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Built 2026-10-19 (19 October 2026)

Harlingen Rio Grande Vly Intl Weather Records (USW00012904)

Record envelope, standing records and threshold days for Harlingen Rio Grande Vly Intl (USW00012904), Texas, United States, with 75 years of record.

Key Facts for Harlingen Rio Grande Vly Intl

  • Harlingen Rio Grande Vly Intl (USW00012904) is a weather station in Texas, United States at 26.23 latitude and -97.66 longitude, 9 m (31 ft) above sea level.
  • The station reports from 1952 to 2026, 75 years of record.
  • 1,464 records set at Harlingen Rio Grande Vly Intl still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Harlingen Rio Grande Vly Intl tied a daily record high minimum temperature of 25.6 C (78.1 F) on 14 October 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Texas, United States, 26.23 latitude, -97.66 longitude.
  • Elevation: 9 m (31 ft).
  • Period of record: 1952 to 2026, 75 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

51 days at or beyond a record
Daily record high and record low at Harlingen Rio Grande Vly Intl, with 2026 drawn through them The band shows the record high and record low for each calendar day at Harlingen Rio Grande Vly Intl. The lines show the 2026 daily maximum and minimum. 51 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -1001020304050 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Harlingen Rio Grande Vly Intl. The lines show the 2026 daily maximum and minimum. 51 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Harlingen Rio Grande Vly Intl, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan34.4 C (93.9 F)-8.3 C (17.1 F)32.2 C (90.0 F)-3.3 C (26.1 F)
Feb35.6 C (96.1 F)-5.5 C (22.1 F)35.0 C (95.0 F)1.7 C (35.1 F)
Mar38.3 C (100.9 F)1.1 C (34.0 F)36.7 C (98.1 F)6.1 C (43.0 F)
Apr41.1 C (106.0 F)5.0 C (41.0 F)34.4 C (93.9 F)11.1 C (52.0 F)
May41.7 C (107.1 F)10.0 C (50.0 F)35.6 C (96.1 F)13.3 C (55.9 F)
Jun41.1 C (106.0 F)15.6 C (60.1 F)37.8 C (100.0 F)22.8 C (73.0 F)
Jul41.1 C (106.0 F)20.0 C (68.0 F)41.1 C (106.0 F)21.7 C (71.1 F)
Aug41.1 C (106.0 F)20.0 C (68.0 F)40.6 C (105.1 F)22.2 C (72.0 F)
Sep41.7 C (107.1 F)11.7 C (53.1 F)40.0 C (104.0 F)21.7 C (71.1 F)
Oct38.3 C (100.9 F)3.9 C (39.0 F)35.0 C (95.0 F)20.6 C (69.1 F)
Nov34.4 C (93.9 F)-0.5 C (31.1 F)n/an/a
Dec32.2 C (90.0 F)-2.7 C (27.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Harlingen Rio Grande Vly Intl by the year they were set 1,464 records at Harlingen Rio Grande Vly Intl still stand. 2011 holds the most, with 66. 0204060801952: 151953: 391954: 351955: 421956: 241957: 391958: 351959: 431960: 441961: 331962: 131997: 451998: 391999: 372000: 512001: 242002: 292003: 282004: 272005: 312006: 462007: 332008: 272009: 372010: 272011: 662012: 402013: 342014: 342015: 292016: 342017: 462018: 372019: 502020: 392021: 342022: 382023: 462024: 262025: 462026: 22195219571962200120062011201620212026
1,464 records at Harlingen Rio Grande Vly Intl still stand. 2011 holds the most, with 66.
Standing records at Harlingen Rio Grande Vly Intl by the year they were set
Year setStanding records
195215
195339
195435
195542
195624
195739
195835
195943
196044
196133
196213
199745
199839
199937
200051
200124
200229
200328
200427
200531
200646
200733
200827
200937
201027
201166
201240
201334
201434
201529
201634
201746
201837
201950
202039
202134
202238
202346
202426
202546
202622

