Rottnest Island Lighthouse Threshold Days by Year
11 fixed thresholds counted per year at Rottnest Island Lighthouse (ASN00009038): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Rottnest Island Lighthouse Thresholds
- Rottnest Island Lighthouse: days with 10 mm (0.39 in) or more of precipitation in 88 years, most in 1926 with 37.
- Rottnest Island Lighthouse: days with 25 mm (0.98 in) or more of precipitation in 86 years, most in 1934 with 11.
- Rottnest Island Lighthouse: days with a maximum temperature at or above 30 C (86 F) in 31 years, most in 1978 with 37.
- Rottnest Island Lighthouse: days with a maximum temperature at or above 35 C (95 F) in 31 years, most in 1965 with 10.
- 11 fixed thresholds have at least one qualifying day at Rottnest Island Lighthouse.
Days at or above 30 C (86 F)
31 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1965 | 23 | 22.4 |
| 1966 | 23 | 22.4 |
| 1967 | 31 | 22.4 |
| 1968 | 16 | 22.4 |
| 1969 | 19 | 22.4 |
| 1970 | 19 | 22.3 |
| 1971 | 16 | 22.3 |
| 1972 | 32 | 22.3 |
| 1973 | 17 | 22.3 |
| 1974 | 20 | 22.3 |
| 1975 | 25 | 22.3 |
| 1976 | 24 | 22.3 |
| 1977 | 17 | 22.3 |
| 1978 | 37 | 22.3 |
| 1979 | 16 | 22.3 |
| 1980 | 12 | 18.4 |
| 1981 | 20 | 18.4 |
| 1982 | 15 | 18.4 |
| 1983 | 19 | 18.4 |
| 1984 | 18 | 18.4 |
| 1985 | 21 | 18.4 |
| 1986 | 10 | 18.4 |
| 1987 | 13 | 18.4 |
| 1988 | 30 | 18.4 |
| 1989 | 26 | 18.4 |
| 1990 | 21 | 21.2 |
| 1991 | 27 | 21.2 |
| 1992 | 21 | 21.2 |
| 1993 | 13 | 21.2 |
| 1994 | 23 | 21.2 |
| 1995 | 22 | 21.2 |
| Year | First date | Last date |
|---|---|---|
| 1965 | 1965-01-01 | 1965-12-26 |
| 1966 | 1966-01-05 | 1966-12-16 |
| 1967 | 1967-01-16 | 1967-12-05 |
| 1968 | 1968-01-03 | 1968-12-31 |
| 1969 | 1969-01-03 | 1969-12-31 |
| 1970 | 1970-01-01 | 1970-12-29 |
| 1971 | 1971-01-17 | 1971-12-15 |
| 1972 | 1972-01-01 | 1972-12-11 |
| 1973 | 1973-01-05 | 1973-12-17 |
| 1974 | 1974-01-01 | 1974-12-20 |
| 1975 | 1975-01-11 | 1975-12-23 |
| 1976 | 1976-01-23 | 1976-12-27 |
| 1977 | 1977-01-23 | 1977-12-27 |
| 1978 | 1978-01-07 | 1978-12-30 |
| 1979 | 1979-01-14 | 1979-12-31 |
| 1980 | 1980-01-01 | 1980-12-17 |
| 1981 | 1981-01-05 | 1981-12-27 |
| 1982 | 1982-01-14 | 1982-12-19 |
| 1983 | 1983-01-04 | 1983-12-26 |
| 1984 | 1984-01-08 | 1984-11-14 |
| 1985 | 1985-01-05 | 1985-12-09 |
| 1986 | 1986-01-07 | 1986-03-16 |
| 1987 | 1987-01-20 | 1987-12-18 |
| 1988 | 1988-01-03 | 1988-11-10 |
| 1989 | 1989-01-04 | 1989-12-26 |
| 1990 | 1990-01-08 | 1990-12-12 |
| 1991 | 1991-01-06 | 1991-12-21 |
| 1992 | 1992-01-04 | 1992-12-17 |
| 1993 | 1993-01-05 | 1993-12-27 |
| 1994 | 1994-01-20 | 1994-12-30 |
| 1995 | 1995-01-18 | 1995-11-14 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 31 | 37 | 1978 | 22 |
| 35 C (95 F): Days | 31 | 10 | 1965 | 3 |
| 40 C (104 F): Days | 8 | 1 | 1965 | 1 |
| 90 F (32.2 C): Days | 31 | 27 | 1978 | 10 |
| 100 F (37.8 C): Days | 19 | 4 | 1965 | 1 |
| 20 C (68 F): Tropical nights (min | 31 | 70 | 1978 | 42 |
| 25 C (77 F): Days with min | 11 | 2 | 1990 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 88 | 37 | 1926 | 21 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 86 | 11 | 1934 | 5 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 31 | 3 | 1986 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 2 | 1 | 1947 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1965.
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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2026-10-14).