Iida Threshold Days by Year (JA000047637)

13 fixed thresholds counted per year at Iida (JA000047637): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Iida Thresholds

Iida: days with a maximum temperature at or above 30 C (86 F) in 69 years, most in 1961 with 74.
Iida: days with a maximum temperature at or above 90 F (32.2 C) in 68 years, most in 2025 with 57.
Iida: days with 10 mm (0.39 in) or more of precipitation in 54 years, most in 2010 with 70.
Iida: days with 25 mm (0.98 in) or more of precipitation in 54 years, most in 2010 with 33.
13 fixed thresholds have at least one qualifying day at Iida.

Days at or above 30 C (86 F)

69 years with a qualifying day

Days per year at Iida with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 74 in 1961.

Days at or above 30 C (86 F) per year at Iida
Year	Days	Decade average
1951	38	40.8
1952	36	40.8
1953	25	40.8
1954	35	40.8
1955	52	40.8
1956	47	40.8
1957	35	40.8
1958	49	40.8
1959	50	40.8
1960	53	46.7
1961	74	46.7
1962	55	46.7
1963	43	46.7
1964	49	46.7
1965	40	46.7
1966	42	46.7
1967	49	46.7
1968	29	46.7
1969	33	46.7
1970	36	37.9
1971	33	37.9
1972	36	37.9
1973	47	37.9
1974	29	37.9
1975	42	37.9
1976	18	37.9
1977	42	37.9
1978	60	37.9
1979	36	37.9
1980	15	34.9
1981	30	34.9
1982	21	34.9
1983	33	34.9
1984	41	34.9
1985	49	34.9
1986	38	34.9
1987	51	34.9
1988	31	34.9
1989	40	34.9
1990	56	47.3
1991	47	47.3
1992	44	47.3
1993	18	47.3
1994	65	47.3
1996	44	47.3
1997	52	47.3
1998	52	47.3
2000	64	50.5
2002	55	50.5
2003	38	50.5
2004	48	50.5
2006	52	50.5
2007	53	50.5
2008	53	50.5
2009	41	50.5
2010	64	55.8
2011	61	55.8
2013	64	55.8
2014	38	55.8
2015	42	55.8
2016	63	55.8
2017	57	55.8
2018	60	55.8
2019	53	55.8
2020	51	54.6
2021	40	54.6
2022	60	54.6
2025	73	54.6
2026	49	54.6

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

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

Every Fixed Threshold

Fixed thresholds at Iida
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	69	74	1961	49
35 C (95 F): Days	37	22	2018	9
90 F (32.2 C): Days	68	57	2025	30
0 C (32 F): Ice days (max	48	8	1984	1
0 C (32 F): Frost days (min	41	123	1984	61
-10 C (14 F): Days with min	31	9	1963	1
20 C (68 F): Tropical nights (min	41	82	2025	65
25 C (77 F): Days with min	2	1	2025	3
10 mm (0.39 in): Days with 10 mm or more rain	54	70	2010	31
25 mm (0.98 in): Days with 25 mm or more rain	54	33	2010	28
50 mm (1.97 in): Days with 50 mm or more rain	54	10	1953	18
100 mm (3.94 in): Days with 100 mm or more rain	27	2	1958	13
200 mm (7.87 in): Days with 200 mm or more rain	3	1	1961	8

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1951.

Download the Data

Data for Iida 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).

Iida Threshold Days by Year (JA000047637)

Key Facts for Iida Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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