%No
201520055%No
201620656%No
201719253%No
201821759%No
201920155%No
202018851%No
202120356%No
202218049%No
202315442%No
202416545%No
202510830%No

Latest Records

20
Latest records at Piedras Negras (Obs)
DateStationRecordValueBeat old record byOld record stoodSignificance
20 August 2025Piedras Negras (Obs), MXdaily rain19.8 mm (0.8 in)14.2 mm (0.6 in)68 years20 of 100 (Routine)
8 August 2025Piedras Negras (Obs), MXdaily high min (Tie)27.0 C (80.6 F)tie14 years2 of 100 (Routine)
2 August 2025Piedras Negras (Obs), MXdaily high min27.4 C (81.3 F)0.6 C (1.1 F)16 years14 of 100 (Routine)
23 July 2025Piedras Negras (Obs), MXdaily rain22.1 mm (0.9 in)21.3 mm (0.8 in)15 years19 of 100 (Routine)
10 June 2025Piedras Negras (Obs), MXdaily high min26.2 C (79.2 F)0.1 C (0.2 F)30 years16 of 100 (Routine)
3 June 2025Piedras Negras (Obs), MXdaily high min (Tie)25.8 C (78.4 F)tie7 years2 of 100 (Routine)
30 May 2025Piedras Negras (Obs), MXdaily rain33.0 mm (1.3 in)10.1 mm (0.4 in)28 years20 of 100 (Routine)
23 May 2025Piedras Negras (Obs), MXdaily high min (Tie)25.0 C (77.0 F)tie16 years3 of 100 (Routine)
20 May 2025Piedras Negras (Obs), MXdaily high min25.0 C (77.0 F)0.4 C (0.7 F)3 years8 of 100 (Routine)
9 May 2025Piedras Negras (Obs), MXdaily rain125.5 mm (4.9 in)108.2 mm (4.3 in)18 years52 of 100 (Notable)
14 April 2025Piedras Negras (Obs), MXdaily high max39.2 C (102.6 F)0.2 C (0.4 F)7 years9 of 100 (Routine)
31 March 2025Piedras Negras (Obs), MXdaily high max36.6 C (97.9 F)0.6 C (1.1 F)16 years12 of 100 (Routine)
31 March 2025Piedras Negras (Obs), MXdaily high min19.0 C (66.2 F)0.8 C (1.4 F)10 years11 of 100 (Routine)
30 March 2025Piedras Negras (Obs), MXdaily high max36.4 C (97.5 F)0.8 C (1.4 F)16 years13 of 100 (Routine)
26 March 2025Piedras Negras (Obs), MXdaily high min (Tie)20.0 C (68.0 F)tie20 years3 of 100 (Routine)
15 March 2025Piedras Negras (Obs), MXdaily high max39.0 C (102.2 F)1.5 C (2.7 F)8 years11 of 100 (Routine)
20 February 2025Piedras Negras (Obs), MXdaily low min-3.0 C (26.6 F)4.7 C (8.5 F)66 years35 of 100 (Notable)
20 February 2025Piedras Negras (Obs), MXdaily low max6.6 C (43.9 F)1.2 C (2.2 F)67 years28 of 100 (Routine)
9 February 2025Piedras Negras (Obs), MXdaily high min18.0 C (64.4 F)0.2 C (0.4 F)68 years27 of 100 (Routine)
4 February 2025Piedras Negras (Obs), MXdaily high max31.8 C (89.2 F)0.1 C (0.2 F)19 years12 of 100 (Routine)

