Ackerman Threshold Days by Year
6 fixed thresholds counted per year at Ackerman (USC00220039): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Ackerman Thresholds
- Ackerman: days with 10 mm (0.39 in) or more of precipitation in 64 years, most in 1974 with 57.
- Ackerman: days with 25 mm (0.98 in) or more of precipitation in 64 years, most in 1946 with 33.
- Ackerman: days with 50 mm (1.97 in) or more of precipitation in 62 years, most in 1983 with 16.
- Ackerman: days with 100 mm (3.94 in) or more of precipitation in 21 years, most in 1977 with 3.
- 6 fixed thresholds have at least one qualifying day at Ackerman.
Days with 10 mm (0.39 in) or more of precipitation
64 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1940 | 42 | 43.1 |
| 1941 | 44 | 43.1 |
| 1942 | 31 | 43.1 |
| 1943 | 30 | 43.1 |
| 1944 | 36 | 43.1 |
| 1945 | 45 | 43.1 |
| 1946 | 54 | 43.1 |
| 1947 | 52 | 43.1 |
| 1948 | 49 | 43.1 |
| 1949 | 48 | 43.1 |
| 1950 | 53 | 41.9 |
| 1951 | 44 | 41.9 |
| 1952 | 32 | 41.9 |
| 1953 | 40 | 41.9 |
| 1954 | 32 | 41.9 |
| 1955 | 39 | 41.9 |
| 1956 | 42 | 41.9 |
| 1957 | 47 | 41.9 |
| 1958 | 46 | 41.9 |
| 1959 | 44 | 41.9 |
| 1960 | 49 | 43 |
| 1961 | 52 | 43 |
| 1962 | 39 | 43 |
| 1963 | 34 | 43 |
| 1964 | 48 | 43 |
| 1965 | 41 | 43 |
| 1966 | 37 | 43 |
| 1967 | 50 | 43 |
| 1968 | 43 | 43 |
| 1969 | 37 | 43 |
| 1970 | 44 | 49.6 |
| 1971 | 55 | 49.6 |
| 1972 | 48 | 49.6 |
| 1973 | 53 | 49.6 |
| 1974 | 57 | 49.6 |
| 1975 | 52 | 49.6 |
| 1976 | 49 | 49.6 |
| 1977 | 51 | 49.6 |
| 1978 | 35 | 49.6 |
| 1979 | 52 | 49.6 |
| 1980 | 45 | 42.1 |
| 1981 | 33 | 42.1 |
| 1982 | 51 | 42.1 |
| 1983 | 52 | 42.1 |
| 1984 | 37 | 42.1 |
| 1985 | 39 | 42.1 |
| 1986 | 37 | 42.1 |
| 1987 | 35 | 42.1 |
| 1988 | 39 | 42.1 |
| 1989 | 53 | 42.1 |
| 1990 | 34 | 44.7 |
| 1991 | 42 | 44.7 |
| 1992 | 47 | 44.7 |
| 1993 | 43 | 44.7 |
| 1994 | 46 | 44.7 |
| 1995 | 45 | 44.7 |
| 1996 | 44 | 44.7 |
| 1997 | 53 | 44.7 |
| 1998 | 49 | 44.7 |
| 1999 | 44 | 44.7 |
| 2000 | 39 | 44.7 |
| 2005 | 43 | 44.7 |
| 2008 | 52 | 44.7 |
| 2011 | 42 | 42 |
| Year | First date | Last date |
|---|---|---|
| 1940 | 1940-02-17 | 1940-12-28 |
| 1941 | 1941-01-24 | 1941-12-23 |
| 1942 | 1942-01-01 | 1942-12-28 |
| 1943 | 1943-02-04 | 1943-12-28 |
| 1944 | 1944-01-02 | 1944-12-28 |
| 1945 | 1945-01-01 | 1945-12-31 |
| 1946 | 1946-01-06 | 1946-12-29 |
| 1947 | 1947-01-01 | 1947-12-16 |
| 1948 | 1948-01-01 | 1948-12-29 |
| 1949 | 1949-01-03 | 1949-12-22 |
| 1950 | 1950-01-02 | 1950-12-06 |
