Knoxville Threshold Days by Year (USC00134502)

20 fixed thresholds counted per year at Knoxville (USC00134502): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Knoxville Thresholds

Knoxville: days with a maximum temperature at or above 30 C (86 F) in 109 years, most in 1934 with 95.
Knoxville: days with a maximum temperature at or above 90 F (32.2 C) in 109 years, most in 1934 with 82.
Knoxville: days with a maximum temperature at or below 0 C (32 F) in 109 years, most in 1978 with 77.
Knoxville: nights with a minimum temperature at or below 0 C (32 F) in 106 years, most in 2018 with 156.
20 fixed thresholds have at least one qualifying day at Knoxville.

Days at or above 30 C (86 F)

109 years with a qualifying day

Days per year at Knoxville with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 95 in 1934.

Days at or above 30 C (86 F) per year at Knoxville
Year	Days	Decade average
1895	63	58.8
1896	49	58.8
1897	70	58.8
1898	54	58.8
1899	58	58.8
1900	69	52.3
1901	82	52.3
1905	26	52.3
1906	44	52.3
1907	43	52.3
1908	50	52.3
1910	62	67.7
1911	87	67.7
1912	52	67.7
1917	51	67.7
1918	70	67.7
1919	84	67.7
1920	42	49
1921	77	49
1922	54	49
1923	48	49
1924	31	49
1925	65	49
1926	50	49
1927	48	49
1928	37	49
1929	38	49
1930	67	73.8
1931	65	73.8
1932	43	73.8
1933	77	73.8
1934	95	73.8
1935	51	73.8
1936	93	73.8
1937	77	73.8
1938	85	73.8
1939	85	73.8
1940	62	62.3
1942	56	62.3
1943	61	62.3
1944	65	62.3
1945	38	62.3
1946	50	62.3
1947	86	62.3
1948	78	62.3
1949	65	62.3
1950	35	55.5
1951	28	55.5
1952	63	55.5
1953	68	55.5
1954	66	55.5
1955	75	55.5
1956	77	55.5
1957	50	55.5
1958	38	55.5
1959	55	55.5
1960	39	48.7
1961	44	48.7
1962	55	48.7
1963	58	48.7
1964	58	48.7
1965	44	48.7
1966	49	48.7
1967	34	48.7
1968	58	48.7
1969	48	48.7
1970	63	56.1
1971	68	56.1
1972	51	56.1
1973	50	56.1
1974	39	56.1
1975	61	56.1
1976	50	56.1
1977	63	56.1
1978	63	56.1
1979	53	56.1
1980	85	58
1981	46	58
1982	38	58
1983	79	58
1985	51	58
1986	55	58
1987	59	58
1988	66	58
1989	43	58
1990	43	38.6
1991	58	38.6
1992	17	38.6
1993	25	38.6
1994	40	38.6
1995	46	38.6
1996	29	38.6
1997	45	38.6
1998	46	38.6
1999	37	38.6
2000	40	39.5
2001	48	39.5
2002	52	39.5
2008	18	39.5
2012	65	42.3
2013	47	42.3
2014	16	42.3
2015	26	42.3
2016	45	42.3
2017	47	42.3
2018	51	42.3
2019	41	42.3
2021	46	51
2022	56	51

For each year, a bar from the first to the last day at Knoxville meeting 30 C (86 F).

