Mammoth Cave Threshold Days by Year (USC00155097)
17 fixed thresholds counted per year at Mammoth Cave (USC00155097): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Mammoth Cave Thresholds
- Mammoth Cave: days with 10 mm (0.39 in) or more of precipitation in 82 years, most in 1950 with 65.
- Mammoth Cave: days with 25 mm (0.98 in) or more of precipitation in 82 years, most in 2019 with 26.
- Mammoth Cave: days with a maximum temperature at or above 30 C (86 F) in 81 years, most in 2018 with 128.
- Mammoth Cave: days with a maximum temperature at or below 0 C (32 F) in 81 years, most in 1936 with 29.
- 17 fixed thresholds have at least one qualifying day at Mammoth Cave.
Days at or above 30 C (86 F)
81 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1935 | 71 | 78.8 |
| 1936 | 113 | 78.8 |
| 1937 | 50 | 78.8 |
| 1938 | 69 | 78.8 |
| 1939 | 91 | 78.8 |
| 1940 | 73 | 75.6 |
| 1941 | 93 | 75.6 |
| 1942 | 80 | 75.6 |
| 1943 | 79 | 75.6 |
| 1944 | 97 | 75.6 |
| 1945 | 67 | 75.6 |
| 1946 | 53 | 75.6 |
| 1947 | 77 | 75.6 |
| 1948 | 65 | 75.6 |
| 1949 | 72 | 75.6 |
| 1950 | 30 | 84.7 |
| 1951 | 79 | 84.7 |
| 1952 | 112 | 84.7 |
| 1953 | 121 | 84.7 |
| 1954 | 103 | 84.7 |
| 1955 | 91 | 84.7 |
| 1956 | 86 | 84.7 |
| 1957 | 75 | 84.7 |
| 1958 | 63 | 84.7 |
| 1959 | 87 | 84.7 |
| 1960 | 50 | 57.4 |
| 1961 | 30 | 57.4 |
| 1962 | 72 | 57.4 |
| 1963 | 55 | 57.4 |
| 1964 | 75 | 57.4 |
| 1965 | 52 | 57.4 |
| 1966 | 58 | 57.4 |
| 1967 | 30 | 57.4 |
| 1968 | 71 | 57.4 |
| 1969 | 81 | 57.4 |
| 1970 | 73 | 65.5 |
| 1971 | 68 | 65.5 |
| 1972 | 66 | 65.5 |
| 1973 | 77 | 65.5 |
| 1974 | 40 | 65.5 |
| 1975 | 76 | 65.5 |
| 1976 | 37 | 65.5 |
| 1977 | 76 | 65.5 |
| 1978 | 82 | 65.5 |
| 1979 | 60 | 65.5 |
| 1980 | 101 | 78.1 |
| 1981 | 66 | 78.1 |
| 1983 | 89 | 78.1 |
| 1984 | 77 | 78.1 |
| 1985 | 66 | 78.1 |
| 1986 | 82 | 78.1 |
| 1987 | 88 | 78.1 |
| 1988 | 76 | 78.1 |
| 1989 | 58 | 78.1 |
| 1995 | 75 | 76.4 |
| 1996 | 65 | 76.4 |
| 1997 | 55 | 76.4 |
| 1998 | 92 | 76.4 |
| 1999 | 95 | 76.4 |
| 2000 | 82 | 89.4 |
| 2001 | 77 | 89.4 |
| 2002 | 113 | 89.4 |
| 2004 | 97 | 89.4 |
| 2009 | 78 | 89.4 |
| 2010 | 125 | 111.3 |
| 2011 | 107 | 111.3 |
| 2012 | 99 | 111.3 |
| 2013 | 79 | 111.3 |
| 2014 | 108 | 111.3 |
| 2015 | 105 | 111.3 |
| 2016 | 125 | 111.3 |
| 2017 | 113 | 111.3 |
| 2018 | 128 | 111.3 |
| 2019 | 124 | 111.3 |
| 2020 | 97 | 105 |
| 2021 | 104 | 105 |
| 2022 | 107 | 105 |
| 2023 | 89 | 105 |
| 2024 | 109 | 105 |
| 2025 | 111 | 105 |
| 2026 | 118 | 105 |
| Year | First date | Last date |
|---|---|---|
| 1935 | 1935-04-27 | 1935-10-17 |
| 1936 | 1936-04-15 | 1936-10-05 |
| 1937 | 1937-04-04 | 1937-09-22 |
| 1938 | 1938-04-19 | 1938-10-05 |
| 1939 | 1939-05-18 | 1939-10-10 |
| 1940 | 1940-04-02 | 1940-10-28 |
| 1941 | 1941-05-15 | 1941-10-07 |
| 1942 | 1942-04-29 | 1942-10-03 |
| 1943 | 1943-05-05 | 1943-09-02 |
| 1944 | 1944-05-11 | 1944-09-21 |
| 1945 | 1945-05-20 | 1945-09-29 |
| 1946 | 1946-04-02 | 1946-09-27 |
| 1947 | 1947-05-14 | 1947-10-16 |
| 1948 | 1948-04-25 | 1948-09-21 |
| 1949 | 1949-05-04 | 1949-10-09 |
| 1950 | 1950-05-04 | 1950-08-17 |
| 1951 | 1951-04-28 | 1951-10-05 |
| 1952 | 1952-05-01 | 1952-10-01 |
| 1953 | 1953-05-21 | 1953-10-23 |
| 1954 | 1954-05-30 | 1954-10-05 |
