Charleston Threshold Days by Year (USC00231540)

16 fixed thresholds counted per year at Charleston (USC00231540): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Charleston Thresholds

Charleston: days with 10 mm (0.39 in) or more of precipitation in 39 years, most in 1973 with 59.
Charleston: days with 25 mm (0.98 in) or more of precipitation in 39 years, most in 1968 with 23.
Charleston: days with 50 mm (1.97 in) or more of precipitation in 36 years, most in 1957 with 7.
Charleston: days with a maximum temperature at or above 30 C (86 F) in 34 years, most in 1953 with 119.
16 fixed thresholds have at least one qualifying day at Charleston.

Days at or above 30 C (86 F)

34 years with a qualifying day

Days per year at Charleston with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 119 in 1953.

Days at or above 30 C (86 F) per year at Charleston
Year	Days	Decade average
1952	116	109.5
1953	119	109.5
1954	115	109.5
1955	112	109.5
1956	110	109.5
1957	82	109.5
1958	106	109.5
1959	116	109.5
1960	100	93.5
1961	90	93.5
1962	104	93.5
1963	107	93.5
1964	102	93.5
1965	114	93.5
1966	81	93.5
1967	56	93.5
1968	79	93.5
1969	102	93.5
1970	99	78.2
1971	93	78.2
1972	78	78.2
1973	78	78.2
1975	79	78.2
1976	58	78.2
1977	83	78.2
1978	62	78.2
1979	74	78.2
1983	84	76
1989	68	76
1997	74	85.7
1998	106	85.7
1999	77	85.7
2000	86	80
2001	74	80

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

First to last qualifying date each year at Charleston
Year	First date	Last date
1952	1952-04-27	1952-10-01
1953	1953-05-22	1953-10-22
1954	1954-04-14	1954-10-12
1955	1955-04-05	1955-10-06
1956	1956-05-05	1956-10-14
1957	1957-05-12	1957-09-15
1958	1958-05-12	1958-09-26
1959	1959-04-07	1959-10-10
1960	1960-04-23	1960-10-02
1961	1961-05-29	1961-10-12
1962	1962-05-07	1962-10-12
1963	1963-04-21	1963-10-22
1964	1964-05-16	1964-09-20
1965	1965-04-22	1965-09-21
1966	1966-05-06	1966-10-09
1967	1967-05-11	1967-10-06
1968	1968-05-02	1968-09-24
1969	1969-05-05	1969-10-05
1970	1970-05-12	1970-10-03
1971	1971-04-19	1971-10-03
1972	1972-05-20	1972-09-21
1973	1973-06-05	1973-09-25
1975	1975-05-19	1975-10-14
1976	1976-06-09	1976-10-05
1977	1977-04-16	1977-10-02
1978	1978-05-25	1978-09-21
1979	1979-05-11	1979-10-22
1983	1983-06-12	1983-10-01
1989	1989-04-23	1989-09-10
1997	1997-05-18	1997-10-08
1998	1998-05-14	1998-10-06
1999	1999-06-08	1999-10-02
2000	2000-05-18	2000-10-25
2001	2001-04-12	2001-09-24

Every Fixed Threshold

Fixed thresholds at Charleston
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	34	119	1953	74
35 C (95 F): Days	34	58	1954	6
40 C (104 F): Days	3	4	1952	2
90 F (32.2 C): Days	34	99	1954	43
100 F (37.8 C): Days	20	24	1954	2
0 C (32 F): Ice days (max	34	37	1978	10
0 C (32 F): Frost days (min	33	120	1979	80
-10 C (14 F): Days with min	33	38	1978	4
-20 C (-4 F): Days with min	7	3	1962	2
20 C (68 F): Tropical nights (min	33	79	1954	54
25 C (77 F): Days with min	20	9	1954	1
10 mm (0.39 in): Days with 10 mm or more rain	39	59	1973	44
25 mm (0.98 in): Days with 25 mm or more rain	39	23	1968	12
50 mm (1.97 in): Days with 50 mm or more rain	36	7	1957	3
100 mm (3.94 in): Days with 100 mm or more rain	11	1	1952	1
10 cm (3.9 in): Days with 10 cm or more snowfall	15	4	1960	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1952.

Download the Data

Data for Charleston 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).

Charleston Threshold Days by Year (USC00231540)

Key Facts for Charleston Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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