Port Isabel Threshold Days by Year (USC00417179)

13 fixed thresholds counted per year at Port Isabel (USC00417179): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Port Isabel Thresholds

Port Isabel: days with a maximum temperature at or above 30 C (86 F) in 72 years, most in 2006 with 192.
Port Isabel: days with a maximum temperature at or above 90 F (32.2 C) in 72 years, most in 2009 with 136.
Port Isabel: nights with a minimum temperature at or above 20 C (68 F) in 72 years, most in 1938 with 239.
Port Isabel: nights with a minimum temperature at or above 25 C (77 F) in 72 years, most in 1946 with 128.
13 fixed thresholds have at least one qualifying day at Port Isabel.

Days at or above 30 C (86 F)

72 years with a qualifying day

Days per year at Port Isabel with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 192 in 2006.

Days at or above 30 C (86 F) per year at Port Isabel
Year	Days	Decade average
1929	142	142
1930	112	124
1931	127	124
1932	118	124
1933	141	124
1934	98	124
1935	145	124
1936	67	124
1937	153	124
1938	155	124
1940	122	129.3
1941	140	129.3
1942	113	129.3
1943	106	129.3
1944	121	129.3
1945	141	129.3
1946	144	129.3
1947	141	129.3
1948	123	129.3
1949	142	129.3
1950	164	143.1
1951	128	143.1
1952	112	143.1
1953	147	143.1
1954	151	143.1
1955	149	143.1
1956	158	143.1
1957	159	143.1
1958	142	143.1
1959	121	143.1
1960	139	140.7
1961	137	140.7
1962	148	140.7
1963	144	140.7
1964	151	140.7
1965	141	140.7
1966	125	140.7
1977	137	137.7
1978	147	137.7
1979	129	137.7
1980	155	135.5
1981	161	135.5
1984	147	135.5
1985	142	135.5
1986	136	135.5
1987	101	135.5
1988	109	135.5
1989	133	135.5
1990	149	137
1991	133	137
1992	125	137
1993	140	137
1994	149	137
1995	143	137
1996	118	137
1997	111	137
1998	140	137
1999	162	137
2000	159	159.7
2001	143	159.7
2002	144	159.7
2003	148	159.7
2004	147	159.7
2005	168	159.7
2006	192	159.7
2007	161	159.7
2008	165	159.7
2009	170	159.7
2023	165	153
2024	141	153
2025	173	153
2026	133	153

For each year, a bar from the first to the last day at Port Isabel meeting 30 C (86 F).

First to last qualifying date each year at Port Isabel
Year	First date	Last date
1929	1929-04-13	1929-10-30
1930	1930-04-07	1930-10-16
1931	1931-06-07	1931-11-17
1932	1932-03-21	1932-11-23
1933	1933-04-05	1933-12-03
1934	1934-07-08	1934-11-10
1935	1935-04-29	1935-11-10
1936	1936-01-12	1936-10-22
1937	1937-04-04	1937-11-09
1938	1938-03-30	1938-12-18
1940	1940-05-17	1940-11-05
1941	1941-04-01	1941-10-30
1942	1942-05-27	1942-11-12
1943	1943-05-10	1943-09-22
1944	1944-04-10	1944-11-25
1945	1945-02-13	1945-11-13
1946	1946-02-09	1946-11-10
1947	1947-03-23	1947-11-10
1948	1948-05-01	1948-11-26
1949	1949-03-21	1949-11-29
1950	1950-04-24	1950-11-20
1951	1951-05-09	1951-11-15
1952	1952-05-09	1952-10-06
1953	1953-03-22	1953-10-12
1954	1954-02-27	1954-10-26
1955	1955-03-21	1955-10-28
1956	1956-02-27	1956-11-02
1957	1957-03-18	1957-11-07
1958	1958-04-23	1958-11-13
1959	1959-05-11	1959-11-05
1960	1960-04-05	1960-11-09
1961	1961-04-03	1961-11-02
1962	1962-02-09	1962-10-28
1963	1963-04-08	1963-11-22
1964	1964-03-19	1964-12-03
1965	1965-02-11	1965-11-25
1966	1966-05-22	1966-10-25
1977	1977-04-03	1977-12-06
1978	1978-04-11	1978-10-24
1979	1979-04-12	1979-11-10
1980	1980-03-20	1980-10-28
1981	1981-04-30	1981-11-21
1984	1984-03-27	1984-11-02
1985	1985-04-06	1985-10-20
1986	1986-01-01	1986-10-13
1987	1987-05-31	1987-10-27
1988	1988-04-23	1988-11-27
1989	1989-03-29	1989-11-16
1990	1990-02-16	1990-10-21
1991	1991-03-06	1991-11-17
1992	1992-03-19	1992-11-04
1993	1993-04-08	1993-11-15
1994	1994-04-28	1994-11-28
1995	1995-02-12	1995-10-03
1996	1996-03-07	1996-10-17
1997	1997-04-11	1997-11-01
1998	1998-02-23	1998-10-20
1999	1999-03-02	1999-11-07
2000	2000-01-23	2000-10-17
2001	2001-03-15	2001-10-29
2002	2002-01-25	2002-11-14
2003	2003-04-06	2003-10-10
2004	2004-04-04	2004-11-01
2005	2005-02-14	2005-11-13
2006	2006-02-02	2006-12-20
2007	2007-04-03	2007-11-21
2008	2008-01-08	2008-10-19
2009	2009-02-26	2009-10-29
2023	2023-02-23	2023-11-09
2024	2024-03-23	2024-11-19
2025	2025-02-13	2025-11-24
2026	2026-02-20	2026-10-14

Every Fixed Threshold

Fixed thresholds at Port Isabel
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	72	192	2006	133
35 C (95 F): Days	50	60	2023	19
90 F (32.2 C): Days	72	136	2009	93
100 F (37.8 C): Days	6	3	2002	2
0 C (32 F): Ice days (max	4	1	1951	1
0 C (32 F): Frost days (min	29	7	1963	2
20 C (68 F): Tropical nights (min	72	239	1938	183
25 C (77 F): Days with min	72	128	1946	117
10 mm (0.39 in): Days with 10 mm or more rain	71	32	1992	17
25 mm (0.98 in): Days with 25 mm or more rain	71	20	1987	13
50 mm (1.97 in): Days with 50 mm or more rain	63	7	1987	4
100 mm (3.94 in): Days with 100 mm or more rain	26	3	1930	1
200 mm (7.87 in): Days with 200 mm or more rain	2	1	1984	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1929.

Download the Data

Data for Port Isabel 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Port Isabel Threshold Days by Year (USC00417179)

Key Facts for Port Isabel Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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