Climate Trend

18 complete years, 1956 to 2007
Annual mean temperature at Piedras Negras (Obs) as warming stripes, 1956 to 2007 One stripe for each of 18 complete years at Piedras Negras (Obs), 1956 to 2007. Blue stripes are years cooler than the station's own mean of 22.2 C (72.0 F); red stripes are warmer. The coolest year was 1957, at 19.2 C (66.6 F), and the warmest was 2006, at 24.4 C (76.0 F). The strongest colour marks a difference of 3.1 C (5.6 F). 1956: 20.2 C, -2.0 C from the station mean1957: 19.2 C, -3.0 C from the station mean1958: 19.6 C, -2.6 C from the station mean1959: 19.6 C, -2.6 C from the station mean1960: 20.8 C, -1.5 C from the station mean1994: 23.4 C, +1.1 C from the station mean1995: 23.1 C, +0.9 C from the station mean1996: 23.1 C, +0.9 C from the station mean1997: 22.1 C, -0.1 C from the station mean1998: 24.1 C, +1.9 C from the station mean1999: 24.0 C, +1.7 C from the station mean2001: 23.6 C, +1.3 C from the station mean2002: 23.1 C, +0.8 C from the station mean2003: 22.5 C, +0.2 C from the station mean2004: 22.0 C, -0.2 C from the station mean2005: 23.1 C, +0.9 C from the station mean2006: 24.4 C, +2.2 C from the station mean2007: 22.3 C, +0.1 C from the station mean19561960196519701975198019851990199520002005
One stripe for each of 18 complete years at Piedras Negras (Obs), 1956 to 2007. Blue stripes are years cooler than the station's own mean of 22.2 C (72.0 F); red stripes are warmer. The coolest year was 1957, at 19.2 C (66.6 F), and the warmest was 2006, at 24.4 C (76.0 F). The strongest colour marks a difference of 3.1 C (5.6 F).
Annual mean temperature at Piedras Negras (Obs) as warming stripes, 1956 to 2007
YearAnnual mean temperatureDifference from the station mean
195620.2 C-2.01 C
195719.2 C-3.03 C
195819.6 C-2.61 C
195919.6 C-2.61 C
196020.8 C-1.47 C
199423.4 C+1.13 C
199523.1 C+0.85 C
199623.1 C+0.90 C
199722.1 C-0.15 C
199824.1 C+1.85 C
199924.0 C+1.72 C
200123.6 C+1.33 C
200223.1 C+0.84 C
200322.5 C+0.22 C
200422.0 C-0.20 C
200523.1 C+0.90 C
200624.4 C+2.19 C
200722.3 C+0.09 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

1955 to 2025
Yearly extremes at Piedras Negras (Obs): the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)48.3 C (118.9 F)199843.6 C (110.5 F)55
Coldest night (TNn)-10.6 C (12.9 F)1983-3.2 C (26.2 F)55
Wettest day (Rx1day)175.8 mm (6.9 in)200163.9 mm (2.5 in)56
Wettest five days (Rx5day)267.1 mm (10.5 in)199279.0 mm (3.1 in)54
Longest dry spell (CDD)97 days195642 days56

Hottest day (TXx)

