Charleston 1 Threshold Days by Year (USC00461575)

17 fixed thresholds counted per year at Charleston 1 (USC00461575): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Charleston 1 Thresholds

Charleston 1: days with 10 mm (0.39 in) or more of precipitation in 66 years, most in 1919 with 54.
Charleston 1: days with 25 mm (0.98 in) or more of precipitation in 66 years, most in 1913 with 18.
Charleston 1: days with a maximum temperature at or above 30 C (86 F) in 62 years, most in 1930 with 126.
Charleston 1: days with a maximum temperature at or above 90 F (32.2 C) in 62 years, most in 1930 with 96.
17 fixed thresholds have at least one qualifying day at Charleston 1.

Days at or above 30 C (86 F)

62 years with a qualifying day

Days per year at Charleston 1 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 126 in 1930.

Days at or above 30 C (86 F) per year at Charleston 1
Year	Days	Decade average
1904	55	61.5
1905	57	61.5
1906	74	61.5
1907	50	61.5
1908	76	61.5
1909	57	61.5
1910	51	84.9
1911	96	84.9
1912	55	84.9
1913	83	84.9
1914	86	84.9
1915	87	84.9
1916	106	84.9
1917	84	84.9
1918	90	84.9
1919	111	84.9
1921	111	85.6
1922	93	85.6
1923	68	85.6
1925	89	85.6
1926	85	85.6
1927	70	85.6
1928	73	85.6
1929	96	85.6
1930	126	95.1
1931	115	95.1
1932	92	95.1
1935	73	95.1
1936	113	95.1
1937	74	95.1
1938	65	95.1
1939	103	95.1
1940	67	77.8
1945	83	77.8
1946	74	77.8
1947	91	77.8
1948	69	77.8
1949	83	77.8
1950	33	74.7
1951	68	74.7
1952	81	74.7
1953	96	74.7
1954	85	74.7
1955	90	74.7
1956	63	74.7
1957	83	74.7
1958	53	74.7
1959	95	74.7
1960	63	67
1961	63	67
1962	75	67
1963	64	67
1964	81	67
1965	72	67
1966	64	67
1967	49	67
1968	65	67
1969	74	67
1970	88	61
1971	45	61
1972	44	61
1973	67	61

For each year, a bar from the first to the last day at Charleston 1 meeting 30 C (86 F).

First to last qualifying date each year at Charleston 1
Year	First date	Last date
1904	1904-05-06	1904-09-30
1905	1905-04-10	1905-09-28
1906	1906-04-13	1906-09-20
1907	1907-03-22	1907-09-21
1908	1908-04-24	1908-09-27
1909	1909-04-18	1909-09-16
1910	1910-04-30	1910-10-05
1911	1911-05-10	1911-09-10
1912	1912-05-20	1912-09-15
1913	1913-03-13	1913-09-07
1914	1914-04-28	1914-10-10
1915	1915-04-09	1915-10-04
1916	1916-05-08	1916-10-09
1917	1917-04-21	1917-09-23
1918	1918-05-03	1918-10-06
1919	1919-04-09	1919-10-27
1921	1921-03-20	1921-09-27
1922	1922-04-16	1922-10-06
1923	1923-05-03	1923-09-30
1925	1925-04-14	1925-09-20
1926	1926-05-02	1926-10-05
1927	1927-04-19	1927-10-31
1928	1928-05-05	1928-10-19
1929	1929-03-25	1929-09-30
1930	1930-04-12	1930-10-17
1931	1931-04-14	1931-11-24
1932	1932-04-08	1932-10-04
1935	1935-04-26	1935-09-25
1936	1936-04-28	1936-09-27
1937	1937-04-18	1937-10-06
1938	1938-04-27	1938-09-28
1939	1939-04-25	1939-10-11
1940	1940-05-06	1940-09-22
1945	1945-03-20	1945-10-30
1946	1946-04-03	1946-10-08
1947	1947-04-06	1947-10-17
1948	1948-04-25	1948-11-06
1949	1949-05-04	1949-10-12
1950	1950-03-28	1950-09-11
1951	1951-04-29	1951-10-06
1952	1952-04-22	1952-10-02
1953	1953-04-30	1953-10-20
1954	1954-03-26	1954-10-15
1955	1955-04-19	1955-10-08
1956	1956-04-28	1956-09-24
1957	1957-04-21	1957-09-16
1958	1958-04-20	1958-09-27
1959	1959-04-02	1959-10-07
1960	1960-04-14	1960-09-24
1961	1961-04-25	1961-11-04
1962	1962-04-27	1962-10-17
1963	1963-04-02	1963-10-24
1964	1964-04-18	1964-09-23
1965	1965-05-02	1965-09-23
1966	1966-05-09	1966-09-04
1967	1967-04-03	1967-10-06
1968	1968-05-04	1968-09-29
1969	1969-04-18	1969-10-14
1970	1970-04-30	1970-09-27
1971	1971-05-19	1971-09-30
1972	1972-05-26	1972-09-27
1973	1973-03-15	1973-10-05

Every Fixed Threshold

Fixed thresholds at Charleston 1
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	62	126	1930	67
35 C (95 F): Days	49	50	1931	4
40 C (104 F): Days	5	5	1930	2
90 F (32.2 C): Days	62	96	1930	34
100 F (37.8 C): Days	17	22	1931	1
0 C (32 F): Ice days (max	57	33	1958	16
0 C (32 F): Frost days (min	62	126	1917	93
-10 C (14 F): Days with min	62	40	1963	14
-20 C (-4 F): Days with min	13	7	1963	1
20 C (68 F): Tropical nights (min	62	51	1913	30
25 C (77 F): Days with min	9	1	1904	1
10 mm (0.39 in): Days with 10 mm or more rain	66	54	1919	40
25 mm (0.98 in): Days with 25 mm or more rain	66	18	1913	10
50 mm (1.97 in): Days with 50 mm or more rain	38	3	1919	2
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1961	1
10 cm (3.9 in): Days with 10 cm or more snowfall	33	7	1914	2
25 cm (9.8 in): Days with 25 cm or more snowfall	4	1	1916	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1904.

Download the Data

Data for Charleston 1 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 1 Threshold Days by Year (USC00461575)

Key Facts for Charleston 1 Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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