Heat Index Counts for the Key West International Airport (EYW), 1948 – 2024
Values represent the total number of days when the maximum heat index reached or exceeded each threshold temperature. Individual years in the period of record without data are excluded.
| Year | 100ºF | 105ºF | 108ºF | 110ºF | 115ºF |
| 1948 | 53 | 4 | 1 | 0 | 0 |
| 1949 | 40 | 2 | 0 | 0 | 0 |
| 1950 | 6 | 0 | 0 | 0 | 0 |
| 1951 | 43 | 4 | 0 | 0 | 0 |
| 1952 | 20 | 0 | 0 | 0 | 0 |
| 1957 | 40 | 0 | 0 | 0 | 0 |
| 1958 | 37 | 1 | 0 | 0 | 0 |
| 1959 | 18 | 0 | 0 | 0 | 0 |
| 1960 | 50 | 0 | 0 | 0 | 0 |
| 1961 | 17 | 0 | 0 | 0 | 0 |
| 1962 | 52 | 0 | 0 | 0 | 0 |
| 1963 | 31 | 0 | 0 | 0 | 0 |
| 1964 | 20 | 0 | 0 | 0 | 0 |
| 1965 | 25 | 0 | 0 | 0 | 0 |
| 1966 | 8 | 0 | 0 | 0 | 0 |
| 1967 | 49 | 0 | 0 | 0 | 0 |
| 1968 | 29 | 0 | 0 | 0 | 0 |
| 1969 | 53 | 2 | 0 | 0 | 0 |
| 1970 | 6 | 0 | 0 | 0 | 0 |
| 1971 | 5 | 0 | 0 | 0 | 0 |
| 1972 | 9 | 0 | 0 | 0 | 0 |
| 1973 | 42 | 0 | 0 | 0 | 0 |
| 1974 | 42 | 0 | 0 | 0 | 0 |
| 1975 | 13 | 1 | 1 | 1 | 0 |
| 1976 | 44 | 3 | 0 | 0 | 0 |
| 1977 | 2 | 1 | 0 | 0 | 0 |
| 1978 | 60 | 2 | 1 | 0 | 0 |
| 1979 | 97 | 18 | 3 | 2 | 2 |
| 1980 | 45 | 6 | 2 | 0 | 0 |
| 1981 | 102 | 33 | 7 | 2 | 0 |
| 1982 | 44 | 0 | 0 | 0 | 0 |
| 1983 | 8 | 0 | 0 | 0 | 0 |
| 1984 | 0 | 0 | 0 | 0 | 0 |
| 1985 | 52 | 3 | 1 | 1 | 1 |
| 1986 | 49 | 0 | 0 | 0 | 0 |
| 1987 | 88 | 9 | 2 | 0 | 0 |
| 1988 | 65 | 2 | 0 | 0 | 0 |
| 1989 | 75 | 4 | 0 | 0 | 0 |
| 1990 | 76 | 6 | 0 | 0 | 0 |
| 1991 | 79 | 7 | 0 | 0 | 0 |
| 1992 | 61 | 5 | 1 | 0 | 0 |
| 1993 | 69 | 1 | 0 | 0 | 0 |
| 1994 | 55 | 3 | 1 | 0 | 0 |
| 1995 | 96 | 17 | 1 | 0 | 0 |
| 1996 | 60 | 7 | 0 | 0 | 0 |
| 1997 | 45 | 4 | 1 | 0 | 0 |
| 1998 | 90 | 13 | 1 | 0 | 0 |
| 1999 | 65 | 4 | 0 | 0 | 0 |
| 2000 | 76 | 13 | 5 | 2 | 0 |
| 2001 | 40 | 3 | 0 | 0 | 0 |
| 2002 | 94 | 22 | 3 | 1 | 0 |
| 2003 | 93 | 11 | 1 | 1 | 0 |
| 2004 | 76 | 7 | 0 | 0 | 0 |
| 2005 | 46 | 0 | 0 | 0 | 0 |
| 2006 | 19 | 0 | 0 | 0 | 0 |
| 2007 | 64 | 3 | 0 | 0 | 0 |
| 2008 | 33 | 0 | 0 | 0 | 0 |
| 2009 | 93 | 12 | 0 | 0 | 0 |
| 2010 | 80 | 16 | 1 | 0 | 0 |
| 2011 | 65 | 11 | 0 | 0 | 0 |
| 2012 | 13 | 0 | 0 | 0 | 0 |
| 2013 | 30 | 0 | 0 | 0 | 0 |
| 2014 | 64 | 8 | 1 | 1 | 1 |
| 2015 | 73 | 14 | 3 | 1 | 0 |
| 2016 | 101 | 17 | 3 | 2 | 0 |
| 2017 | 82 | 14 | 2 | 0 | 0 |
| 2018 | 95 | 12 | 1 | 0 | 0 |
| 2019 | 85 | 15 | 3 | 0 | 0 |
| 2020 | 110 | 24 | 3 | 1 | 0 |
| 2021 | 38 | 1 | 0 | 0 | 0 |
| 2022 | 84 | 8 | 1 | 0 | 0 |
| 2023 | 117 | 58 | 31 | 16 | 0 |
| 2024 | 119 | 64 | 21 | 13 | 2 |
| Average | 54 | 7 | 1 | 1 | 0 |
