Altona Threshold Days by Year (CA005020040)
16 fixed thresholds counted per year at Altona (CA005020040): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Altona Thresholds
- Altona: days with a maximum temperature at or above 30 C (86 F) in 24 years, most in 1980 with 31.
- Altona: days with a maximum temperature at or above 90 F (32.2 C) in 24 years, most in 1952 with 18.
- Altona: days with a maximum temperature at or below 0 C (32 F) in 24 years, most in 1950 with 142.
- Altona: nights with a minimum temperature at or below 0 C (32 F) in 24 years, most in 1966 with 204.
- 16 fixed thresholds have at least one qualifying day at Altona.
Days at or above 30 C (86 F)
24 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1950 | 15 | 18.7 |
| 1951 | 12 | 18.7 |
| 1952 | 29 | 18.7 |
| 1963 | 22 | 16.1 |
| 1964 | 15 | 16.1 |
| 1965 | 8 | 16.1 |
| 1966 | 21 | 16.1 |
| 1967 | 19 | 16.1 |
| 1968 | 7 | 16.1 |
| 1969 | 21 | 16.1 |
| 1970 | 28 | 20.3 |
| 1971 | 13 | 20.3 |
| 1972 | 21 | 20.3 |
| 1973 | 14 | 20.3 |
| 1974 | 24 | 20.3 |
| 1975 | 18 | 20.3 |
| 1976 | 29 | 20.3 |
| 1977 | 17 | 20.3 |
| 1978 | 27 | 20.3 |
| 1979 | 12 | 20.3 |
| 1980 | 31 | 19 |
| 1981 | 15 | 19 |
| 1982 | 8 | 19 |
| 1983 | 22 | 19 |
| Year | First date | Last date |
|---|---|---|
| 1950 | 1950-06-04 | 1950-09-25 |
| 1951 | 1951-05-23 | 1951-08-04 |
| 1952 | 1952-04-26 | 1952-09-27 |
| 1963 | 1963-05-30 | 1963-09-30 |
| 1964 | 1964-05-21 | 1964-08-05 |
| 1965 | 1965-07-21 | 1965-08-23 |
| 1966 | 1966-05-21 | 1966-09-12 |
| 1967 | 1967-06-03 | 1967-09-07 |
| 1968 | 1968-06-03 | 1968-09-14 |
| 1969 | 1969-05-14 | 1969-09-14 |
| 1970 | 1970-05-17 | 1970-09-19 |
| 1971 | 1971-06-03 | 1971-09-03 |
| 1972 | 1972-05-15 | 1972-08-30 |
| 1973 | 1973-05-17 | 1973-08-30 |
| 1974 | 1974-06-03 | 1974-09-26 |
| 1975 | 1975-06-25 | 1975-09-14 |
| 1976 | 1976-05-09 | 1976-09-30 |
| 1977 | 1977-04-30 | 1977-08-09 |
| 1978 | 1978-05-25 | 1978-09-10 |
| 1979 | 1979-06-13 | 1979-09-16 |
| 1980 | 1980-04-20 | 1980-09-07 |
| 1981 | 1981-05-21 | 1981-09-10 |
| 1982 | 1982-07-03 | 1982-09-10 |
| 1983 | 1983-06-10 | 1983-09-02 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 24 | 31 | 1980 | 22 |
| 35 C (95 F): Days | 16 | 5 | 1983 | 5 |
| 90 F (32.2 C): Days | 24 | 18 | 1952 | 14 |
| 100 F (37.8 C): Days | 4 | 1 | 1951 | 1 |
| 0 C (32 F): Ice days (max | 24 | 142 | 1950 | 112 |
| 0 C (32 F): Frost days (min | 24 | 204 | 1966 | 194 |
| -10 C (14 F): Days with min | 24 | 130 | 1950 | 93 |
| -20 C (-4 F): Days with min | 24 | 80 | 1978 | 37 |
| -30 C (-22 F): Days with min | 24 | 31 | 1979 | 8 |
| -40 C (-40 F): Days with min | 1 | 3 | 1966 | 3 |
| 20 C (68 F): Tropical nights (min | 15 | 6 | 1966 | 5 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 22 | 21 | 1965 | 9 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 21 | 5 | 1973 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 9 | 2 | 1978 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 1 | 1 | 1970 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 20 | 5 | 1966 | 2 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1950.
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).