Charleston Threshold Days by Year (USC00401636)

5 fixed thresholds counted per year at Charleston (USC00401636): 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 57 years, most in 1923 with 60.
Charleston: days with 25 mm (0.98 in) or more of precipitation in 57 years, most in 1909 with 28.
Charleston: days with 50 mm (1.97 in) or more of precipitation in 53 years, most in 1954 with 7.
Charleston: days with 10 cm (3.9 in) or more of snowfall in 7 years, most in 1936 with 2.
5 fixed thresholds have at least one qualifying day at Charleston.

Days with 10 mm (0.39 in) or more of precipitation

57 years with a qualifying day

Days per year at Charleston with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 60 in 1923.

Days with 10 mm (0.39 in) or more of precipitation per year at Charleston
Year	Days	Decade average
1890	53	46
1893	39	46
1904	35	47.5
1905	58	47.5
1906	47	47.5
1907	54	47.5
1908	34	47.5
1909	57	47.5
1910	41	46.4
1911	55	46.4
1912	49	46.4
1913	41	46.4
1914	43	46.4
1915	45	46.4
1916	37	46.4
1917	48	46.4
1918	49	46.4
1919	56	46.4
1920	47	46.1
1921	47	46.1
1922	38	46.1
1923	60	46.1
1924	40	46.1
1925	35	46.1
1926	47	46.1
1927	44	46.1
1928	50	46.1
1929	53	46.1
1930	30	41.8
1931	36	41.8
1932	51	41.8
1933	40	41.8
1934	48	41.8
1935	40	41.8
1936	46	41.8
1937	49	41.8
1938	36	41.8
1939	42	41.8
1940	40	42.4
1941	34	42.4
1942	46	42.4
1943	39	42.4
1944	42	42.4
1947	43	42.4
1949	53	42.4
1950	52	43.9
1951	41	43.9
1952	43	43.9
1953	44	43.9
1954	37	43.9
1955	49	43.9
1956	39	43.9
1957	50	43.9
1958	41	43.9
1959	43	43.9
1960	39	44.5
1961	50	44.5

For each year, a bar from the first to the last day at Charleston meeting 10 mm (0.39 in).

First to last qualifying date each year at Charleston
Year	First date	Last date
1890	1890-01-13	1890-12-26
1893	1893-01-01	1893-12-30
1904	1904-01-22	1904-12-28
1905	1905-01-06	1905-12-31
1906	1906-01-03	1906-12-31
1907	1907-01-20	1907-12-30
1908	1908-01-05	1908-12-31
1909	1909-01-05	1909-12-25
1910	1910-01-07	1910-12-30
1911	1911-01-01	1911-12-31
1912	1912-01-09	1912-12-30
1913	1913-01-07	1913-12-31
1914	1914-01-03	1914-12-29
1915	1915-01-06	1915-12-29
1916	1916-02-01	1916-12-28
1917	1917-01-04	1917-12-12
1918	1918-01-11	1918-12-24
1919	1919-01-01	1919-12-14
1920	1920-01-08	1920-12-27
1921	1921-01-09	1921-12-25
1922	1922-01-11	1922-12-31
1923	1923-01-01	1923-12-14
1924	1924-01-02	1924-12-31
1925	1925-01-01	1925-12-21
1926	1926-01-04	1926-12-29
1927	1927-01-31	1927-12-31
1928	1928-01-09	1928-12-18
1929	1929-01-01	1929-12-23
1930	1930-01-03	1930-12-26
1931	1931-01-05	1931-12-31
1932	1932-01-01	1932-12-31
1933	1933-01-09	1933-12-26
1934	1934-01-01	1934-12-04
1935	1935-01-01	1935-12-29
1936	1936-01-02	1936-12-31
1937	1937-01-02	1937-12-28
1938	1938-01-01	1938-12-27
1939	1939-01-05	1939-12-27
1940	1940-01-12	1940-12-29
1941	1941-01-02	1941-12-25
1942	1942-01-01	1942-12-30
1943	1943-01-26	1943-12-26
1944	1944-01-02	1944-12-30
1947	1947-01-01	1947-12-16
1949	1949-01-04	1949-12-23
1950	1950-01-06	1950-12-29
1951	1951-01-04	1951-12-26
1952	1952-01-10	1952-12-31
1953	1953-01-08	1953-12-21
1954	1954-01-11	1954-12-30
1955	1955-01-11	1955-12-18
1956	1956-01-19	1956-12-23
1957	1957-01-05	1957-12-20
1958	1958-01-14	1958-12-28
1959	1959-01-09	1959-12-19
1960	1960-01-03	1960-12-11
1961	1961-01-01	1961-12-28

Every Fixed Threshold

Fixed thresholds at Charleston
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	57	60	1923	50
25 mm (0.98 in): Days with 25 mm or more rain	57	28	1909	17
50 mm (1.97 in): Days with 50 mm or more rain	53	7	1954	4
100 mm (3.94 in): Days with 100 mm or more rain	5	2	1951	2
10 cm (3.9 in): Days with 10 cm or more snowfall	7	2	1936	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1890.

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 (USC00401636)

Key Facts for Charleston Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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