Isabela Substn Threshold Days by Year (RQC00664702)

9 fixed thresholds counted per year at Isabela Substn (RQC00664702): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Isabela Substn Thresholds

Isabela Substn: days with 10 mm (0.39 in) or more of precipitation in 102 years, most in 1932 with 72.
Isabela Substn: days with 25 mm (0.98 in) or more of precipitation in 102 years, most in 1932 with 33.
Isabela Substn: nights with a minimum temperature at or above 20 C (68 F) in 98 years, most in 2025 with 354.
Isabela Substn: days with 50 mm (1.97 in) or more of precipitation in 98 years, most in 1986 with 11.
9 fixed thresholds have at least one qualifying day at Isabela Substn.

Days at or above 30 C (86 F)

92 years with a qualifying day

Days per year at Isabela Substn with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 333 in 1912.

Days at or above 30 C (86 F) per year at Isabela Substn
Year	Days	Decade average
1901	286	248.1
1903	160	248.1
1904	164	248.1
1905	293	248.1
1907	253	248.1
1908	290	248.1
1909	291	248.1
1910	294	276.9
1911	316	276.9
1912	333	276.9
1914	252	276.9
1915	270	276.9
1916	248	276.9
1919	225	276.9
1920	256	220.9
1921	225	220.9
1922	200	220.9
1923	205	220.9
1924	241	220.9
1925	199	220.9
1926	241	220.9
1927	200	220.9
1931	235	227.7
1932	218	227.7
1933	215	227.7
1934	202	227.7
1935	217	227.7
1936	244	227.7
1937	263	227.7
1940	245	211.6
1941	279	211.6
1942	252	211.6
1943	185	211.6
1944	223	211.6
1945	181	211.6
1949	116	211.6
1950	81	160.4
1952	191	160.4
1953	215	160.4
1954	218	160.4
1955	145	160.4
1956	101	160.4
1957	172	160.4
1963	200	141.4
1964	145	141.4
1965	78	141.4
1966	94	141.4
1967	110	141.4
1968	138	141.4
1969	225	141.4
1970	142	103.9
1971	92	103.9
1972	91	103.9
1973	138	103.9
1974	54	103.9
1975	88	103.9
1976	80	103.9
1977	124	103.9
1978	121	103.9
1979	109	103.9
1980	187	180.9
1983	251	180.9
1984	209	180.9
1985	148	180.9
1986	186	180.9
1988	162	180.9
1989	123	180.9
1990	161	190.3
1991	157	190.3
1992	162	190.3
1993	183	190.3
1994	201	190.3
1995	210	190.3
1996	154	190.3
1997	250	190.3
1998	240	190.3
1999	185	190.3
2000	168	191.9
2001	209	191.9
2002	203	191.9
2003	239	191.9
2004	131	191.9
2005	206	191.9
2006	206	191.9
2007	173	191.9
2011	129	148.5
2012	168	148.5
2022	120	172.4
2023	193	172.4
2024	219	172.4
2025	181	172.4
2026	149	172.4