First to last qualifying date each year at Knoxville
Year	First date	Last date
1895	1895-03-29	1895-09-22
1896	1896-04-15	1896-08-21
1897	1897-06-12	1897-10-15
1898	1898-04-16	1898-09-29
1899	1899-06-02	1899-10-22
1900	1900-05-11	1900-10-05
1901	1901-04-29	1901-09-26
1905	1905-06-03	1905-10-03
1906	1906-04-24	1906-09-16
1907	1907-03-21	1907-09-18
1908	1908-05-16	1908-09-22
1910	1910-04-28	1910-09-20
1911	1911-05-09	1911-09-23
1912	1912-05-22	1912-10-05
1917	1917-05-17	1917-09-16
1918	1918-05-04	1918-10-15
1919	1919-05-28	1919-10-03
1920	1920-05-22	1920-10-11
1921	1921-05-20	1921-09-22
1922	1922-05-10	1922-10-05
1923	1923-06-05	1923-09-26
1924	1924-05-05	1924-08-30
1925	1925-04-22	1925-09-29
1926	1926-04-30	1926-09-21
1927	1927-05-23	1927-10-27
1928	1928-05-03	1928-10-10
1929	1929-04-04	1929-09-27
1930	1930-04-10	1930-10-10
1931	1931-04-08	1931-09-20
1932	1932-05-13	1932-08-30
1933	1933-06-02	1933-09-25
1934	1934-05-06	1934-09-11
1935	1935-06-12	1935-09-24
1936	1936-04-30	1936-09-23
1937	1937-05-29	1937-10-29
1938	1938-03-21	1938-10-17
1939	1939-03-23	1939-10-07
1940	1940-05-13	1940-10-26
1942	1942-04-29	1942-10-02
1943	1943-05-28	1943-09-05
1944	1944-05-14	1944-09-18
1945	1945-06-23	1945-09-23
1946	1946-06-06	1946-09-17
1947	1947-05-14	1947-10-22
1948	1948-04-18	1948-09-21
1949	1949-04-25	1949-10-09
1950	1950-04-22	1950-10-31
1951	1951-06-19	1951-10-02
1952	1952-04-29	1952-09-30
1953	1953-05-25	1953-10-15
1954	1954-06-10	1954-10-03
1955	1955-04-18	1955-09-19
1956	1956-05-09	1956-10-12
1957	1957-05-28	1957-09-01
1958	1958-05-11	1958-10-04
1959	1959-06-08	1959-09-20
1960	1960-06-10	1960-09-07
1961	1961-06-07	1961-09-10
1962	1962-05-12	1962-10-10
1963	1963-05-08	1963-10-13
1964	1964-04-16	1964-09-09
1965	1965-04-30	1965-09-09
1966	1966-05-05	1966-08-31
1967	1967-04-16	1967-10-02
1968	1968-05-02	1968-10-14
1969	1969-05-27	1969-09-07
1970	1970-04-28	1970-09-21
1971	1971-06-03	1971-10-01
1972	1972-05-20	1972-09-20
1973	1973-06-07	1973-09-01
1974	1974-05-20	1974-08-26
1975	1975-05-18	1975-10-13
1976	1976-05-20	1976-10-02
1977	1977-05-18	1977-09-08
1978	1978-05-25	1978-09-18
1979	1979-05-29	1979-09-12
1980	1980-04-20	1980-09-21
1981	1981-04-02	1981-09-30
1982	1982-05-04	1982-09-12
1983	1983-06-09	1983-10-02
1985	1985-04-20	1985-09-19
1986	1986-03-29	1986-09-28
1987	1987-04-20	1987-09-05
1988	1988-05-14	1988-09-22
1989	1989-04-24	1989-08-31
1990	1990-06-10	1990-10-05
1991	1991-03-26	1991-09-29
1992	1992-04-30	1992-08-25
1993	1993-06-12	1993-09-12
1994	1994-04-18	1994-09-30
1995	1995-06-07	1995-09-13
1996	1996-05-17	1996-08-21
1997	1997-05-18	1997-10-06
1998	1998-05-16	1998-09-26
1999	1999-06-05	1999-10-15
2000	2000-04-04	2000-09-18
2001	2001-05-16	2001-09-04
2002	2002-04-16	2002-09-10
2008	2008-06-26	2008-09-03
2012	2012-05-20	2012-09-13
2013	2013-05-01	2013-09-20
2014	2014-05-08	2014-09-05
2015	2015-06-11	2015-09-18
2016	2016-05-31	2016-10-18
2017	2017-05-18	2017-09-26
2018	2018-05-24	2018-10-04
2019	2019-05-17	2019-10-02
2021	2021-06-04	2021-09-30
2022	2022-05-10	2022-09-21

Every Fixed Threshold

Fixed thresholds at Knoxville
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	109	95	1934	56
35 C (95 F): Days	99	55	1934	8
40 C (104 F): Days	18	25	1934	3
45 C (113 F): Days	2	2	1934	2
90 F (32.2 C): Days	109	82	1934	26
100 F (37.8 C): Days	38	36	1934	3
110 F (43.3 C): Days	3	6	1934	1
0 C (32 F): Ice days (max	109	77	1978	52
0 C (32 F): Frost days (min	106	156	2018	150
-10 C (14 F): Days with min	106	68	1978	66
-20 C (-4 F): Days with min	104	30	1936	16
-30 C (-22 F): Days with min	17	3	1996	1
20 C (68 F): Tropical nights (min	106	50	1983	29
25 C (77 F): Days with min	47	8	1930	1
10 mm (0.39 in): Days with 10 mm or more rain	106	44	1973	26
25 mm (0.98 in): Days with 25 mm or more rain	106	18	1973	6
50 mm (1.97 in): Days with 50 mm or more rain	79	5	1900	1
100 mm (3.94 in): Days with 100 mm or more rain	10	1	1952	1
10 cm (3.9 in): Days with 10 cm or more snowfall	68	5	1948	3
25 cm (9.8 in): Days with 25 cm or more snowfall	11	1	1921	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1895.

Download the Data

Data for Knoxville threshold days by year: CSV or JSON. Field meanings are on the data page.

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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Knoxville Threshold Days by Year (USC00134502)

Key Facts for Knoxville Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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