Chattanooga AP Threshold Days by Year (USW00013882)

18 fixed thresholds counted per year at Chattanooga AP (USW00013882): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chattanooga AP Thresholds

Chattanooga AP: days with a maximum temperature at or above 30 C (86 F) in 88 years, most in 2010 with 136.
Chattanooga AP: days with a maximum temperature at or above 90 F (32.2 C) in 88 years, most in 2016 with 102.
Chattanooga AP: nights with a minimum temperature at or below 0 C (32 F) in 88 years, most in 1968 with 98.
Chattanooga AP: nights with a minimum temperature at or above 20 C (68 F) in 88 years, most in 2018 with 125.
18 fixed thresholds have at least one qualifying day at Chattanooga AP.

Days at or above 30 C (86 F)

88 years with a qualifying day

Days per year at Chattanooga AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 136 in 2010.

Days at or above 30 C (86 F) per year at Chattanooga AP
Year	Days	Decade average
1939	119	119
1940	96	98.5
1941	122	98.5
1942	91	98.5
1943	103	98.5
1944	106	98.5
1945	96	98.5
1946	79	98.5
1947	98	98.5
1948	97	98.5
1949	97	98.5
1950	69	102.6
1951	111	102.6
1952	109	102.6
1953	117	102.6
1954	121	102.6
1955	106	102.6
1956	108	102.6
1957	101	102.6
1958	87	102.6
1959	97	102.6
1960	103	83.3
1961	85	83.3
1962	112	83.3
1963	99	83.3
1964	91	83.3
1965	77	83.3
1966	61	83.3
1967	33	83.3
1968	91	83.3
1969	81	83.3
1970	96	77
1971	91	77
1972	48	77
1973	93	77
1974	47	77
1975	76	77
1976	58	77
1977	108	77
1978	96	77
1979	57	77
1980	92	87.9
1981	84	87.9
1982	92	87.9
1983	80	87.9
1984	72	87.9
1985	69	87.9
1986	110	87.9
1987	109	87.9
1988	92	87.9
1989	79	87.9
1990	99	88.5
1991	100	88.5
1992	45	88.5
1993	121	88.5
1994	76	88.5
1995	90	88.5
1996	74	88.5
1997	65	88.5
1998	120	88.5
1999	95	88.5
2000	100	94
2001	86	94
2002	117	94
2003	64	94
2004	70	94
2005	95	94
2006	99	94
2007	127	94
2008	97	94
2009	85	94
2010	136	111.2
2011	107	111.2
2012	102	111.2
2013	86	111.2
2014	100	111.2
2015	93	111.2
2016	136	111.2
2017	99	111.2
2018	120	111.2
2019	133	111.2
2020	101	105.7
2021	89	105.7
2022	104	105.7
2023	107	105.7
2024	112	105.7
2025	104	105.7
2026	123	105.7

