Mombetsu Threshold Days by Year (JA000047435)

14 fixed thresholds counted per year at Mombetsu (JA000047435): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mombetsu Thresholds

Mombetsu: days with 10 mm (0.39 in) or more of precipitation in 49 years, most in 1966 with 37.
Mombetsu: days with 25 mm (0.98 in) or more of precipitation in 49 years, most in 1975 with 12.
Mombetsu: days with a maximum temperature at or below 0 C (32 F) in 36 years, most in 1984 with 112.
Mombetsu: nights with a minimum temperature at or below 0 C (32 F) in 36 years, most in 1964 with 166.
14 fixed thresholds have at least one qualifying day at Mombetsu.

Days at or above 30 C (86 F)

33 years with a qualifying day

Days per year at Mombetsu with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 13 in 2025.

Days at or above 30 C (86 F) per year at Mombetsu
Year	Days	Decade average
1958	1	1
1960	6	2.5
1961	4	2.5
1962	1	2.5
1963	5	2.5
1964	1	2.5
1965	1	2.5
1966	1	2.5
1967	3	2.5
1968	1	2.5
1969	2	2.5
1970	4	4.3
1971	1	4.3
1972	8	4.3
1973	3	4.3
1974	1	4.3
1975	5	4.3
1976	4	4.3
1977	3	4.3
1978	10	4.3
1979	4	4.3
1980	1	3.9
1981	5	3.9
1982	4	3.9
1983	2	3.9
1984	8	3.9
1985	3	3.9
1986	5	3.9
1987	1	3.9
1988	2	3.9
1989	8	3.9
2025	13	8.5
2026	4	8.5

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

First to last qualifying date each year at Mombetsu
Year	First date	Last date
1958	1958-08-10	1958-08-10
1960	1960-07-18	1960-09-22
1961	1961-06-03	1961-09-09
1962	1962-07-12	1962-07-12
1963	1963-07-13	1963-07-31
1964	1964-06-25	1964-06-25
1965	1965-08-28	1965-08-28
1966	1966-08-29	1966-08-29
1967	1967-07-23	1967-08-24
1968	1968-07-26	1968-07-26
1969	1969-07-18	1969-08-04
1970	1970-07-26	1970-08-23
1971	1971-08-02	1971-08-02
1972	1972-05-25	1972-09-05
1973	1973-07-15	1973-08-12
1974	1974-08-04	1974-08-04
1975	1975-07-20	1975-09-02
1976	1976-07-23	1976-07-26
1977	1977-07-24	1977-07-26
1978	1978-06-25	1978-08-21
1979	1979-06-20	1979-08-18
1980	1980-06-06	1980-06-06
1981	1981-07-17	1981-08-03
1982	1982-07-10	1982-08-29
1983	1983-08-05	1983-08-17
1984	1984-06-07	1984-08-20
1985	1985-07-25	1985-08-16
1986	1986-07-28	1986-08-14
1987	1987-09-06	1987-09-06
1988	1988-08-21	1988-08-22
1989	1989-07-22	1989-08-22
2025	2025-06-24	2025-08-16
2026	2026-07-16	2026-08-24

Every Fixed Threshold

Fixed thresholds at Mombetsu
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	33	13	2025	4
35 C (95 F): Days	2	3	1978	2
90 F (32.2 C): Days	17	7	1989	6
0 C (32 F): Ice days (max	36	112	1984	46
0 C (32 F): Frost days (min	36	166	1964	80
-10 C (14 F): Days with min	36	61	1969	11
-20 C (-4 F): Days with min	12	10	1978	1
20 C (68 F): Tropical nights (min	28	34	2025	15
25 C (77 F): Days with min	1	2	2025	2
10 mm (0.39 in): Days with 10 mm or more rain	49	37	1966	27
25 mm (0.98 in): Days with 25 mm or more rain	49	12	1975	18
50 mm (1.97 in): Days with 50 mm or more rain	35	3	1966	10
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1973	5
200 mm (7.87 in): Days with 200 mm or more rain	1	0	n/a	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1958.

Download the Data

Data for Mombetsu 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).

Mombetsu Threshold Days by Year (JA000047435)

Key Facts for Mombetsu Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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