Jeju Threshold Days by Year (KSM00047184)

15 fixed thresholds counted per year at Jeju (KSM00047184): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Jeju Thresholds

Jeju: days with a maximum temperature at or above 30 C (86 F) in 32 years, most in 2025 with 73.
Jeju: days with a maximum temperature at or above 90 F (32.2 C) in 32 years, most in 2013 with 35.
Jeju: days with a maximum temperature at or above 35 C (95 F) in 16 years, most in 2013 with 5.
Jeju: days with a maximum temperature at or above 40 C (104 F) in 3 years, most in 1986 with 1.
15 fixed thresholds have at least one qualifying day at Jeju.

Days at or above 30 C (86 F)

32 years with a qualifying day

Days per year at Jeju with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 73 in 2025.

Days at or above 30 C (86 F) per year at Jeju
Year	Days	Decade average
1974	20	39
1975	55	39
1978	55	39
1979	26	39
1980	13	21.8
1981	43	21.8
1982	17	21.8
1983	24	21.8
1986	20	21.8
1987	18	21.8
1988	23	21.8
1989	16	21.8
1990	56	35.8
1991	20	35.8
1992	28	35.8
1994	55	35.8
1995	43	35.8
1996	35	35.8
1997	31	35.8
1998	37	35.8
1999	17	35.8
2000	38	30.7
2008	33	30.7
2009	21	30.7
2010	45	33
2011	35	33
2012	33	33
2013	54	33
2014	7	33
2015	24	33
2025	73	64.5
2026	56	64.5

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

First to last qualifying date each year at Jeju
Year	First date	Last date
1974	1974-07-19	1974-09-13
1975	1975-07-10	1975-09-20
1978	1978-06-09	1978-09-18
1979	1979-06-09	1979-09-17
1980	1980-06-14	1980-08-30
1981	1981-05-10	1981-09-24
1982	1982-07-10	1982-08-21
1983	1983-07-02	1983-09-02
1986	1986-06-24	1986-08-20
1987	1987-06-03	1987-08-30
1988	1988-06-08	1988-08-21
1989	1989-06-14	1989-09-14
1990	1990-06-10	1990-09-11
1991	1991-05-18	1991-09-05
1992	1992-06-10	1992-09-07
1994	1994-06-26	1994-09-10
1995	1995-07-09	1995-09-07
1996	1996-06-10	1996-09-15
1997	1997-06-26	1997-10-20
1998	1998-06-30	1998-08-23
1999	1999-06-12	1999-10-01
2000	2000-06-14	2000-09-02
2008	2008-07-06	2008-08-22
2009	2009-06-01	2009-08-27
2010	2010-07-03	2010-09-21
2011	2011-06-22	2011-08-17
2012	2012-06-30	2012-09-04
2013	2013-06-18	2013-08-29
2014	2014-07-08	2014-08-25
2015	2015-06-12	2015-08-15
2025	2025-06-17	2025-10-13
2026	2026-05-26	2026-09-25

Every Fixed Threshold

Fixed thresholds at Jeju
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	32	73	2025	56
35 C (95 F): Days	16	5	2013	4
40 C (104 F): Days	3	1	1986	1
90 F (32.2 C): Days	32	35	2013	36
100 F (37.8 C): Days	3	1	1986	1
110 F (43.3 C): Days	1	1	1986	1
0 C (32 F): Ice days (max	3	1	1981	1
0 C (32 F): Frost days (min	2	5	2025	2
20 C (68 F): Tropical nights (min	2	125	2025	120
25 C (77 F): Days with min	2	69	2025	56
10 mm (0.39 in): Days with 10 mm or more rain	1	0	n/a	24
25 mm (0.98 in): Days with 25 mm or more rain	1	0	n/a	15
50 mm (1.97 in): Days with 50 mm or more rain	1	0	n/a	10
100 mm (3.94 in): Days with 100 mm or more rain	1	0	n/a	6
200 mm (7.87 in): Days with 200 mm or more rain	1	0	n/a	3

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1974.

Download the Data

Data for Jeju 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).

Jeju Threshold Days by Year (KSM00047184)

Key Facts for Jeju Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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