All-Time Record Progression

3 new records
When Harlingen Rio Grande Vly Intl set new all-time records 3 all-time records were set at Harlingen Rio Grande Vly Intl between 26 July 2020 and 27 March 2025. Each dot is a new record. Record daily precipitationRecord high minimum temperature26 July 2020: Record daily precipitation 270.3 mm (10.6 in)28 July 2020: Record high minimum temperature 28.9 C (84.0 F)27 March 2025: Record daily precipitation 350.3 mm (13.8 in)20202025
3 all-time records were set at Harlingen Rio Grande Vly Intl between 26 July 2020 and 27 March 2025. Each dot is a new record.
When Harlingen Rio Grande Vly Intl set new all-time records
DateKindDetail
2020-07-26Record daily precipitationRecord daily precipitation 270.3 mm (10.6 in)
2020-07-28Record high minimum temperatureRecord high minimum temperature 28.9 C (84.0 F)
2025-03-27Record daily precipitationRecord daily precipitation 350.3 mm (13.8 in)

Wettest Day of Each Month

Mar: 350.3 mm (13.8 in)
Record daily precipitation for each month at Harlingen Rio Grande Vly Intl The wettest day on record for each calendar month at Harlingen Rio Grande Vly Intl. The most was 350.3 mm (13.8 in) on 27 March 2025. 0100200300400 Jan: 52.3 mm (2.1 in), 27 January 2018 Jan Feb: 68.1 mm (2.7 in), 20 February 1958 Feb Mar: 350.3 mm (13.8 in), 27 March 2025 Mar Apr: 114.3 mm (4.5 in), 5 April 1961 Apr May: 170.9 mm (6.7 in), 25 May 2007 May Jun: 159.8 mm (6.3 in), 24 June 2019 Jun Jul: 270.3 mm (10.6 in), 26 July 2020 Jul Aug: 168.9 mm (6.6 in), 12 August 1960 Aug Sep: 158.8 mm (6.3 in), 12 September 2018 Sep Oct: 155.2 mm (6.1 in), 1 October 2021 Oct Nov: 120.7 mm (4.8 in), 22 November 2013 Nov Dec: 70.4 mm (2.8 in), 6 December 2024 Dec
The wettest day on record for each calendar month at Harlingen Rio Grande Vly Intl. The most was 350.3 mm (13.8 in) on 27 March 2025.
Record daily precipitation for each month at Harlingen Rio Grande Vly Intl
MonthRecord daily precipitation (mm)Date
Jan52.3 mm (2.1 in)27 January 2018
Feb68.1 mm (2.7 in)20 February 1958
Mar350.3 mm (13.8 in)27 March 2025
Apr114.3 mm (4.5 in)5 April 1961
May170.9 mm (6.7 in)25 May 2007
Jun159.8 mm (6.3 in)24 June 2019
Jul270.3 mm (10.6 in)26 July 2020
Aug168.9 mm (6.6 in)12 August 1960
Sep158.8 mm (6.3 in)12 September 2018
Oct155.2 mm (6.1 in)1 October 2021
Nov120.7 mm (4.8 in)22 November 2013
Dec70.4 mm (2.8 in)6 December 2024

Period of Record Coverage

1952 to 2026
Days with data per year at Harlingen Rio Grande Vly Intl 41 years of record at Harlingen Rio Grande Vly Intl, 1952 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 1952, 1962, 2026. 1952: 170 of 366 days1953: 363 of 365 days1954: 365 of 365 days1955: 361 of 365 days1956: 366 of 366 days1957: 364 of 365 days1958: 365 of 365 days1959: 365 of 365 days1960: 366 of 366 days1961: 365 of 365 days1962: 145 of 365 days1997: 356 of 365 days1998: 365 of 365 days1999: 359 of 365 days2000: 350 of 366 days2001: 362 of 365 days2002: 363 of 365 days2003: 362 of 365 days2004: 365 of 366 days2005: 365 of 365 days2006: 358 of 365 days2007: 361 of 365 days2008: 356 of 366 days2009: 365 of 365 days2010: 362 of 365 days2011: 365 of 365 days2012: 365 of 366 days2013: 365 of 365 days2014: 362 of 365 days2015: 365 of 365 days2016: 365 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 364 of 365 days2020: 363 of 366 days2021: 364 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 363 of 365 days2026: 285 of 365 days1960200020102020
41 years of record at Harlingen Rio Grande Vly Intl, 1952 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 1952, 1962, 2026.
Days with data per year at Harlingen Rio Grande Vly Intl
YearDays with dataShare of yearComplete
195217046%No
195336399%Yes
1954365100%Yes
195536199%Yes
1956366100%Yes
1957364100%Yes
1958365100%Yes
1959365100%Yes
1960366100%Yes
1961365100%Yes
196214540%No
199735698%Yes
1998365100%Yes
199935998%Yes
200035096%Yes
200136299%Yes
200236399%Yes
200336299%Yes
2004365100%Yes
2005365100%Yes
200635898%Yes
200736199%Yes
200835697%Yes
2009365100%Yes
201036299%Yes
2011365100%Yes
2012365100%Yes
2013365100%Yes
201436299%Yes
2015365100%Yes
2016365100%Yes
2017365100%Yes
2018365100%Yes
2019364100%Yes
202036399%Yes
2021364100%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
202536399%Yes
202628578%No

