Charleston Intl AP Threshold Days by Year (USW00013880)

16 fixed thresholds counted per year at Charleston Intl AP (USW00013880): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Charleston Intl AP Thresholds

Charleston Intl AP: days with a maximum temperature at or above 30 C (86 F) in 89 years, most in 2018 with 146.
Charleston Intl AP: days with a maximum temperature at or above 90 F (32.2 C) in 89 years, most in 2016 with 98.
Charleston Intl AP: nights with a minimum temperature at or below 0 C (32 F) in 89 years, most in 1968 with 68.
Charleston Intl AP: nights with a minimum temperature at or above 20 C (68 F) in 89 years, most in 2018 with 152.
16 fixed thresholds have at least one qualifying day at Charleston Intl AP.

Days at or above 30 C (86 F)

89 years with a qualifying day

Days per year at Charleston Intl AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 146 in 2018.

Days at or above 30 C (86 F) per year at Charleston Intl AP
Year	Days	Decade average
1938	106	112.5
1939	119	112.5
1940	93	106.6
1941	126	106.6
1942	127	106.6
1943	105	106.6
1944	112	106.6
1945	104	106.6
1946	95	106.6
1947	108	106.6
1948	96	106.6
1949	100	106.6
1950	93	96.8
1951	102	96.8
1952	112	96.8
1953	96	96.8
1954	120	96.8
1955	96	96.8
1956	99	96.8
1957	94	96.8
1958	84	96.8
1959	72	96.8
1960	110	99.2
1961	96	99.2
1962	108	99.2
1963	109	99.2
1964	103	99.2
1965	105	99.2
1966	79	99.2
1967	88	99.2
1968	111	99.2
1969	83	99.2
1970	120	106.2
1971	121	106.2
1972	99	106.2
1973	125	106.2
1974	79	106.2
1975	106	106.2
1976	83	106.2
1977	122	106.2
1978	115	106.2
1979	92	106.2
1980	117	107.4
1981	114	107.4
1982	85	107.4
1983	96	107.4
1984	91	107.4
1985	107	107.4
1986	129	107.4
1987	118	107.4
1988	101	107.4
1989	116	107.4
1990	141	109.2
1991	106	109.2
1992	98	109.2
1993	119	109.2
1994	104	109.2
1995	111	109.2
1996	103	109.2
1997	92	109.2
1998	120	109.2
1999	98	109.2
2000	104	111.1
2001	108	111.1
2002	125	111.1
2003	102	111.1
2004	107	111.1
2005	112	111.1
2006	113	111.1
2007	113	111.1
2008	112	111.1
2009	115	111.1
2010	133	127.9
2011	131	127.9
2012	112	127.9
2013	114	127.9
2014	140	127.9
2015	115	127.9
2016	138	127.9
2017	121	127.9
2018	146	127.9
2019	129	127.9
2020	110	118.4
2021	111	118.4
2022	120	118.4
2023	114	118.4
2024	122	118.4
2025	110	118.4
2026	142	118.4