Hottest day (TXx) at Piedras Negras (Obs) by year The hottest day of the year at Piedras Negras (Obs), 1955 to 2025. The record is 48.3 C (118.9 F) in 1998, marked on the chart; the median year is 43.6 C (110.5 F). 354045501960198020002020Record: 48.3 C (118.9 F) in 1998
The hottest day of the year at Piedras Negras (Obs), 1955 to 2025. The record is 48.3 C (118.9 F) in 1998, marked on the chart; the median year is 43.6 C (110.5 F).
Hottest day (TXx) at Piedras Negras (Obs) by year
YearHottest day (TXx)
195537.8 C (100.0 F)
195640.0 C (104.0 F)
195740.6 C (105.1 F)
195840.0 C (104.0 F)
195941.1 C (106.0 F)
196044.4 C (111.9 F)
1976n/a
197742.2 C (108.0 F)
197845.0 C (113.0 F)
197939.0 C (102.2 F)
198044.0 C (111.2 F)
198139.0 C (102.2 F)
198241.4 C (106.5 F)
198341.0 C (105.8 F)
198444.2 C (111.6 F)
198541.4 C (106.5 F)
198640.8 C (105.4 F)
198739.2 C (102.6 F)
198839.4 C (102.9 F)
198942.3 C (108.1 F)
199041.3 C (106.3 F)
199142.6 C (108.7 F)
199242.5 C (108.5 F)
199343.4 C (110.1 F)
199445.6 C (114.1 F)
199546.7 C (116.1 F)
199643.3 C (109.9 F)
199742.8 C (109.0 F)
199848.3 C (118.9 F)
199944.4 C (111.9 F)
200046.1 C (115.0 F)
200143.9 C (111.0 F)
200245.0 C (113.0 F)
200345.0 C (113.0 F)
200441.7 C (107.1 F)
200544.4 C (111.9 F)
200643.9 C (111.0 F)
200740.6 C (105.1 F)
200843.3 C (109.9 F)
200944.8 C (112.6 F)
201044.0 C (111.2 F)
201146.2 C (115.2 F)
201244.8 C (112.6 F)
201344.4 C (111.9 F)
201444.6 C (112.3 F)
201543.2 C (109.8 F)
201645.0 C (113.0 F)
201745.0 C (113.0 F)
201844.4 C (111.9 F)
201944.0 C (111.2 F)
202045.2 C (113.4 F)
202142.8 C (109.0 F)
202243.6 C (110.5 F)
202345.6 C (114.1 F)
202445.8 C (114.4 F)
202542.6 C (108.7 F)

Coldest night (TNn)