Latest Records

20
Latest records at Harlingen Rio Grande Vly Intl
DateStationRecordValueBeat old record byOld record stoodSignificance
14 October 2026Harlingen Rio Grande Vly Intl, USdaily high min (Tie, Provisional)25.6 C (78.1 F)tie8 years2 of 100 (Routine)
4 October 2026Harlingen Rio Grande Vly Intl, USdaily rain (Provisional)112.0 mm (4.4 in)43.4 mm (1.7 in)67 years50 of 100 (Notable)
3 October 2026Harlingen Rio Grande Vly Intl, USdaily rain (Tie, Provisional)27.4 mm (1.1 in)tie8 years2 of 100 (Routine)
2 October 2026Harlingen Rio Grande Vly Intl, USdaily rain (Provisional)37.8 mm (1.5 in)26.4 mm (1.0 in)71 years42 of 100 (Notable)
30 September 2026Harlingen Rio Grande Vly Intl, USdaily high min (Provisional)26.7 C (80.1 F)1.1 C (2.0 F)71 years33 of 100 (Routine)
30 September 2026Harlingen Rio Grande Vly Intl, USdaily high max (Provisional)37.8 C (100.0 F)1.7 C (3.1 F)20 years19 of 100 (Routine)
21 September 2026Harlingen Rio Grande Vly Intl, USdaily high max (Provisional)37.8 C (100.0 F)1.1 C (2.0 F)15 years15 of 100 (Routine)
20 September 2026Harlingen Rio Grande Vly Intl, USdaily high max (Provisional)37.8 C (100.0 F)1.1 C (2.0 F)8 years13 of 100 (Routine)
19 September 2026Harlingen Rio Grande Vly Intl, USdaily high max (Tie, Provisional)37.2 C (99.0 F)tie8 years2 of 100 (Routine)
17 September 2026Harlingen Rio Grande Vly Intl, USdaily high max (Provisional)37.8 C (100.0 F)1.1 C (2.0 F)15 years15 of 100 (Routine)
15 September 2026Harlingen Rio Grande Vly Intl, USdaily high max (Provisional)38.9 C (102.0 F)0.6 C (1.1 F)3 years9 of 100 (Routine)
14 September 2026Harlingen Rio Grande Vly Intl, USdaily high min (Tie, Provisional)25.6 C (78.1 F)tie8 years2 of 100 (Routine)
13 September 2026Harlingen Rio Grande Vly Intl, USdaily high max (Provisional)38.9 C (102.0 F)1.1 C (2.0 F)15 years15 of 100 (Routine)
13 September 2026Harlingen Rio Grande Vly Intl, USdaily high min (Provisional)27.8 C (82.0 F)0.6 C (1.1 F)17 years14 of 100 (Routine)
12 September 2026Harlingen Rio Grande Vly Intl, USdaily high min (Provisional)27.2 C (81.0 F)2.2 C (4.0 F)20 years23 of 100 (Routine)
12 September 2026Harlingen Rio Grande Vly Intl, USdaily high max (Provisional)38.9 C (102.0 F)0.6 C (1.1 F)15 years13 of 100 (Routine)
11 September 2026Harlingen Rio Grande Vly Intl, USdaily high max (Provisional)39.4 C (102.9 F)1.6 C (2.9 F)25 years19 of 100 (Routine)
11 September 2026Harlingen Rio Grande Vly Intl, USdaily high min (Provisional)27.2 C (81.0 F)1.1 C (2.0 F)20 years18 of 100 (Routine)
10 September 2026Harlingen Rio Grande Vly Intl, USdaily high max (Provisional)40.0 C (104.0 F)1.1 C (2.0 F)3 years11 of 100 (Routine)
7 September 2026Harlingen Rio Grande Vly Intl, USdaily high max (Provisional)38.9 C (102.0 F)0.6 C (1.1 F)3 years9 of 100 (Routine)

