Irozaki Threshold Days by Year (JA000047666)
10 fixed thresholds counted per year at Irozaki (JA000047666): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Irozaki Thresholds
- Irozaki: days with 10 mm (0.39 in) or more of precipitation in 53 years, most in 1959 with 69.
- Irozaki: days with 25 mm (0.98 in) or more of precipitation in 53 years, most in 1980 with 31.
- Irozaki: days with 50 mm (1.97 in) or more of precipitation in 53 years, most in 1982 with 14.
- Irozaki: days with a maximum temperature at or above 30 C (86 F) in 47 years, most in 2025 with 47.
- 10 fixed thresholds have at least one qualifying day at Irozaki.
Days at or above 30 C (86 F)
47 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1951 | 9 | 5.3 |
| 1952 | 7 | 5.3 |
| 1953 | 9 | 5.3 |
| 1954 | 7 | 5.3 |
| 1955 | 1 | 5.3 |
| 1956 | 7 | 5.3 |
| 1957 | 4 | 5.3 |
| 1958 | 1 | 5.3 |
| 1959 | 3 | 5.3 |
| 1960 | 7 | 5.3 |
| 1961 | 14 | 5.3 |
| 1962 | 6 | 5.3 |
| 1964 | 2 | 5.3 |
| 1965 | 1 | 5.3 |
| 1966 | 9 | 5.3 |
| 1967 | 2 | 5.3 |
| 1969 | 1 | 5.3 |
| 1970 | 1 | 8 |
| 1971 | 9 | 8 |
| 1972 | 6 | 8 |
| 1973 | 11 | 8 |
| 1975 | 8 | 8 |
| 1976 | 4 | 8 |
| 1977 | 3 | 8 |
| 1978 | 22 | 8 |
| 1979 | 8 | 8 |
| 1980 | 2 | 6.7 |
| 1981 | 5 | 6.7 |
| 1982 | 3 | 6.7 |
| 1983 | 11 | 6.7 |
| 1984 | 8 | 6.7 |
| 1985 | 10 | 6.7 |
| 1986 | 2 | 6.7 |
| 1987 | 17 | 6.7 |
| 1988 | 1 | 6.7 |
| 1989 | 8 | 6.7 |
| 2005 | 9 | 13.8 |
| 2007 | 17 | 13.8 |
| 2008 | 28 | 13.8 |
| 2009 | 1 | 13.8 |
| 2010 | 38 | 20.4 |
| 2011 | 25 | 20.4 |
| 2012 | 26 | 20.4 |
| 2014 | 1 | 20.4 |
| 2017 | 12 | 20.4 |
| 2025 | 47 | 31.5 |
| 2026 | 16 | 31.5 |
| Year | First date | Last date |
|---|---|---|
| 1951 | 1951-08-09 | 1951-08-28 |
| 1952 | 1952-08-03 | 1952-08-30 |
| 1953 | 1953-07-26 | 1953-08-22 |
| 1954 | 1954-08-09 | 1954-08-24 |
| 1955 | 1955-08-09 | 1955-08-09 |
| 1956 | 1956-07-30 | 1956-08-16 |
| 1957 | 1957-07-31 | 1957-08-25 |
| 1958 | 1958-08-23 | 1958-08-23 |
| 1959 | 1959-08-05 | 1959-08-29 |
| 1960 | 1960-07-15 | 1960-08-21 |
| 1961 | 1961-07-11 | 1961-09-15 |
| 1962 | 1962-08-07 | 1962-08-21 |
| 1964 | 1964-08-16 | 1964-08-17 |
| 1965 | 1965-08-13 | 1965-08-13 |
| 1966 | 1966-07-27 | 1966-09-11 |
| 1967 | 1967-08-05 | 1967-08-17 |
| 1969 | 1969-08-14 | 1969-08-14 |
| 1970 | 1970-09-02 | 1970-09-02 |
| 1971 | 1971-07-29 | 1971-08-29 |
| 1972 | 1972-08-04 | 1972-09-08 |
| 1973 | 1973-07-18 | 1973-09-03 |
| 1975 | 1975-07-18 | 1975-08-05 |
| 1976 | 1976-08-21 | 1976-08-24 |
| 1977 | 1977-08-04 | 1977-09-12 |
| 1978 | 1978-07-07 | 1978-08-30 |
| 1979 | 1979-08-06 | 1979-08-27 |
| 1980 | 1980-07-23 | 1980-09-06 |
| 1981 | 1981-08-05 | 1981-09-04 |
| 1982 | 1982-08-21 | 1982-08-24 |
| 1983 | 1983-08-06 | 1983-09-07 |
| 1984 | 1984-08-02 | 1984-08-27 |
| 1985 | 1985-07-29 | 1985-09-05 |
| 1986 | 1986-07-30 | 1986-08-13 |
| 1987 | 1987-07-17 | 1987-09-17 |
| 1988 | 1988-08-31 | 1988-08-31 |
| 1989 | 1989-08-07 | 1989-09-01 |
| 2005 | 2005-08-03 | 2005-08-21 |
| 2007 | 2007-08-01 | 2007-09-18 |
| 2008 | 2008-07-17 | 2008-09-06 |
| 2009 | 2009-08-11 | 2009-08-11 |
| 2010 | 2010-07-17 | 2010-09-07 |
| 2011 | 2011-06-29 | 2011-09-18 |
| 2012 | 2012-07-17 | 2012-09-13 |
| 2014 | 2014-08-18 | 2014-08-18 |
| 2017 | 2017-07-18 | 2017-08-30 |
| 2025 | 2025-07-04 | 2025-09-17 |
| 2026 | 2026-07-15 | 2026-09-08 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 47 | 47 | 2025 | 16 |
| 90 F (32.2 C): Days | 5 | 5 | 2025 | 1 |
| 0 C (32 F): Frost days (min | 12 | 5 | 1967 | 1 |
| 20 C (68 F): Tropical nights (min | 41 | 121 | 2025 | 115 |
| 25 C (77 F): Days with min | 38 | 62 | 2025 | 37 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 53 | 69 | 1959 | 31 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 53 | 31 | 1980 | 24 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 53 | 14 | 1982 | 12 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 37 | 5 | 1958 | 8 |
| 200 mm (7.87 in): Days with 200 mm or more rain | 5 | 1 | 1970 | 6 |
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
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 . Last revised (2026-10-17).