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Built 2026-10-19 (19 October 2026)

Harlingen Rio Grande Vly Intl Threshold Days by Year (USW00012904)

13 fixed thresholds counted per year at Harlingen Rio Grande Vly Intl (USW00012904): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Harlingen Rio Grande Vly Intl Thresholds

  • Harlingen Rio Grande Vly Intl: days with a maximum temperature at or above 30 C (86 F) in 39 years, most in 2012 with 256.
  • Harlingen Rio Grande Vly Intl: days with a maximum temperature at or above 35 C (95 F) in 39 years, most in 2011 with 132.
  • Harlingen Rio Grande Vly Intl: days with a maximum temperature at or above 90 F (32.2 C) in 39 years, most in 2011 with 200.
  • Harlingen Rio Grande Vly Intl: nights with a minimum temperature at or above 20 C (68 F) in 39 years, most in 2002 with 205.
  • 13 fixed thresholds have at least one qualifying day at Harlingen Rio Grande Vly Intl.
39 years with a qualifying day
Days at or above 30 C (86 F) per year at Harlingen Rio Grande Vly Intl Days per year at Harlingen Rio Grande Vly Intl with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 256 in 2012. 01002003001953: 1851954: 1781955: 1841956: 1831957: 1741958: 1601959: 1841960: 1591961: 1771997: 1621998: 1781999: 2002000: 2162001: 2022002: 2122003: 1852004: 1912005: 2162006: 2262007: 2032008: 1992009: 2112010: 1932011: 2432012: 2562013: 1952014: 1812015: 2122016: 2372017: 2502018: 2102019: 2112020: 2322021: 2192022: 2202023: 2202024: 2352025: 2442026: 2101953195719612000200420082012201620202024
Days per year at Harlingen Rio Grande Vly Intl with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 256 in 2012.
Days at or above 30 C (86 F) per year at Harlingen Rio Grande Vly Intl
YearDaysDecade average
1953185178.3
1954178178.3
1955184178.3
1956183178.3
1957174178.3
1958160178.3
1959184178.3
1960159168
1961177168
1997162180
1998178180
1999200180
2000216206.1
2001202206.1
2002212206.1
2003185206.1
2004191206.1
2005216206.1
2006226206.1
2007203206.1
2008199206.1
2009211206.1
2010193218.8
2011243218.8
2012256218.8
2013195218.8
2014181218.8
2015212218.8
2016237218.8
2017250218.8
2018210218.8
2019211218.8
2020232225.7
2021219225.7
2022220225.7
2023220225.7
2024235225.7
2025244225.7
2026210225.7
First to last qualifying date each year at Harlingen Rio Grande Vly Intl For each year, a bar from the first to the last day at Harlingen Rio Grande Vly Intl meeting 30 C (86 F). 1953: 8 January 1953 to 5 December 19531954: 10 February 1954 to 28 November 19541955: 15 January 1955 to 25 December 19551956: 19 February 1956 to 19 November 19561957: 22 January 1957 to 6 November 19571958: 26 February 1958 to 24 October 19581959: 17 February 1959 to 5 November 19591960: 14 January 1960 to 26 November 19601961: 5 March 1961 to 10 December 19611997: 4 January 1997 to 28 November 19971998: 7 March 1998 to 31 October 19981999: 27 February 1999 to 4 December 19992000: 11 January 2000 to 12 November 20002001: 26 February 2001 to 27 November 20012002: 18 January 2002 to 10 November 20022003: 3 February 2003 to 23 November 20032004: 6 April 2004 to 9 December 20042005: 13 February 2005 to 3 December 20052006: 2 January 2006 to 29 November 20062007: 24 February 2007 to 21 December 20072008: 8 January 2008 to 27 December 20082009: 19 January 2009 to 29 October 20092010: 10 March 2010 to 31 December 20102011: 19 February 2011 to 30 December 20112012: 17 January 2012 to 25 December 20122013: 29 January 2013 to 21 December 20132014: 17 February 2014 to 4 November 20142015: 16 February 2015 to 26 December 20152016: 31 January 2016 to 26 December 20162017: 2 January 2017 to 22 December 20172018: 4 February 2018 to 8 November 20182019: 15 February 2019 to 16 December 20192020: 14 January 2020 to 23 December 20202021: 25 January 2021 to 31 December 20212022: 1 January 2022 to 10 December 20222023: 3 January 2023 to 9 November 20232024: 22 February 2024 to 30 December 20242025: 3 February 2025 to 27 December 20252026: 2 January 2026 to 14 October 202619531958199820032008201320182023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Harlingen Rio Grande Vly Intl meeting 30 C (86 F).
First to last qualifying date each year at Harlingen Rio Grande Vly Intl
YearFirst dateLast date
19531953-01-081953-12-05
19541954-02-101954-11-28
19551955-01-151955-12-25
19561956-02-191956-11-19
19571957-01-221957-11-06
19581958-02-261958-10-24
19591959-02-171959-11-05
19601960-01-141960-11-26
19611961-03-051961-12-10
19971997-01-041997-11-28
19981998-03-071998-10-31
19991999-02-271999-12-04
20002000-01-112000-11-12
20012001-02-262001-11-27
20022002-01-182002-11-10
20032003-02-032003-11-23
20042004-04-062004-12-09
20052005-02-132005-12-03
20062006-01-022006-11-29
20072007-02-242007-12-21
20082008-01-082008-12-27
20092009-01-192009-10-29
20102010-03-102010-12-31
20112011-02-192011-12-30
20122012-01-172012-12-25
20132013-01-292013-12-21
20142014-02-172014-11-04
20152015-02-162015-12-26
20162016-01-312016-12-26
20172017-01-022017-12-22
20182018-02-042018-11-08
20192019-02-152019-12-16
20202020-01-142020-12-23
20212021-01-252021-12-31
20222022-01-012022-12-10
20232023-01-032023-11-09
20242024-02-222024-12-30
20252025-02-032025-12-27
20262026-01-022026-10-14

Every Fixed Threshold

Fixed thresholds at Harlingen Rio Grande Vly Intl
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days392562012210
35 C (95 F): Days391322011104
40 C (104 F): Days14420125
90 F (32.2 C): Days392002011174
100 F (37.8 C): Days3355202356
0 C (32 F): Frost days (min24720113
20 C (68 F): Tropical nights (min392052002190
25 C (77 F): Days with min3975195352
10 mm (0.39 in): Days with 10 mm or more rain3729195814
25 mm (0.98 in): Days with 25 mm or more rain371420216
50 mm (1.97 in): Days with 50 mm or more rain32620212
100 mm (3.94 in): Days with 100 mm or more rain15219611
200 mm (7.87 in): Days with 200 mm or more rain2120201

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1953.

Download the Data

  • 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). Threshold counts are computed by this site.

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