Climate Trend

38 complete years, 1953 to 2025
Annual mean temperature at Harlingen Rio Grande Vly Intl as warming stripes, 1953 to 2025 One stripe for each of 38 complete years at Harlingen Rio Grande Vly Intl, 1953 to 2025. 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 1960, at 22.3 C (72.2 F), and the warmest was 2012, at 25.1 C (77.1 F). The strongest colour marks a difference of 1.5 C (2.7 F). 1953: 23.9 C, +0.1 C from the station mean1954: 23.8 C, +0.1 C from the station mean1955: 23.4 C, -0.3 C from the station mean1956: 23.5 C, -0.3 C from the station mean1957: 23.9 C, +0.2 C from the station mean1958: 22.8 C, -1.0 C from the station mean1959: 22.7 C, -1.1 C from the station mean1960: 22.3 C, -1.4 C from the station mean1961: 22.8 C, -1.0 C from the station mean1997: 22.6 C, -1.2 C from the station mean1998: 23.9 C, +0.2 C from the station mean1999: 23.6 C, -0.2 C from the station mean2000: 24.2 C, +0.5 C from the station mean2001: 23.9 C, +0.1 C from the station mean2002: 23.9 C, +0.1 C from the station mean2003: 23.4 C, -0.3 C from the station mean2004: 23.6 C, -0.2 C from the station mean2005: 24.2 C, +0.4 C from the station mean2006: 24.6 C, +0.8 C from the station mean2007: 23.4 C, -0.4 C from the station mean2008: 23.7 C, -0.1 C from the station mean2009: 23.9 C, +0.1 C from the station mean2010: 23.0 C, -0.8 C from the station mean2011: 24.4 C, +0.7 C from the station mean2012: 25.1 C, +1.3 C from the station mean2013: 23.4 C, -0.4 C from the station mean2014: 23.0 C, -0.8 C from the station mean2015: 23.8 C, 0.0 C from the station mean2016: 24.9 C, +1.1 C from the station mean2017: 24.8 C, +1.0 C from the station mean2018: 23.7 C, 0.0 C from the station mean2019: 24.0 C, +0.2 C from the station mean2020: 24.5 C, +0.7 C from the station mean2021: 23.9 C, +0.1 C from the station mean2022: 23.5 C, -0.3 C from the station mean2023: 24.6 C, +0.9 C from the station mean2024: 24.6 C, +0.9 C from the station mean2025: 24.4 C, +0.6 C from the station mean19531960197019801990200020102020
One stripe for each of 38 complete years at Harlingen Rio Grande Vly Intl, 1953 to 2025. 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 1960, at 22.3 C (72.2 F), and the warmest was 2012, at 25.1 C (77.1 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Harlingen Rio Grande Vly Intl as warming stripes, 1953 to 2025
YearAnnual mean temperatureDifference from the station mean
195323.9 C+0.09 C
195423.8 C+0.05 C
195523.4 C-0.35 C
195623.5 C-0.31 C
195723.9 C+0.15 C
195822.8 C-1.00 C
195922.7 C-1.07 C
196022.3 C-1.45 C
196122.8 C-1.02 C
199722.6 C-1.19 C
199823.9 C+0.16 C
199923.6 C-0.22 C
200024.2 C+0.45 C
200123.9 C+0.07 C
200223.9 C+0.13 C
200323.4 C-0.35 C
200423.6 C-0.17 C
200524.2 C+0.38 C
200624.6 C+0.84 C
200723.4 C-0.39 C
200823.7 C-0.12 C
200923.9 C+0.12 C
201023.0 C-0.83 C
201124.4 C+0.65 C
201225.1 C+1.29 C
201323.4 C-0.39 C
201423.0 C-0.77 C
201523.8 C+0.04 C
201624.9 C+1.13 C
201724.8 C+1.04 C
201823.7 C-0.04 C
201924.0 C+0.23 C
202024.5 C+0.73 C
202123.9 C+0.10 C
202223.5 C-0.30 C
202324.6 C+0.86 C
202424.6 C+0.86 C
202524.4 C+0.59 C