| 1955 | 1955-04-17 | 1955-09-29 |
| 1956 | 1956-05-12 | 1956-10-02 |
| 1957 | 1957-05-01 | 1957-09-21 |
| 1958 | 1958-05-15 | 1958-09-26 |
| 1959 | 1959-05-01 | 1959-10-06 |
| 1960 | 1960-04-16 | 1960-09-09 |
| 1961 | 1961-06-01 | 1961-09-25 |
| 1962 | 1962-04-30 | 1962-09-13 |
| 1963 | 1963-03-31 | 1963-10-22 |
| 1964 | 1964-04-19 | 1964-09-11 |
| 1965 | 1965-04-23 | 1965-09-21 |
| 1966 | 1966-05-08 | 1966-09-10 |
| 1967 | 1967-05-25 | 1967-09-20 |
| 1968 | 1968-05-02 | 1968-10-02 |
| 1969 | 1969-05-29 | 1969-10-12 |
| 1970 | 1970-04-30 | 1970-09-24 |
| 1971 | 1971-06-03 | 1971-10-04 |
| 1972 | 1972-05-25 | 1972-09-22 |
| 1973 | 1973-06-03 | 1973-10-04 |
| 1974 | 1974-05-18 | 1974-08-28 |
| 1975 | 1975-05-21 | 1975-10-13 |
| 1976 | 1976-05-06 | 1976-08-28 |
| 1977 | 1977-04-11 | 1977-09-10 |
| 1978 | 1978-04-09 | 1978-09-21 |
| 1979 | 1979-05-08 | 1979-09-18 |
| 1980 | 1980-04-22 | 1980-10-10 |
| 1981 | 1981-06-05 | 1981-09-13 |
| 1983 | 1983-05-11 | 1983-10-04 |
| 1984 | 1984-05-25 | 1984-09-22 |
| 1985 | 1985-04-21 | 1985-09-16 |
| 1986 | 1986-04-25 | 1986-10-02 |
| 1987 | 1987-04-21 | 1987-09-19 |
| 1988 | 1988-04-05 | 1988-09-23 |
| 1989 | 1989-04-25 | 1989-09-13 |
| 1995 | 1995-04-10 | 1995-09-20 |
| 1996 | 1996-05-05 | 1996-09-10 |
| 1997 | 1997-05-19 | 1997-10-08 |
| 1998 | 1998-04-13 | 1998-09-30 |
| 1999 | 1999-05-17 | 1999-09-28 |
| 2000 | 2000-05-11 | 2000-11-01 |
| 2001 | 2001-05-04 | 2001-09-09 |
| 2002 | 2002-04-15 | 2002-10-03 |
| 2004 | 2004-05-06 | 2004-09-24 |
| 2009 | 2009-04-24 | 2009-09-14 |
| 2010 | 2010-04-05 | 2010-10-18 |
| 2011 | 2011-04-09 | 2011-10-08 |
| 2012 | 2012-04-03 | 2012-09-13 |
| 2013 | 2013-04-17 | 2013-10-06 |
| 2014 | 2014-05-05 | 2014-10-03 |
| 2015 | 2015-05-05 | 2015-10-08 |
| 2016 | 2016-04-26 | 2016-11-02 |
| 2017 | 2017-04-14 | 2017-10-10 |
| 2018 | 2018-05-04 | 2018-10-10 |
| 2019 | 2019-04-30 | 2019-10-06 |
| 2020 | 2020-05-16 | 2020-10-23 |
| 2021 | 2021-05-20 | 2021-10-15 |
| 2022 | 2022-05-11 | 2022-09-22 |
| 2023 | 2023-05-15 | 2023-10-05 |
| 2024 | 2024-04-17 | 2024-10-07 |
| 2025 | 2025-04-21 | 2025-10-19 |
| 2026 | 2026-03-22 | 2026-10-14 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 81 | 128 | 2018 | 118 |
| 35 C (95 F): Days | 67 | 47 | 1952 | 29 |
| 40 C (104 F): Days | 8 | 7 | 2012 | 7 |
| 90 F (32.2 C): Days | 80 | 99 | 2019 | 73 |
| 100 F (37.8 C): Days | 24 | 24 | 1936 | 4 |
| 0 C (32 F): Ice days (max | 81 | 29 | 1936 | 5 |
| 0 C (32 F): Frost days (min | 80 | 125 | 1969 | 40 |
| -10 C (14 F): Days with min | 79 | 34 | 1958 | 7 |
| -20 C (-4 F): Days with min | 36 | 7 | 1936 | 1 |
| 20 C (68 F): Tropical nights (min | 80 | 84 | 2018 | 78 |
| 25 C (77 F): Days with min | 12 | 2 | 1949 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 82 | 65 | 1950 | 24 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 82 | 26 | 2019 | 9 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 79 | 9 | 2021 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 12 | 1 | 1941 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 28 | 5 | 1978 | 3 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 2 | 1 | 1960 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1935.
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).