Coldest night (TNn) at Piedras Negras (Obs) by year The coldest night of the year at Piedras Negras (Obs), 1955 to 2025. The record is -10.6 C (12.9 F) in 1983, marked on the chart; the median year is -3.2 C (26.2 F). -15-10-5051960198020002020Record: -10.6 C (12.9 F) in 1983
The coldest night of the year at Piedras Negras (Obs), 1955 to 2025. The record is -10.6 C (12.9 F) in 1983, marked on the chart; the median year is -3.2 C (26.2 F).
Coldest night (TNn) at Piedras Negras (Obs) by year
YearColdest night (TNn)
1955-10.0 C (14.0 F)
1956-9.4 C (15.1 F)
1957-9.4 C (15.1 F)
1958-8.3 C (17.1 F)
1959-7.2 C (19.0 F)
1960-9.4 C (15.1 F)
1976n/a
1977-6.7 C (19.9 F)
1978-6.0 C (21.2 F)
1979-6.0 C (21.2 F)
1980-4.0 C (24.8 F)
1981-6.0 C (21.2 F)
1982-5.6 C (21.9 F)
1983-10.6 C (12.9 F)
1984-2.6 C (27.3 F)
1985-7.8 C (18.0 F)
1986-2.1 C (28.2 F)
1987-2.3 C (27.9 F)
1988-5.0 C (23.0 F)
1989-4.6 C (23.7 F)
1990-1.2 C (29.8 F)
1991-2.2 C (28.0 F)
1992-4.0 C (24.8 F)
1993-2.0 C (28.4 F)
1994-5.0 C (23.0 F)
19950.6 C (33.1 F)
1996-7.2 C (19.0 F)
1997-4.4 C (24.1 F)
1998-1.7 C (28.9 F)
1999-3.3 C (26.1 F)
2000-2.8 C (27.0 F)
2001-2.2 C (28.0 F)
2002-5.0 C (23.0 F)
2003-3.3 C (26.1 F)
2004-5.0 C (23.0 F)
2005-2.8 C (27.0 F)
2006-2.2 C (28.0 F)
2007-2.2 C (28.0 F)
2008-2.2 C (28.0 F)
2009-1.8 C (28.8 F)
2010-6.4 C (20.5 F)
2011-4.6 C (23.7 F)
2012-1.0 C (30.2 F)
2013-1.0 C (30.2 F)
2014-2.4 C (27.7 F)
20150.0 C (32.0 F)
2016-2.0 C (28.4 F)
20172.6 C (36.7 F)
20180.4 C (32.7 F)
2019-2.6 C (27.3 F)
20202.0 C (35.6 F)
2021-6.0 C (21.2 F)
2022-2.0 C (28.4 F)
20231.0 C (33.8 F)
2024-3.2 C (26.2 F)
2025-3.0 C (26.6 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Piedras Negras (Obs) by year The wettest day of the year at Piedras Negras (Obs), 1955 to 2025. The record is 175.8 mm (6.9 in) in 2001, marked on the chart; the median year is 63.9 mm (2.5 in). 0501001502001960198020002020Record: 175.8 mm (6.9 in) in 2001
The wettest day of the year at Piedras Negras (Obs), 1955 to 2025. The record is 175.8 mm (6.9 in) in 2001, marked on the chart; the median year is 63.9 mm (2.5 in).
Wettest day (Rx1day) at Piedras Negras (Obs) by year
YearWettest day (Rx1day)
1955142.2 mm (5.6 in)
195639.9 mm (1.6 in)
1957136.1 mm (5.4 in)
1958155.4 mm (6.1 in)
1959133.9 mm (5.3 in)
1960112.3 mm (4.4 in)
197622.1 mm (0.9 in)
197737.3 mm (1.5 in)
197852.1 mm (2.1 in)
197962.0 mm (2.4 in)
198024.9 mm (1.0 in)
198164.0 mm (2.5 in)
198228.4 mm (1.1 in)
198348.3 mm (1.9 in)
198445.0 mm (1.8 in)
198575.9 mm (3.0 in)
198630.7 mm (1.2 in)
198718.0 mm (0.7 in)
198831.5 mm (1.2 in)
198941.9 mm (1.6 in)
1990134.9 mm (5.3 in)
199174.9 mm (2.9 in)
1992158.0 mm (6.2 in)
199324.9 mm (1.0 in)
199446.2 mm (1.8 in)
199583.6 mm (3.3 in)
199663.8 mm (2.5 in)
199758.4 mm (2.3 in)
199874.4 mm (2.9 in)
1999119.4 mm (4.7 in)
200074.4 mm (2.9 in)
2001175.8 mm (6.9 in)
200243.9 mm (1.7 in)
2003102.4 mm (4.0 in)
200478.5 mm (3.1 in)
200577.5 mm (3.1 in)
200659.9 mm (2.4 in)
2007130.6 mm (5.1 in)
200886.1 mm (3.4 in)
200932.5 mm (1.3 in)
201055.6 mm (2.2 in)
201122.6 mm (0.9 in)
201223.4 mm (0.9 in)
2013160.3 mm (6.3 in)
201451.1 mm (2.0 in)
2015109.7 mm (4.3 in)
201633.0 mm (1.3 in)
201746.0 mm (1.8 in)
2018104.4 mm (4.1 in)
201981.8 mm (3.2 in)
202068.8 mm (2.7 in)
202145.0 mm (1.8 in)
202293.7 mm (3.7 in)
2023104.1 mm (4.1 in)
202439.1 mm (1.5 in)
2025125.5 mm (4.9 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Piedras Negras (Obs) by year The wettest five days of the year at Piedras Negras (Obs), 1955 to 2025. The record is 267.1 mm (10.5 in) in 1992, marked on the chart; the median year is 79.0 mm (3.1 in). 01002003001960198020002020Record: 267.1 mm (10.5 in) in 1992