The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1953 to 2025. In Fahrenheit: 0.3 F (0.1 to 0.4) per decade. The slope is a straight line fitted to 38 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Harlingen Rio Grande Vly Intl
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.1 C (0.1 to 0.2) per decade0.3 F (0.1 to 0.4) per decade1953 to 202538Rise
Mean daily maximum0.3 C (0.2 to 0.4) per decade0.6 F (0.4 to 0.7) per decade1953 to 202538Rise
Mean daily minimum-0.03 C (-0.11 to 0.04) per decade-0.1 F (-0.2 to 0.1) per decade1953 to 202538Not clearly different from zero

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

1952 to 2026
Yearly extremes at Harlingen Rio Grande Vly Intl: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)41.7 C (107.1 F)200038.9 C (102.0 F)41
Coldest night (TNn)-8.3 C (17.1 F)19620.0 C (32.0 F)41
Wettest day (Rx1day)350.3 mm (13.8 in)202588.5 mm (3.5 in)40
Wettest five days (Rx5day)390.4 mm (15.4 in)2025129.2 mm (5.1 in)40
Longest dry spell (CDD)100 days201141 days40

Hottest day (TXx)

Hottest day (TXx) at Harlingen Rio Grande Vly Intl by year The hottest day of the year at Harlingen Rio Grande Vly Intl, 1952 to 2026. The record is 41.7 C (107.1 F) in 2000, marked on the chart; the median year is 38.9 C (102.0 F). 34363840421960198020002020Record: 41.7 C (107.1 F) in 2000
The hottest day of the year at Harlingen Rio Grande Vly Intl, 1952 to 2026. The record is 41.7 C (107.1 F) in 2000, marked on the chart; the median year is 38.9 C (102.0 F).
Hottest day (TXx) at Harlingen Rio Grande Vly Intl by year
YearHottest day (TXx)
195237.2 C (99.0 F)
195338.9 C (102.0 F)
195439.4 C (102.9 F)
195538.3 C (100.9 F)
195637.8 C (100.0 F)
195736.7 C (98.1 F)
195837.2 C (99.0 F)
195937.2 C (99.0 F)
196037.8 C (100.0 F)
196136.7 C (98.1 F)
196235.6 C (96.1 F)
199738.3 C (100.9 F)
199840.0 C (104.0 F)
199939.4 C (102.9 F)
200041.7 C (107.1 F)
200138.9 C (102.0 F)
200238.9 C (102.0 F)
200340.0 C (104.0 F)
200438.3 C (100.9 F)
200540.6 C (105.1 F)
200638.9 C (102.0 F)
200736.7 C (98.1 F)
200837.8 C (100.0 F)
200938.9 C (102.0 F)
201038.9 C (102.0 F)
201141.7 C (107.1 F)
201241.1 C (106.0 F)
201341.1 C (106.0 F)
201438.3 C (100.9 F)
201538.9 C (102.0 F)
201639.4 C (102.9 F)
201740.6 C (105.1 F)
201841.1 C (106.0 F)
201940.6 C (105.1 F)
202038.9 C (102.0 F)
202137.2 C (99.0 F)
202241.1 C (106.0 F)
202340.6 C (105.1 F)
202441.7 C (107.1 F)
202539.4 C (102.9 F)
202641.1 C (106.0 F)

Coldest night (TNn)