| 1951 | 1951-01-02 | 1951-12-21 |
| 1952 | 1952-01-05 | 1952-12-31 |
| 1953 | 1953-01-02 | 1953-12-28 |
| 1954 | 1954-01-11 | 1954-12-29 |
| 1955 | 1955-01-09 | 1955-12-02 |
| 1956 | 1956-01-19 | 1956-12-23 |
| 1957 | 1957-01-04 | 1957-12-28 |
| 1958 | 1958-01-13 | 1958-12-24 |
| 1959 | 1959-01-01 | 1959-12-28 |
| 1960 | 1960-01-01 | 1960-12-31 |
| 1961 | 1961-01-01 | 1961-12-18 |
| 1962 | 1962-01-01 | 1962-12-29 |
| 1963 | 1963-01-20 | 1963-12-23 |
| 1964 | 1964-01-07 | 1964-12-31 |
| 1965 | 1965-01-10 | 1965-12-19 |
| 1966 | 1966-01-03 | 1966-12-31 |
| 1967 | 1967-01-14 | 1967-12-31 |
| 1968 | 1968-01-04 | 1968-12-28 |
| 1969 | 1969-01-30 | 1969-12-30 |
| 1970 | 1970-01-06 | 1970-12-31 |
| 1971 | 1971-01-04 | 1971-12-17 |
| 1972 | 1972-01-02 | 1972-12-31 |
| 1973 | 1973-01-03 | 1973-12-26 |
| 1974 | 1974-01-03 | 1974-12-30 |
| 1975 | 1975-01-04 | 1975-12-30 |
| 1976 | 1976-01-03 | 1976-12-20 |
| 1977 | 1977-01-03 | 1977-12-30 |
| 1978 | 1978-01-06 | 1978-12-31 |
| 1979 | 1979-01-01 | 1979-12-24 |
| 1980 | 1980-01-04 | 1980-12-10 |
| 1981 | 1981-01-07 | 1981-12-14 |
| 1982 | 1982-01-01 | 1982-12-28 |
| 1983 | 1983-01-02 | 1983-12-28 |
| 1984 | 1984-01-10 | 1984-12-03 |
| 1985 | 1985-01-17 | 1985-12-13 |
| 1986 | 1986-02-05 | 1986-12-23 |
| 1987 | 1987-01-18 | 1987-12-28 |
| 1988 | 1988-01-02 | 1988-12-31 |
| 1989 | 1989-01-01 | 1989-12-31 |
| 1990 | 1990-01-04 | 1990-11-28 |
| 1991 | 1991-01-30 | 1991-12-14 |
| 1992 | 1992-01-12 | 1992-12-20 |
| 1993 | 1993-01-05 | 1993-12-29 |
| 1994 | 1994-01-02 | 1994-12-30 |
| 1995 | 1995-01-06 | 1995-12-20 |
| 1996 | 1996-01-02 | 1996-12-27 |
| 1997 | 1997-01-01 | 1997-12-24 |
| 1998 | 1998-01-05 | 1998-12-28 |
| 1999 | 1999-01-02 | 1999-12-21 |
| 2000 | 2000-01-04 | 2000-12-31 |
| 2005 | 2005-01-08 | 2005-12-25 |
| 2008 | 2008-01-11 | 2008-12-28 |
| 2011 | 2011-01-01 | 2011-12-27 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 10 mm (0.39 in): Days with 10 mm or more rain | 64 | 57 | 1974 | 42 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 64 | 33 | 1946 | 21 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 62 | 16 | 1983 | 9 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 21 | 3 | 1977 | 1 |
| 200 mm (7.87 in): Days with 200 mm or more rain | 1 | 1 | 1977 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 7 | 2 | 1968 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1940.
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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2025-12-31).