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

First to last qualifying date each year at Chattanooga AP
Year	First date	Last date
1939	1939-04-26	1939-10-24
1940	1940-04-02	1940-10-27
1941	1941-04-19	1941-10-23
1942	1942-04-25	1942-09-19
1943	1943-04-27	1943-09-15
1944	1944-05-11	1944-10-06
1945	1945-05-26	1945-09-30
1946	1946-04-02	1946-09-26
1947	1947-05-15	1947-10-14
1948	1948-04-25	1948-09-22
1949	1949-05-03	1949-10-08
1950	1950-05-03	1950-09-20
1951	1951-04-27	1951-10-06
1952	1952-05-01	1952-10-01
1953	1953-05-01	1953-10-21
1954	1954-04-15	1954-10-14
1955	1955-04-16	1955-09-29
1956	1956-04-27	1956-09-30
1957	1957-04-24	1957-09-22
1958	1958-04-24	1958-09-26
1959	1959-05-02	1959-10-05
1960	1960-04-23	1960-09-22
1961	1961-05-07	1961-09-29
1962	1962-04-30	1962-10-12
1963	1963-03-31	1963-10-22
1964	1964-04-19	1964-09-23
1965	1965-04-23	1965-09-21
1966	1966-05-29	1966-09-06
1967	1967-04-05	1967-09-20
1968	1968-05-24	1968-10-13
1969	1969-04-04	1969-09-18
1970	1970-04-23	1970-09-26
1971	1971-04-19	1971-10-04
1972	1972-04-15	1972-09-19
1973	1973-05-10	1973-10-04
1974	1974-05-17	1974-09-13
1975	1975-05-22	1975-09-09
1976	1976-04-20	1976-09-08
1977	1977-04-16	1977-10-01
1978	1978-04-08	1978-09-23
1979	1979-05-10	1979-09-12
1980	1980-04-23	1980-09-23
1981	1981-04-14	1981-10-06
1982	1982-03-19	1982-10-10
1983	1983-06-03	1983-10-03
1984	1984-04-26	1984-09-25
1985	1985-04-21	1985-09-11
1986	1986-04-25	1986-10-04
1987	1987-04-20	1987-09-17
1988	1988-04-05	1988-09-24
1989	1989-03-28	1989-09-14
1990	1990-04-26	1990-09-21
1991	1991-05-15	1991-09-18
1992	1992-05-18	1992-09-10
1993	1993-05-06	1993-10-09
1994	1994-04-11	1994-09-17
1995	1995-04-09	1995-09-10
1996	1996-05-05	1996-09-06
1997	1997-05-18	1997-09-20
1998	1998-05-13	1998-09-30
1999	1999-04-03	1999-09-28
2000	2000-05-06	2000-10-05
2001	2001-04-08	2001-09-23
2002	2002-04-15	2002-10-06
2003	2003-05-09	2003-09-20
2004	2004-04-24	2004-09-24
2005	2005-05-12	2005-10-19
2006	2006-04-14	2006-10-05
2007	2007-03-25	2007-10-09
2008	2008-05-25	2008-09-29
2009	2009-04-24	2009-09-25
2010	2010-04-02	2010-10-11
2011	2011-04-09	2011-09-14
2012	2012-03-15	2012-09-28
2013	2013-05-15	2013-10-05
2014	2014-05-04	2014-10-02
2015	2015-05-07	2015-09-23
2016	2016-04-27	2016-11-01
2017	2017-04-13	2017-10-11
2018	2018-05-10	2018-10-08
2019	2019-04-29	2019-10-05
2020	2020-03-27	2020-09-17
2021	2021-04-28	2021-09-29
2022	2022-05-02	2022-09-22
2023	2023-04-05	2023-10-03
2024	2024-04-15	2024-10-06
2025	2025-04-04	2025-10-01
2026	2026-03-21	2026-10-14

Every Fixed Threshold

Fixed thresholds at Chattanooga AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	88	136	2010	123
35 C (95 F): Days	77	54	2016	31
40 C (104 F): Days	7	5	1952	3
90 F (32.2 C): Days	88	102	2016	87
100 F (37.8 C): Days	34	15	1952	7
0 C (32 F): Ice days (max	73	13	1978	2
0 C (32 F): Frost days (min	88	98	1968	34
-10 C (14 F): Days with min	64	17	1977	2
-20 C (-4 F): Days with min	4	3	1940	2
20 C (68 F): Tropical nights (min	88	125	2018	108
25 C (77 F): Days with min	24	13	2010	8
10 mm (0.39 in): Days with 10 mm or more rain	88	60	1989	32
25 mm (0.98 in): Days with 25 mm or more rain	88	24	1990	9
50 mm (1.97 in): Days with 50 mm or more rain	82	9	1973	4
100 mm (3.94 in): Days with 100 mm or more rain	15	2	1949	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	2011	1
10 cm (3.9 in): Days with 10 cm or more snowfall	14	2	1960	1
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1988	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1939.

Download the Data

Data for Chattanooga AP 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Chattanooga AP Threshold Days by Year (USW00013882)

Key Facts for Chattanooga AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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