Coldest night (TNn) at Harlingen Rio Grande Vly Intl by year The coldest night of the year at Harlingen Rio Grande Vly Intl, 1952 to 2026. The record is -8.3 C (17.1 F) in 1962, marked on the chart; the median year is 0.0 C (32.0 F). -10-5051960198020002020Record: -8.3 C (17.1 F) in 1962
The coldest night of the year at Harlingen Rio Grande Vly Intl, 1952 to 2026. The record is -8.3 C (17.1 F) in 1962, marked on the chart; the median year is 0.0 C (32.0 F).
Coldest night (TNn) at Harlingen Rio Grande Vly Intl by year
YearColdest night (TNn)
19523.9 C (39.0 F)
19531.1 C (34.0 F)
19541.7 C (35.1 F)
19551.7 C (35.1 F)
19561.7 C (35.1 F)
19571.7 C (35.1 F)
19580.0 C (32.0 F)
1959-0.6 C (30.9 F)
1960-1.1 C (30.0 F)
19610.0 C (32.0 F)
1962-8.3 C (17.1 F)
1997-1.1 C (30.0 F)
19980.0 C (32.0 F)
19991.1 C (34.0 F)
20000.0 C (32.0 F)
2001-1.1 C (30.0 F)
2002-3.3 C (26.1 F)
20030.6 C (33.1 F)
2004-0.6 C (30.9 F)
20051.1 C (34.0 F)
2006-0.5 C (31.1 F)
20071.1 C (34.0 F)
2008-0.5 C (31.1 F)
2009-1.6 C (29.1 F)
2010-3.8 C (25.2 F)
2011-2.7 C (27.1 F)
20121.7 C (35.1 F)
20131.7 C (35.1 F)
20140.6 C (33.1 F)
20152.8 C (37.0 F)
20161.7 C (35.1 F)
2017-1.6 C (29.1 F)
2018-1.6 C (29.1 F)
20190.6 C (33.1 F)
20200.0 C (32.0 F)
2021-5.5 C (22.1 F)
2022-2.7 C (27.1 F)
20230.0 C (32.0 F)
2024-3.8 C (25.2 F)
2025-4.3 C (24.3 F)
2026-3.3 C (26.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Harlingen Rio Grande Vly Intl by year The wettest day of the year at Harlingen Rio Grande Vly Intl, 1952 to 2026. The record is 350.3 mm (13.8 in) in 2025, marked on the chart; the median year is 88.5 mm (3.5 in). 01002003004001960198020002020Record: 350.3 mm (13.8 in) in 2025
The wettest day of the year at Harlingen Rio Grande Vly Intl, 1952 to 2026. The record is 350.3 mm (13.8 in) in 2025, marked on the chart; the median year is 88.5 mm (3.5 in).
Wettest day (Rx1day) at Harlingen Rio Grande Vly Intl by year
YearWettest day (Rx1day)
195237.3 mm (1.5 in)
195389.9 mm (3.5 in)
195499.1 mm (3.9 in)
1955127.0 mm (5.0 in)
195638.1 mm (1.5 in)
195782.8 mm (3.3 in)
195868.1 mm (2.7 in)
195994.7 mm (3.7 in)
1960168.9 mm (6.6 in)
1961114.3 mm (4.5 in)
196222.9 mm (0.9 in)
1997n/a
199899.3 mm (3.9 in)
199968.6 mm (2.7 in)
200044.7 mm (1.8 in)
200155.9 mm (2.2 in)
2002111.8 mm (4.4 in)
2003109.2 mm (4.3 in)
200491.7 mm (3.6 in)
200568.6 mm (2.7 in)
200656.4 mm (2.2 in)
2007170.9 mm (6.7 in)
2008141.5 mm (5.6 in)
200961.7 mm (2.4 in)
201087.1 mm (3.4 in)
201141.7 mm (1.6 in)
201240.1 mm (1.6 in)
2013120.7 mm (4.8 in)
201486.1 mm (3.4 in)
201574.9 mm (2.9 in)
201659.4 mm (2.3 in)
201747.5 mm (1.9 in)
2018158.8 mm (6.3 in)
2019159.8 mm (6.3 in)
2020270.3 mm (10.6 in)
2021155.2 mm (6.1 in)
2022113.3 mm (4.5 in)
202371.1 mm (2.8 in)
202482.6 mm (3.3 in)
2025350.3 mm (13.8 in)
2026112.0 mm (4.4 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Harlingen Rio Grande Vly Intl by year The wettest five days of the year at Harlingen Rio Grande Vly Intl, 1952 to 2026. The record is 390.4 mm (15.4 in) in 2025, marked on the chart; the median year is 129.2 mm (5.1 in). 01002003004001960198020002020Record: 390.4 mm (15.4 in) in 2025
