Shonai Threshold Days by Year (JA000047587)
14 fixed thresholds counted per year at Shonai (JA000047587): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Shonai Thresholds
- Shonai: days with a maximum temperature at or above 30 C (86 F) in 20 years, most in 2025 with 45.
- Shonai: days with a maximum temperature at or above 90 F (32.2 C) in 20 years, most in 2025 with 24.
- Shonai: nights with a minimum temperature at or below 0 C (32 F) in 20 years, most in 1984 with 101.
- Shonai: nights with a minimum temperature at or above 20 C (68 F) in 20 years, most in 2025 with 88.
- 14 fixed thresholds have at least one qualifying day at Shonai.
Days at or above 30 C (86 F)
20 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1971 | 14 | 19.1 |
| 1972 | 20 | 19.1 |
| 1973 | 24 | 19.1 |
| 1974 | 14 | 19.1 |
| 1975 | 31 | 19.1 |
| 1976 | 10 | 19.1 |
| 1977 | 13 | 19.1 |
| 1978 | 36 | 19.1 |
| 1979 | 10 | 19.1 |
| 1980 | 6 | 20.4 |
| 1981 | 17 | 20.4 |
| 1982 | 11 | 20.4 |
| 1983 | 16 | 20.4 |
| 1984 | 34 | 20.4 |
| 1985 | 37 | 20.4 |
| 1986 | 17 | 20.4 |
| 1987 | 17 | 20.4 |
| 1988 | 20 | 20.4 |
| 1989 | 29 | 20.4 |
| 2025 | 45 | 45 |
| Year | First date | Last date |
|---|---|---|
| 1971 | 1971-07-07 | 1971-08-11 |
| 1972 | 1972-06-07 | 1972-09-04 |
| 1973 | 1973-07-14 | 1973-09-03 |
| 1974 | 1974-06-17 | 1974-09-03 |
| 1975 | 1975-07-16 | 1975-09-08 |
| 1976 | 1976-07-09 | 1976-09-08 |
| 1977 | 1977-07-25 | 1977-09-11 |
| 1978 | 1978-06-17 | 1978-08-21 |
| 1979 | 1979-07-23 | 1979-09-21 |
| 1980 | 1980-05-31 | 1980-09-11 |
| 1981 | 1981-07-09 | 1981-08-26 |
| 1982 | 1982-07-11 | 1982-08-29 |
| 1983 | 1983-08-06 | 1983-09-06 |
| 1984 | 1984-06-07 | 1984-08-22 |
| 1985 | 1985-07-20 | 1985-09-06 |
| 1986 | 1986-07-29 | 1986-09-02 |
| 1987 | 1987-06-07 | 1987-09-08 |
| 1988 | 1988-08-02 | 1988-08-28 |
| 1989 | 1989-07-18 | 1989-08-30 |
| 2025 | 2025-06-10 | 2025-09-04 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 20 | 45 | 2025 | 45 |
| 35 C (95 F): Days | 7 | 7 | 1985 | 4 |
| 40 C (104 F): Days | 1 | 1 | 1978 | 1 |
| 90 F (32.2 C): Days | 20 | 24 | 2025 | 24 |
| 100 F (37.8 C): Days | 1 | 1 | 1978 | 1 |
| 0 C (32 F): Ice days (max | 18 | 19 | 1977 | 1 |
| 0 C (32 F): Frost days (min | 20 | 101 | 1984 | 27 |
| -10 C (14 F): Days with min | 6 | 2 | 1976 | 1 |
| 20 C (68 F): Tropical nights (min | 20 | 88 | 2025 | 88 |
| 25 C (77 F): Days with min | 11 | 26 | 2025 | 26 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 20 | 80 | 1981 | 9 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 20 | 26 | 1973 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 19 | 9 | 1973 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 3 | 1 | 1971 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1971.
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 (2025-12-31).