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

First to last qualifying date each year at Isabela Substn
Year	First date	Last date
1901	1901-01-05	1901-12-31
1903	1903-02-23	1903-12-03
1904	1904-01-08	1904-12-31
1905	1905-01-01	1905-12-24
1907	1907-02-11	1907-12-24
1908	1908-01-01	1908-12-31
1909	1909-01-01	1909-12-31
1910	1910-01-01	1910-12-31
1911	1911-01-09	1911-12-31
1912	1912-01-01	1912-11-30
1914	1914-01-01	1914-12-31
1915	1915-01-01	1915-12-31
1916	1916-01-18	1916-12-24
1919	1919-01-06	1919-12-23
1920	1920-02-04	1920-12-20
1921	1921-01-16	1921-12-16
1922	1922-02-08	1922-12-18
1923	1923-03-01	1923-11-29
1924	1924-02-28	1924-12-01
1925	1925-03-09	1925-12-21
1926	1926-01-11	1926-11-24
1927	1927-01-02	1927-12-22
1931	1931-01-07	1931-12-09
1932	1932-01-04	1932-12-29
1933	1933-01-01	1933-12-30
1934	1934-01-23	1934-12-13
1935	1935-04-01	1935-12-31
1936	1936-01-26	1936-12-18
1937	1937-01-07	1937-12-28
1940	1940-01-02	1940-12-24
1941	1941-01-07	1941-12-31
1942	1942-01-01	1942-12-16
1943	1943-03-23	1943-12-20
1944	1944-01-03	1944-12-27
1945	1945-01-03	1945-12-31
1949	1949-03-20	1949-11-28
1950	1950-05-21	1950-10-30
1952	1952-03-17	1952-11-22
1953	1953-03-27	1953-12-14
1954	1954-03-01	1954-12-29
1955	1955-01-19	1955-11-12
1956	1956-03-20	1956-11-04
1957	1957-03-25	1957-11-12
1963	1963-01-24	1963-12-31
1964	1964-01-15	1964-12-01
1965	1965-04-12	1965-12-25
1966	1966-01-26	1966-11-21
1967	1967-04-21	1967-11-18
1968	1968-02-20	1968-12-12
1969	1969-02-14	1969-12-24
1970	1970-01-06	1970-11-24
1971	1971-03-29	1971-11-08
1972	1972-04-08	1972-12-27
1973	1973-01-14	1973-09-28
1974	1974-04-01	1974-11-12
1975	1975-04-06	1975-11-18
1976	1976-04-10	1976-12-31
1977	1977-01-19	1977-12-28
1978	1978-02-07	1978-11-04
1979	1979-02-02	1979-12-07
1980	1980-02-05	1980-12-30
1983	1983-01-19	1983-12-28
1984	1984-01-06	1984-12-11
1985	1985-03-28	1985-12-25
1986	1986-02-27	1986-12-28
1988	1988-02-10	1988-11-25
1989	1989-02-26	1989-12-27
1990	1990-04-05	1990-11-21
1991	1991-03-04	1991-11-11
1992	1992-01-05	1992-11-29
1993	1993-01-28	1993-12-17
1994	1994-02-23	1994-12-28
1995	1995-01-18	1995-12-26
1996	1996-01-03	1996-11-16
1997	1997-03-22	1997-12-31
1998	1998-01-01	1998-12-30
1999	1999-03-17	1999-11-29
2000	2000-01-26	2000-12-31
2001	2001-01-02	2001-12-13
2002	2002-01-03	2002-12-28
2003	2003-01-04	2003-12-11
2004	2004-01-09	2004-11-08
2005	2005-02-27	2005-11-26
2006	2006-01-15	2006-12-31
2007	2007-01-01	2007-11-19
2011	2011-03-25	2011-11-11
2012	2012-04-23	2012-11-23
2022	2022-04-04	2022-11-15
2023	2023-01-02	2023-12-06
2024	2024-01-22	2024-12-28
2025	2025-01-26	2025-12-16
2026	2026-02-02	2026-10-02

Every Fixed Threshold

Fixed thresholds at Isabela Substn
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	92	333	1912	149
35 C (95 F): Days	15	25	1911	1
90 F (32.2 C): Days	88	234	1912	7
20 C (68 F): Tropical nights (min	98	354	2025	256
25 C (77 F): Days with min	41	32	2023	27
10 mm (0.39 in): Days with 10 mm or more rain	102	72	1932	15
25 mm (0.98 in): Days with 25 mm or more rain	102	33	1932	4
50 mm (1.97 in): Days with 50 mm or more rain	98	11	1986	1
100 mm (3.94 in): Days with 100 mm or more rain	38	3	1909	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1901.

Download the Data

Data for Isabela Substn 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).

Isabela Substn Threshold Days by Year (RQC00664702)

Key Facts for Isabela Substn Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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