The wettest five days of the year at Harlingen Rio Grande Vly Intl, 1952 to 2026. The record is 390.4 mm (15.4 in) in 2025, marked on the chart; the median year is 129.2 mm (5.1 in).
Wettest five days (Rx5day) at Harlingen Rio Grande Vly Intl by year
YearWettest five days (Rx5day)
195251.3 mm (2.0 in)
1953229.8 mm (9.0 in)
1954123.0 mm (4.8 in)
1955183.1 mm (7.2 in)
195639.4 mm (1.6 in)
1957114.8 mm (4.5 in)
1958159.3 mm (6.3 in)
1959133.6 mm (5.3 in)
1960189.5 mm (7.5 in)
1961207.3 mm (8.2 in)
196232.3 mm (1.3 in)
1997n/a
1998182.8 mm (7.2 in)
1999106.4 mm (4.2 in)
200072.9 mm (2.9 in)
200174.6 mm (2.9 in)
2002146.3 mm (5.8 in)
2003160.6 mm (6.3 in)
2004104.7 mm (4.1 in)
200595.0 mm (3.7 in)
200675.2 mm (3.0 in)
2007268.4 mm (10.6 in)
2008160.3 mm (6.3 in)
200972.1 mm (2.8 in)
201099.6 mm (3.9 in)
201152.3 mm (2.1 in)
201264.3 mm (2.5 in)
2013156.0 mm (6.1 in)
2014101.2 mm (4.0 in)
2015149.0 mm (5.9 in)
2016106.5 mm (4.2 in)
201761.1 mm (2.4 in)
2018271.4 mm (10.7 in)
2019161.1 mm (6.3 in)
2020310.5 mm (12.2 in)
2021155.2 mm (6.1 in)
2022124.8 mm (4.9 in)
2023146.5 mm (5.8 in)
2024118.4 mm (4.7 in)
2025390.4 mm (15.4 in)
2026182.3 mm (7.2 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Harlingen Rio Grande Vly Intl by year The longest dry spell of the year at Harlingen Rio Grande Vly Intl, 1952 to 2026. The record is 100 days in 2011, marked on the chart; the median year is 41 days. 204060801001960198020002020Record: 100 days in 2011
The longest dry spell of the year at Harlingen Rio Grande Vly Intl, 1952 to 2026. The record is 100 days in 2011, marked on the chart; the median year is 41 days.
Longest dry spell (CDD) at Harlingen Rio Grande Vly Intl by year
YearLongest dry spell (CDD)
195241 days
195344 days
195437 days
195542 days
195636 days
195787 days
195853 days
195938 days
196033 days
196142 days
196235 days
1997n/a
199875 days
199939 days
200041 days
200130 days
200240 days
200339 days
200440 days
200529 days
200641 days
200743 days
200856 days
200961 days
201061 days
2011100 days
201235 days
201363 days
201431 days
201548 days
201641 days
201729 days
201827 days
201928 days
202063 days
202167 days
202249 days
202371 days
202427 days
202555 days
202652 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

36 years, 1953 to 2025

A day with at least 87.9 mm (3.5 in) of rain is expected about once in 2 years. A day with at least 363.7 mm (14.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Harlingen Rio Grande Vly Intl: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years87.9 mm (3.5 in)
5 years137.5 mm (5.4 in)
10 years178.4 mm (7.0 in)
25 years241.3 mm (9.5 in)
50 years297.8 mm (11.7 in)Longer than the 36 years of record
100 years363.7 mm (14.3 in)Longer than the 36 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, 36 years of values from 1953 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: 350.3 mm (13.8 in) in 2025; 270.3 mm (10.6 in) in 2020; 170.9 mm (6.7 in) in 2007.

Download the Data

  • Data for Harlingen Rio Grande Vly Intl standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Harlingen Rio Grande Vly Intl 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). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-17).