The wettest five days of the year at Piedras Negras (Obs), 1955 to 2025. The record is 267.1 mm (10.5 in) in 1992, marked on the chart; the median year is 79.0 mm (3.1 in).
Wettest five days (Rx5day) at Piedras Negras (Obs) by year
YearWettest five days (Rx5day)
1955181.6 mm (7.1 in)
195650.6 mm (2.0 in)
1957226.6 mm (8.9 in)
1958213.6 mm (8.4 in)
1959174.6 mm (6.9 in)
1960181.8 mm (7.2 in)
197610.2 mm (0.4 in)
197744.5 mm (1.8 in)
197822.4 mm (0.9 in)
197951.1 mm (2.0 in)
198051.0 mm (2.0 in)
198182.8 mm (3.3 in)
19820.3 mm (0.01 in)
19836.1 mm (0.24 in)
19840.0 mm (0.00 in)
198529.0 mm (1.1 in)
19863.0 mm (0.12 in)
1987n/a
1988n/a
198941.9 mm (1.6 in)
199019.9 mm (0.8 in)
199181.0 mm (3.2 in)
1992267.1 mm (10.5 in)
199339.9 mm (1.6 in)
199468.4 mm (2.7 in)
1995109.3 mm (4.3 in)
199664.8 mm (2.6 in)
199793.2 mm (3.7 in)
199876.9 mm (3.0 in)
1999203.0 mm (8.0 in)
200094.8 mm (3.7 in)
2001175.8 mm (6.9 in)
2002111.7 mm (4.4 in)
2003109.5 mm (4.3 in)
2004167.0 mm (6.6 in)
2005101.1 mm (4.0 in)
200659.9 mm (2.4 in)
2007148.6 mm (5.9 in)
200897.6 mm (3.8 in)
200933.3 mm (1.3 in)
201064.5 mm (2.5 in)
201122.6 mm (0.9 in)
201224.9 mm (1.0 in)
2013171.2 mm (6.7 in)
201457.5 mm (2.3 in)
2015125.8 mm (5.0 in)
201643.1 mm (1.7 in)
201786.9 mm (3.4 in)
2018192.0 mm (7.6 in)
201981.8 mm (3.2 in)
202077.0 mm (3.0 in)
202165.8 mm (2.6 in)
202293.7 mm (3.7 in)
2023104.1 mm (4.1 in)
202456.9 mm (2.2 in)
2025125.5 mm (4.9 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Piedras Negras (Obs) by year The longest dry spell of the year at Piedras Negras (Obs), 1955 to 2025. The record is 97 days in 1956, marked on the chart; the median year is 42 days. 02550751001960198020002020Record: 97 days in 1956
The longest dry spell of the year at Piedras Negras (Obs), 1955 to 2025. The record is 97 days in 1956, marked on the chart; the median year is 42 days.
Longest dry spell (CDD) at Piedras Negras (Obs) by year
YearLongest dry spell (CDD)
195551 days
195697 days
195761 days
195832 days
195939 days
196040 days
19764 days
197752 days
19787 days
19798 days
19809 days
198111 days
19827 days
19835 days
198410 days
19857 days
19865 days
19872 days
19882 days
198923 days
19907 days
199124 days
199253 days
199313 days
199434 days
199552 days
199661 days
199742 days
199880 days
199964 days
200041 days
200139 days
200268 days
200352 days
200426 days
200570 days
200658 days
200745 days
200869 days
200942 days
201053 days
201172 days
201276 days
201340 days
201457 days
201561 days
201666 days
201733 days
201853 days
201937 days
202060 days
202136 days
202287 days
202343 days
202452 days
202555 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

38 years, 1955 to 2024

A day with at least 76.4 mm (3.0 in) of rain is expected about once in 2 years. A day with at least 219.7 mm (8.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Piedras Negras (Obs): the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years76.4 mm (3.0 in)
5 years116.5 mm (4.6 in)
10 years142.4 mm (5.6 in)
25 years174.2 mm (6.9 in)
50 years197.3 mm (7.8 in)Longer than the 38 years of record
100 years219.7 mm (8.6 in)Longer than the 38 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, 38 years of values from 1955 to 2024.

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: 175.8 mm (6.9 in) in 2001; 160.3 mm (6.3 in) in 2013; 158.0 mm (6.2 in) in 1992.

Download the Data

  • Data for Piedras Negras (Obs) standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Piedras Negras (Obs) 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

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