Iwakuni Threshold Days by Year (JAW00043324)

14 fixed thresholds counted per year at Iwakuni (JAW00043324): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Iwakuni Thresholds

Iwakuni: days with a maximum temperature at or above 30 C (86 F) in 49 years, most in 1994 with 76.
Iwakuni: days with a maximum temperature at or above 90 F (32.2 C) in 49 years, most in 1994 with 61.
Iwakuni: nights with a minimum temperature at or below 0 C (32 F) in 49 years, most in 1984 with 64.
Iwakuni: nights with a minimum temperature at or above 20 C (68 F) in 49 years, most in 1961 with 108.
14 fixed thresholds have at least one qualifying day at Iwakuni.

Days at or above 30 C (86 F)

49 years with a qualifying day

Days per year at Iwakuni with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 76 in 1994.

Days at or above 30 C (86 F) per year at Iwakuni
Year	Days	Decade average
1955	50	43
1956	42	43
1957	31	43
1958	42	43
1959	50	43
1960	58	49.4
1961	71	49.4
1962	48	49.4
1963	40	49.4
1964	64	49.4
1965	34	49.4
1966	42	49.4
1967	62	49.4
1968	31	49.4
1969	44	49.4
1970	52	45.9
1971	36	45.9
1972	31	45.9
1973	59	45.9
1974	40	45.9
1975	68	45.9
1976	40	45.9
1977	39	45.9
1978	59	45.9
1979	35	45.9
1980	10	42.8
1981	42	42.8
1982	28	42.8
1983	56	42.8
1984	63	42.8
1985	69	42.8
1986	47	42.8
1987	37	42.8
1988	34	42.8
1989	42	42.8
1990	66	49.7
1991	47	49.7
1992	46	49.7
1993	22	49.7
1994	76	49.7
1995	54	49.7
1996	48	49.7
1997	45	49.7
1998	43	49.7
2001	47	42.4
2002	43	42.4
2003	31	42.4
2004	45	42.4
2005	46	42.4

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

First to last qualifying date each year at Iwakuni
Year	First date	Last date
1955	1955-06-24	1955-09-13
1956	1956-06-21	1956-09-06
1957	1957-07-08	1957-09-01
1958	1958-07-06	1958-09-17
1959	1959-06-16	1959-09-18
1960	1960-06-06	1960-09-24
1961	1961-06-30	1961-10-05
1962	1962-05-30	1962-09-13
1963	1963-06-23	1963-09-03
1964	1964-07-02	1964-09-19
1965	1965-07-08	1965-08-28
1966	1966-06-26	1966-09-10
1967	1967-06-18	1967-09-11
1968	1968-07-16	1968-09-09
1969	1969-06-27	1969-09-24
1970	1970-07-14	1970-09-17
1971	1971-07-03	1971-08-31
1972	1972-06-09	1972-09-06
1973	1973-06-28	1973-09-02
1974	1974-07-08	1974-09-05
1975	1975-07-03	1975-10-04
1976	1976-05-27	1976-08-24
1977	1977-07-02	1977-09-14
1978	1978-07-02	1978-09-01
1979	1979-07-11	1979-09-23
1980	1980-06-17	1980-09-05
1981	1981-06-28	1981-09-03
1982	1982-07-27	1982-09-08
1983	1983-06-29	1983-09-24
1984	1984-06-17	1984-09-03
1985	1985-07-07	1985-09-20
1986	1986-06-19	1986-09-14
1987	1987-06-04	1987-09-10
1988	1988-07-08	1988-09-12
1989	1989-07-12	1989-09-17
1990	1990-06-20	1990-09-13
1991	1991-06-26	1991-09-19
1992	1992-07-06	1992-09-08
1993	1993-06-14	1993-09-18
1994	1994-06-26	1994-09-15
1995	1995-07-08	1995-09-24
1996	1996-06-15	1996-09-02
1997	1997-06-20	1997-09-13
1998	1998-06-27	1998-09-20
2001	2001-06-26	2001-09-11
2002	2002-07-10	2002-09-13
2003	2003-07-07	2003-09-14
2004	2004-06-20	2004-09-14
2005	2005-06-28	2005-09-18

Every Fixed Threshold

Fixed thresholds at Iwakuni
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	49	76	1994	46
35 C (95 F): Days	30	12	1983	1
90 F (32.2 C): Days	49	61	1994	10
100 F (37.8 C): Days	1	1	1974	1
0 C (32 F): Ice days (max	6	1	1959	1
0 C (32 F): Frost days (min	49	64	1984	31
20 C (68 F): Tropical nights (min	49	108	1961	108
25 C (77 F): Days with min	49	44	1985	23
10 mm (0.39 in): Days with 10 mm or more rain	49	68	1980	30
25 mm (0.98 in): Days with 25 mm or more rain	49	37	1993	18
50 mm (1.97 in): Days with 50 mm or more rain	49	16	1990	5
100 mm (3.94 in): Days with 100 mm or more rain	33	4	1993	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1981	1
10 cm (3.9 in): Days with 10 cm or more snowfall	4	1	1956	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

Download the Data

Data for Iwakuni 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Iwakuni Threshold Days by Year (JAW00043324)

Key Facts for Iwakuni Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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