First Temperature of 100°F or Higher Each year 1887-2024

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The following table lists the date of the first temperature of 100°F or higher for each year.

Note in some years Lincoln did not reach 100°F or higher and "none" is listed.
There were 25 years which had no temperatures reaching 100°F or higher:
(1889, 1891, 1893, 1896, 1902, 1903, 1904, 1905, 1906, 1908, 1915, 1920,
1923, 1949, 1958, 1959, 1965, 1968, 1972, 1986, 1992, 1993, 1994, 1996, 2019).

The earliest 100°F or higher temperature occurred on May 14 in 2013.
The latest first 100°F or higher occurred on September 5 in 1899.

There have only been 4 occurrences of a first 100°F or higher in May:
(May 14, 2013; May 24, 1967; May 26, 2018; May 29, 1934

The first 100°F or higher in 2023 occurred on June 28.

Calendar is day of the year (for example, June 28 is the 179th day of the year)

Year Month  Day  Calendar Year Month  Day  Calendar
1887 July 29 210 1955 July 26 207
1888 July 12 193 1956 June 21 172
1889 none none none 1957 July 7 188
1890 July 6 187 1958 none none none
1891 none none none 1959 none none none
1892 July 21 202 1960 June 4 155
1893 none none none 1961 June 29 180
1894 July 26 207 1962 August 19 231
1895 July 16 197 1963 June 7 158
1896 none none none 1964 July 2 183
1897 June 16 167 1965 none none none
1898 August 20 232 1966 July 5 186
1899 September 5 248 1967 May 24 146
1900 July 6 187 1968 none none none
1901 June 28 179 1969 June 6 157
1902 none none none 1970 June 28 179
1903 none none none 1971 June 24 175
1904 none none none 1972 none none none
1905 none none none 1973 June 24 175
1906 none none none 1974 June 19 170
1907 July 5 186 1975 August 12 224
1908 none none none 1976 July 9 190
1909 August 15 227 1977 July 3 184
1910 July 25 206 1978 July 4 185
1911 June 2 153 1979 June 14 165
1912 July 8 189 1980 June 26 177
1913 July 4 185 1981 July 11 192
1914 July 11 192 1982 August 3 215
1915 none none none 1983 July 18 199
1916 July 11 192 1984 July 8 189
1917 June 30 181 1985 August 31 243
1918 June 10 161 1986 none none none
1919 July 9 190 1987 June 12 163
1920 none none none 1988 June 18 169
1921 June 28 179 1989 June 20 171
1922 June 23 174 1990 June 28 179
1923 none none none 1991 July 5 186
1924 August 3 215 1992 none none none
1925 July 1 182 1993 none none none
1926 June 12 163 1994 none none none
1927 July 6 187 1995 July 10 191
1928 July 6 187 1996 none none none
1929 August 21 239 1997 July 25 206
1930 June 21 172 1998 July 20 201
1931 June 23 174 1999 July 28 209
1932 July 14 195 2000 August 12 224
1933 June 5 156 2001 July 6 187
1934 May 29 149 2002 July 19 200
1935 July 8 189 2003 July 14 195
1936 June 15 166 2004 August 3 215
1937 June 19 170 2005 July 17 198
1938 July 1 182 2006 June 30 181
1939 July 6 187 2007 July 7 188
1940 June 18 169 2008 August 3 215
1941 July 9 190 2009 August 8 220
1942 July 14 195 2010 August 12 224
1943 June 24 175 2011 June 6 157
1944 June 25 176 2012 June 27 178
1945 July 23 204 2013 May 14 134
1946 June 15 166 2014 July 21 202
1947 July 28 209 2015 July 24 205
1948 August 22 234 2016 June 15 166
1949 none none none 2017 July 21 202
1950 June 23 174 2018 May 26 146
1951 August 2 214 2019 none none none
1952 June 11 162 2020 none none none
1953 June 11 162 2021 June 16 167
1954 June 25 176 2022 June 13 164
2023 June 28 179
2024 June 24 175