Muroran Threshold Days by Year (JA000047423)

10 fixed thresholds counted per year at Muroran (JA000047423): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Muroran Thresholds

Muroran: days with 10 mm (0.39 in) or more of precipitation in 57 years, most in 1972 with 48.
Muroran: days with 25 mm (0.98 in) or more of precipitation in 57 years, most in 1981 with 21.
Muroran: days with 50 mm (1.97 in) or more of precipitation in 55 years, most in 1973 with 8.
Muroran: days with a maximum temperature at or below 0 C (32 F) in 41 years, most in 1984 with 79.
10 fixed thresholds have at least one qualifying day at Muroran.

Days at or above 30 C (86 F)

8 years with a qualifying day

Days per year at Muroran with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 6 in 1951.

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

First to last qualifying date each year at Muroran
Year	First date	Last date
1951	1951-08-06	1951-08-16
1971	1971-08-02	1971-08-02
1972	1972-08-06	1972-08-06
1981	1981-08-02	1981-08-03
1983	1983-08-06	1983-08-06
1985	1985-08-08	1985-08-08
1988	1988-08-03	1988-08-03
2014	2014-08-01	2014-08-02

Every Fixed Threshold

Fixed thresholds at Muroran
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	8	6	1951	2
90 F (32.2 C): Days	1	1	1951	1
0 C (32 F): Ice days (max	41	79	1984	10
0 C (32 F): Frost days (min	40	139	1984	45
-10 C (14 F): Days with min	17	5	1966	2
20 C (68 F): Tropical nights (min	39	32	1951	24
10 mm (0.39 in): Days with 10 mm or more rain	57	48	1972	16
25 mm (0.98 in): Days with 25 mm or more rain	57	21	1981	2
50 mm (1.97 in): Days with 50 mm or more rain	55	8	1973	7
100 mm (3.94 in): Days with 100 mm or more rain	10	2	1962	1

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 Muroran 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).

Muroran Threshold Days by Year (JA000047423)

Key Facts for Muroran Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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