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

First to last qualifying date each year at Charleston Intl AP
Year	First date	Last date
1938	1938-03-26	1938-10-19
1939	1939-04-26	1939-10-28
1940	1940-04-02	1940-09-22
1941	1941-04-15	1941-10-23
1942	1942-03-16	1942-10-24
1943	1943-04-28	1943-10-21
1944	1944-05-15	1944-10-08
1945	1945-03-16	1945-10-02
1946	1946-04-03	1946-11-11
1947	1947-04-06	1947-10-19
1948	1948-03-20	1948-09-29
1949	1949-04-08	1949-10-06
1950	1950-04-23	1950-10-20
1951	1951-04-30	1951-10-07
1952	1952-05-01	1952-10-02
1953	1953-04-24	1953-09-18
1954	1954-03-30	1954-10-13
1955	1955-03-12	1955-09-29
1956	1956-05-13	1956-10-05
1957	1957-05-16	1957-09-23
1958	1958-04-24	1958-10-10
1959	1959-04-20	1959-10-14
1960	1960-04-24	1960-10-19
1961	1961-03-07	1961-11-02
1962	1962-02-28	1962-10-09
1963	1963-03-18	1963-10-28
1964	1964-04-21	1964-10-01
1965	1965-04-09	1965-10-02
1966	1966-05-21	1966-10-23
1967	1967-03-12	1967-10-06
1968	1968-03-20	1968-10-07
1969	1969-05-13	1969-10-02
1970	1970-04-21	1970-10-03
1971	1971-04-13	1971-11-02
1972	1972-04-13	1972-11-04
1973	1973-03-12	1973-11-27
1974	1974-03-08	1974-09-29
1975	1975-04-28	1975-10-12
1976	1976-03-03	1976-10-08
1977	1977-04-08	1977-10-02
1978	1978-04-02	1978-11-18
1979	1979-05-12	1979-10-01
1980	1980-04-23	1980-10-19
1981	1981-04-13	1981-10-06
1982	1982-03-20	1982-09-20
1983	1983-05-13	1983-10-05
1984	1984-04-26	1984-09-26
1985	1985-03-29	1985-10-15
1986	1986-04-02	1986-10-14
1987	1987-04-13	1987-09-29
1988	1988-04-05	1988-10-02
1989	1989-02-16	1989-10-17
1990	1990-03-12	1990-10-15
1991	1991-04-16	1991-09-25
1992	1992-04-24	1992-09-27
1993	1993-04-12	1993-10-21
1994	1994-04-15	1994-09-29
1995	1995-03-22	1995-10-14
1996	1996-04-14	1996-09-28
1997	1997-03-22	1997-10-08
1998	1998-05-08	1998-10-01
1999	1999-04-02	1999-09-26
2000	2000-05-07	2000-10-06
2001	2001-04-09	2001-10-25
2002	2002-03-16	2002-10-07
2003	2003-04-05	2003-11-06
2004	2004-04-24	2004-10-02
2005	2005-05-08	2005-10-21
2006	2006-04-02	2006-10-20
2007	2007-03-25	2007-10-23
2008	2008-04-12	2008-10-01
2009	2009-03-09	2009-10-10
2010	2010-04-01	2010-10-27
2011	2011-03-18	2011-09-30
2012	2012-03-17	2012-10-07
2013	2013-05-09	2013-10-06
2014	2014-04-02	2014-10-26
2015	2015-03-17	2015-09-30
2016	2016-03-15	2016-10-31
2017	2017-03-21	2017-10-16
2018	2018-02-25	2018-10-20
2019	2019-04-24	2019-10-31
2020	2020-03-21	2020-10-16
2021	2021-03-26	2021-10-16
2022	2022-02-23	2022-09-26
2023	2023-02-24	2023-10-05
2024	2024-03-15	2024-10-26
2025	2025-04-04	2025-10-08
2026	2026-03-10	2026-10-14

Every Fixed Threshold

Fixed thresholds at Charleston Intl AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	89	146	2018	142
35 C (95 F): Days	88	36	2011	42
40 C (104 F): Days	2	2	1986	1
90 F (32.2 C): Days	89	98	2016	89
100 F (37.8 C): Days	28	11	1986	1
0 C (32 F): Ice days (max	18	3	1970	1
0 C (32 F): Frost days (min	89	68	1968	25
-10 C (14 F): Days with min	14	3	1940	1
20 C (68 F): Tropical nights (min	89	152	2018	124
25 C (77 F): Days with min	74	28	2016	24
10 mm (0.39 in): Days with 10 mm or more rain	89	58	1975	22
25 mm (0.98 in): Days with 25 mm or more rain	89	25	1964	9
50 mm (1.97 in): Days with 50 mm or more rain	87	10	1994	1
100 mm (3.94 in): Days with 100 mm or more rain	42	3	1973	1
200 mm (7.87 in): Days with 200 mm or more rain	4	1	1940	1
10 cm (3.9 in): Days with 10 cm or more snowfall	3	1	1973	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1938.

Download the Data

Data for Charleston Intl 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).

Charleston Intl AP Threshold Days by Year (USW00013880)

Key Facts for Charleston Intl AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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