Hiroo Threshold Days by Year (JA000047440)
14 fixed thresholds counted per year at Hiroo (JA000047440): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Hiroo Thresholds
- Hiroo: days with 10 mm (0.39 in) or more of precipitation in 46 years, most in 1958 with 53.
- Hiroo: days with 25 mm (0.98 in) or more of precipitation in 46 years, most in 1971 with 27.
- Hiroo: days with 50 mm (1.97 in) or more of precipitation in 46 years, most in 1958 with 15.
- Hiroo: days with 100 mm (3.94 in) or more of precipitation in 36 years, most in 1958 with 7.
- 14 fixed thresholds have at least one qualifying day at Hiroo.
Days at or above 30 C (86 F)
34 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1958 | 3 | 3 |
| 1960 | 8 | 3.1 |
| 1961 | 2 | 3.1 |
| 1962 | 3 | 3.1 |
| 1963 | 5 | 3.1 |
| 1964 | 3 | 3.1 |
| 1965 | 2 | 3.1 |
| 1966 | 3 | 3.1 |
| 1967 | 2 | 3.1 |
| 1968 | 2 | 3.1 |
| 1969 | 1 | 3.1 |
| 1970 | 6 | 5 |
| 1971 | 4 | 5 |
| 1972 | 8 | 5 |
| 1973 | 7 | 5 |
| 1974 | 1 | 5 |
| 1975 | 4 | 5 |
| 1976 | 4 | 5 |
| 1977 | 4 | 5 |
| 1978 | 9 | 5 |
| 1979 | 3 | 5 |
| 1980 | 1 | 3.3 |
| 1981 | 4 | 3.3 |
| 1982 | 1 | 3.3 |
| 1983 | 2 | 3.3 |
| 1984 | 6 | 3.3 |
| 1985 | 6 | 3.3 |
| 1986 | 4 | 3.3 |
| 1987 | 3 | 3.3 |
| 1988 | 1 | 3.3 |
| 1989 | 5 | 3.3 |
| 2014 | 4 | 4 |
| 2025 | 9 | 6 |
| 2026 | 3 | 6 |
| Year | First date | Last date |
|---|---|---|
| 1958 | 1958-06-27 | 1958-08-11 |
| 1960 | 1960-07-19 | 1960-08-09 |
| 1961 | 1961-07-27 | 1961-08-14 |
| 1962 | 1962-08-14 | 1962-08-17 |
| 1963 | 1963-07-27 | 1963-07-31 |
| 1964 | 1964-07-25 | 1964-08-08 |
| 1965 | 1965-08-19 | 1965-08-28 |
| 1966 | 1966-08-28 | 1966-09-01 |
| 1967 | 1967-07-16 | 1967-07-23 |
| 1968 | 1968-07-23 | 1968-07-26 |
| 1969 | 1969-07-18 | 1969-07-18 |
| 1970 | 1970-07-22 | 1970-08-23 |
| 1971 | 1971-07-30 | 1971-08-06 |
| 1972 | 1972-05-25 | 1972-09-05 |
| 1973 | 1973-07-15 | 1973-08-16 |
| 1974 | 1974-08-04 | 1974-08-04 |
| 1975 | 1975-07-24 | 1975-09-02 |
| 1976 | 1976-07-23 | 1976-07-29 |
| 1977 | 1977-07-25 | 1977-08-03 |
| 1978 | 1978-07-11 | 1978-08-07 |
| 1979 | 1979-07-31 | 1979-08-13 |
| 1980 | 1980-06-06 | 1980-06-06 |
| 1981 | 1981-07-18 | 1981-08-03 |
| 1982 | 1982-07-10 | 1982-07-10 |
| 1983 | 1983-08-06 | 1983-08-07 |
| 1984 | 1984-08-02 | 1984-08-17 |
| 1985 | 1985-08-04 | 1985-08-18 |
| 1986 | 1986-07-28 | 1986-07-31 |
| 1987 | 1987-06-07 | 1987-07-29 |
| 1988 | 1988-08-26 | 1988-08-26 |
| 1989 | 1989-07-22 | 1989-08-23 |
| 2014 | 2014-07-30 | 2014-08-04 |
| 2025 | 2025-06-24 | 2025-08-21 |
| 2026 | 2026-06-02 | 2026-08-20 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 34 | 9 | 1978 | 3 |
| 35 C (95 F): Days | 2 | 1 | 1985 | 1 |
| 90 F (32.2 C): Days | 20 | 4 | 2025 | 4 |
| 0 C (32 F): Ice days (max | 35 | 83 | 1984 | 26 |
| 0 C (32 F): Frost days (min | 34 | 171 | 1980 | 76 |
| -10 C (14 F): Days with min | 34 | 67 | 1969 | 11 |
| -20 C (-4 F): Days with min | 12 | 3 | 1967 | 1 |
| 20 C (68 F): Tropical nights (min | 21 | 27 | 2025 | 5 |
| 25 C (77 F): Days with min | 3 | 2 | 1960 | 2 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 46 | 53 | 1958 | 43 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 46 | 27 | 1971 | 33 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 46 | 15 | 1958 | 23 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 36 | 7 | 1958 | 12 |
| 200 mm (7.87 in): Days with 200 mm or more rain | 5 | 1 | 1964 | 6 |
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
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).