Hilo Intl AP 87 Threshold Days by Year (USW00021504)

9 fixed thresholds counted per year at Hilo Intl AP 87 (USW00021504): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Hilo Intl AP 87 Thresholds

Hilo Intl AP 87: days with a maximum temperature at or above 30 C (86 F) in 77 years, most in 2019 with 131.
Hilo Intl AP 87: nights with a minimum temperature at or above 20 C (68 F) in 77 years, most in 2020 with 287.
Hilo Intl AP 87: days with 10 mm (0.39 in) or more of precipitation in 77 years, most in 1990 with 136.
Hilo Intl AP 87: days with 25 mm (0.98 in) or more of precipitation in 77 years, most in 1990 with 55.
9 fixed thresholds have at least one qualifying day at Hilo Intl AP 87.

Days at or above 30 C (86 F)

77 years with a qualifying day

Days per year at Hilo Intl AP 87 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 131 in 2019.

Days at or above 30 C (86 F) per year at Hilo Intl AP 87
Year	Days	Decade average
1950	8	7.7
1951	14	7.7
1952	5	7.7
1953	2	7.7
1954	8	7.7
1955	2	7.7
1956	3	7.7
1957	14	7.7
1958	8	7.7
1959	13	7.7
1960	12	31.1
1961	17	31.1
1962	13	31.1
1963	20	31.1
1964	13	31.1
1965	35	31.1
1966	41	31.1
1967	59	31.1
1968	78	31.1
1969	23	31.1
1970	18	38.6
1971	55	38.6
1972	32	38.6
1973	31	38.6
1974	63	38.6
1975	4	38.6
1976	16	38.6
1977	109	38.6
1978	27	38.6
1979	31	38.6
1980	58	24.9
1981	13	24.9
1982	9	24.9
1983	6	24.9
1984	3	24.9
1985	3	24.9
1986	69	24.9
1987	41	24.9
1988	40	24.9
1989	7	24.9
1990	12	41.9
1991	25	41.9
1992	58	41.9
1993	26	41.9
1994	59	41.9
1995	88	41.9
1996	83	41.9
1997	64	41.9
1998	3	41.9
1999	1	41.9
2000	1	28.7
2001	7	28.7
2002	12	28.7
2003	58	28.7
2004	69	28.7
2005	29	28.7
2006	11	28.7
2007	61	28.7
2008	29	28.7
2009	10	28.7
2010	7	50.8
2011	6	50.8
2012	5	50.8
2013	36	50.8
2014	62	50.8
2015	114	50.8
2016	67	50.8
2017	24	50.8
2018	56	50.8
2019	131	50.8
2020	131	45.6
2021	33	45.6
2022	33	45.6
2023	39	45.6
2024	20	45.6
2025	45	45.6
2026	18	45.6

For each year, a bar from the first to the last day at Hilo Intl AP 87 meeting 30 C (86 F).

First to last qualifying date each year at Hilo Intl AP 87
Year	First date	Last date
1950	1950-01-11	1950-11-30
1951	1951-03-09	1951-09-22
1952	1952-07-15	1952-10-17
1953	1953-08-15	1953-08-23
1954	1954-01-18	1954-09-11
1955	1955-03-22	1955-11-09
1956	1956-01-13	1956-11-30
1957	1957-04-15	1957-10-27
1958	1958-01-03	1958-10-22
1959	1959-01-17	1959-10-06
1960	1960-02-05	1960-10-18
1961	1961-01-16	1961-10-31
1962	1962-01-06	1962-10-29
1963	1963-01-16	1963-11-23
1964	1964-06-20	1964-12-23
1965	1965-05-08	1965-11-10
1966	1966-01-05	1966-12-06
1967	1967-01-24	1967-12-17
1968	1968-01-21	1968-12-24
1969	1969-01-08	1969-11-30
1970	1970-01-13	1970-11-28
1971	1971-01-16	1971-10-25
1972	1972-03-01	1972-12-18
1973	1973-01-06	1973-12-31
1974	1974-01-03	1974-10-21
1975	1975-02-02	1975-09-03
1976	1976-08-17	1976-11-02
1977	1977-01-10	1977-12-12
1978	1978-02-28	1978-12-04
1979	1979-01-07	1979-12-15
1980	1980-01-11	1980-12-25
1981	1981-01-06	1981-09-22
1982	1982-02-13	1982-08-19
1983	1983-01-23	1983-03-11
1984	1984-10-04	1984-10-23
1985	1985-08-11	1985-11-18
1986	1986-02-09	1986-10-18
1987	1987-06-04	1987-11-11
1988	1988-06-29	1988-12-08
1989	1989-02-13	1989-11-29
1990	1990-08-13	1990-11-26
1991	1991-01-27	1991-11-20
1992	1992-02-19	1992-12-15
1993	1993-08-01	1993-11-03
1994	1994-06-25	1994-10-24
1995	1995-01-27	1995-12-30
1996	1996-05-13	1996-12-27
1997	1997-01-14	1997-11-07
1998	1998-01-22	1998-08-11
1999	1999-10-19	1999-10-19
2000	2000-10-18	2000-10-18
2001	2001-01-02	2001-09-16
2002	2002-03-29	2002-11-10
2003	2003-01-15	2003-11-01
2004	2004-01-13	2004-11-13
2005	2005-01-16	2005-11-30
2006	2006-07-18	2006-11-05
2007	2007-03-12	2007-12-04
2008	2008-02-27	2008-09-14
2009	2009-05-31	2009-12-29
2010	2010-01-27	2010-10-01
2011	2011-08-23	2011-10-08
2012	2012-10-07	2012-10-26
2013	2013-04-14	2013-11-28
2014	2014-03-06	2014-10-24
2015	2015-01-29	2015-12-11
2016	2016-01-09	2016-09-28
2017	2017-02-06	2017-10-23
2018	2018-01-12	2018-10-31
2019	2019-02-22	2019-12-25
2020	2020-01-07	2020-12-05
2021	2021-03-24	2021-11-17
2022	2022-05-18	2022-10-20
2023	2023-01-19	2023-11-07
2024	2024-01-16	2024-10-14
2025	2025-02-26	2025-12-18
2026	2026-01-12	2026-10-09

Every Fixed Threshold

Fixed thresholds at Hilo Intl AP 87
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	77	131	2019	18
90 F (32.2 C): Days	36	12	2015	5
20 C (68 F): Tropical nights (min	77	287	2020	193
25 C (77 F): Days with min	2	2	2015	1
10 mm (0.39 in): Days with 10 mm or more rain	77	136	1990	88
25 mm (0.98 in): Days with 25 mm or more rain	77	55	1990	34
50 mm (1.97 in): Days with 50 mm or more rain	76	23	1990	12
100 mm (3.94 in): Days with 100 mm or more rain	64	12	1986	3
200 mm (7.87 in): Days with 200 mm or more rain	30	3	1979	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1950.

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Data for Hilo Intl AP 87 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).

Hilo Intl AP 87 Threshold Days by Year (USW00021504)

Key Facts for Hilo Intl AP 87 Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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