First Temperature of 100°F or Higher Each year 1887-2023

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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