Irwin Threshold Days by Year (USC00333987)
17 fixed thresholds counted per year at Irwin (USC00333987): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Irwin Thresholds
- Irwin: nights with a minimum temperature at or below 0 C (32 F) in 56 years, most in 1989 with 158.
- Irwin: nights with a minimum temperature at or below -10 C (14 F) in 56 years, most in 1978 with 55.
- Irwin: nights with a minimum temperature at or above 20 C (68 F) in 56 years, most in 1949 with 19.
- Irwin: days with a maximum temperature at or above 30 C (86 F) in 55 years, most in 1991 with 94.
- 17 fixed thresholds have at least one qualifying day at Irwin.
Days at or above 30 C (86 F)
55 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1942 | 65 | 57.9 |
| 1943 | 56 | 57.9 |
| 1944 | 71 | 57.9 |
| 1945 | 49 | 57.9 |
| 1946 | 46 | 57.9 |
| 1947 | 50 | 57.9 |
| 1948 | 53 | 57.9 |
| 1949 | 73 | 57.9 |
| 1950 | 35 | 54.5 |
| 1951 | 54 | 54.5 |
| 1952 | 71 | 54.5 |
| 1953 | 75 | 54.5 |
| 1954 | 56 | 54.5 |
| 1955 | 78 | 54.5 |
| 1956 | 38 | 54.5 |
| 1957 | 44 | 54.5 |
| 1958 | 22 | 54.5 |
| 1959 | 72 | 54.5 |
| 1960 | 44 | 46.9 |
| 1961 | 38 | 46.9 |
| 1962 | 51 | 46.9 |
| 1963 | 41 | 46.9 |
| 1964 | 57 | 46.9 |
| 1965 | 50 | 46.9 |
| 1966 | 56 | 46.9 |
| 1967 | 35 | 46.9 |
| 1968 | 50 | 46.9 |
| 1969 | 47 | 46.9 |
| 1970 | 59 | 44.7 |
| 1971 | 50 | 44.7 |
| 1972 | 39 | 44.7 |
| 1973 | 40 | 44.7 |
| 1974 | 38 | 44.7 |
| 1975 | 54 | 44.7 |
| 1976 | 31 | 44.7 |
| 1977 | 54 | 44.7 |
| 1978 | 57 | 44.7 |
| 1979 | 25 | 44.7 |
| 1980 | 45 | 45.7 |
| 1981 | 21 | 45.7 |
| 1982 | 36 | 45.7 |
| 1983 | 77 | 45.7 |
| 1984 | 39 | 45.7 |
| 1985 | 39 | 45.7 |
| 1986 | 43 | 45.7 |
| 1987 | 56 | 45.7 |
| 1988 | 65 | 45.7 |
| 1989 | 36 | 45.7 |
| 1990 | 38 | 54.3 |
| 1991 | 94 | 54.3 |
| 1992 | 21 | 54.3 |
| 1993 | 56 | 54.3 |
| 1995 | 64 | 54.3 |
| 1996 | 60 | 54.3 |
| 1997 | 47 | 54.3 |
| Year | First date | Last date |
|---|---|---|
| 1942 | 1942-04-26 | 1942-09-19 |
| 1943 | 1943-06-02 | 1943-09-04 |
| 1944 | 1944-05-20 | 1944-09-20 |
| 1945 | 1945-06-01 | 1945-09-24 |
| 1946 | 1946-06-08 | 1946-10-07 |
| 1947 | 1947-06-10 | 1947-10-23 |
| 1948 | 1948-04-26 | 1948-09-19 |
| 1949 | 1949-05-04 | 1949-10-09 |
| 1950 | 1950-05-04 | 1950-09-01 |
| 1951 | 1951-05-01 | 1951-10-05 |
| 1952 | 1952-05-05 | 1952-10-01 |
| 1953 | 1953-05-25 | 1953-10-21 |
| 1954 | 1954-05-28 | 1954-09-29 |
| 1955 | 1955-05-03 | 1955-09-20 |
| 1956 | 1956-05-13 | 1956-09-13 |
| 1957 | 1957-05-13 | 1957-09-02 |
| 1958 | 1958-06-05 | 1958-09-06 |
| 1959 | 1959-05-02 | 1959-10-04 |
| 1960 | 1960-04-23 | 1960-09-25 |
| 1961 | 1961-06-01 | 1961-09-24 |
| 1962 | 1962-04-30 | 1962-09-13 |
| 1963 | 1963-05-09 | 1963-10-07 |
| 1964 | 1964-05-19 | 1964-09-21 |
| 1965 | 1965-05-07 | 1965-09-20 |
| 1966 | 1966-06-09 | 1966-09-04 |
| 1967 | 1967-05-27 | 1967-09-16 |
| 1968 | 1968-06-06 | 1968-09-23 |
| 1969 | 1969-05-06 | 1969-09-07 |
| 1970 | 1970-05-20 | 1970-09-25 |
| 1971 | 1971-05-19 | 1971-10-03 |
| 1972 | 1972-05-06 | 1972-09-18 |
| 1973 | 1973-06-03 | 1973-09-27 |
| 1974 | 1974-05-14 | 1974-08-27 |
| 1975 | 1975-05-19 | 1975-08-29 |
| 1976 | 1976-04-18 | 1976-09-08 |
| 1977 | 1977-05-16 | 1977-09-05 |
| 1978 | 1978-05-26 | 1978-09-21 |
| 1979 | 1979-05-08 | 1979-09-05 |
| 1980 | 1980-05-29 | 1980-09-22 |
| 1981 | 1981-06-14 | 1981-08-05 |
| 1982 | 1982-05-06 | 1982-10-06 |
| 1983 | 1983-06-11 | 1983-09-20 |
| 1984 | 1984-06-05 | 1984-09-22 |
| 1985 | 1985-04-21 | 1985-09-22 |
| 1986 | 1986-04-26 | 1986-09-30 |
| 1987 | 1987-05-17 | 1987-09-27 |
| 1988 | 1988-05-15 | 1988-08-19 |
| 1989 | 1989-05-30 | 1989-09-09 |
| 1990 | 1990-04-25 | 1990-09-07 |
| 1991 | 1991-05-11 | 1991-09-17 |
| 1992 | 1992-05-22 | 1992-09-15 |
| 1993 | 1993-05-09 | 1993-09-14 |
| 1995 | 1995-06-07 | 1995-09-28 |
| 1996 | 1996-05-18 | 1996-09-11 |
| 1997 | 1997-06-20 | 1997-10-12 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 55 | 94 | 1991 | 47 |
| 35 C (95 F): Days | 36 | 16 | 1955 | 1 |
| 90 F (32.2 C): Days | 55 | 53 | 1988 | 18 |
| 100 F (37.8 C): Days | 8 | 4 | 1988 | 4 |
| 0 C (32 F): Ice days (max | 55 | 57 | 1978 | 11 |
| 0 C (32 F): Frost days (min | 56 | 158 | 1989 | 99 |
| -10 C (14 F): Days with min | 56 | 55 | 1978 | 20 |
| -20 C (-4 F): Days with min | 48 | 16 | 1963 | 3 |
| -30 C (-22 F): Days with min | 3 | 2 | 1985 | 2 |
| 20 C (68 F): Tropical nights (min | 56 | 19 | 1949 | 9 |
| 25 C (77 F): Days with min | 1 | 1 | 1978 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 55 | 47 | 1948 | 38 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 55 | 15 | 1948 | 12 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 38 | 4 | 1979 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 4 | 1 | 1959 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 39 | 5 | 1951 | 2 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 1 | 1 | 1950 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1942.
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).