Summerville 4W Threshold Days by Year (USC00388426)

18 fixed thresholds counted per year at Summerville 4W (USC00388426): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Summerville 4W Thresholds

Summerville 4W: days with a maximum temperature at or above 30 C (86 F) in 104 years, most in 1925 with 146.
Summerville 4W: days with a maximum temperature at or above 90 F (32.2 C) in 104 years, most in 1925 with 109.
Summerville 4W: days with a maximum temperature at or above 35 C (95 F) in 102 years, most in 1925 with 54.
Summerville 4W: nights with a minimum temperature at or below 0 C (32 F) in 98 years, most in 1968 with 75.
18 fixed thresholds have at least one qualifying day at Summerville 4W.

Days at or above 30 C (86 F)

104 years with a qualifying day

Days per year at Summerville 4W with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 146 in 1925.

Days at or above 30 C (86 F) per year at Summerville 4W
Year	Days	Decade average
1899	93	93
1900	82	89.7
1901	53	89.7
1902	88	89.7
1903	60	89.7
1904	76	89.7
1905	87	89.7
1906	108	89.7
1907	124	89.7
1908	120	89.7
1909	99	89.7
1910	103	102.1
1911	133	102.1
1912	104	102.1
1913	104	102.1
1914	101	102.1
1915	111	102.1
1916	96	102.1
1917	103	102.1
1918	92	102.1
1919	74	102.1
1920	100	114.1
1921	128	114.1
1922	126	114.1
1923	99	114.1
1924	95	114.1
1925	146	114.1
1928	115	114.1
1929	104	114.1
1930	123	118.9
1931	136	118.9
1932	109	118.9
1933	130	118.9
1934	120	118.9
1935	107	118.9
1936	124	118.9
1937	110	118.9
1938	116	118.9
1939	114	118.9
1940	91	106.4
1941	133	106.4
1942	130	106.4
1943	106	106.4
1944	121	106.4
1945	114	106.4
1946	83	106.4
1947	95	106.4
1948	98	106.4
1949	93	106.4
1950	101	107
1951	106	107
1952	112	107
1953	107	107
1954	130	107
1955	101	107
1956	109	107
1957	91	107
1958	102	107
1959	111	107
1960	130	106.7
1961	101	106.7
1962	117	106.7
1963	107	106.7
1964	100	106.7
1965	126	106.7
1966	94	106.7
1967	90	106.7
1968	117	106.7
1969	85	106.7
1970	116	103.1
1971	100	103.1
1972	92	103.1
1973	120	103.1
1974	96	103.1
1975	101	103.1
1976	76	103.1
1977	123	103.1
1978	120	103.1
1979	87	103.1
1980	115	109.1
1981	105	109.1
1982	94	109.1
1983	100	109.1
1984	100	109.1
1985	111	109.1
1986	125	109.1
1987	117	109.1
1988	103	109.1
1989	121	109.1
1990	145	111.3
1991	125	111.3
1992	87	111.3
1993	119	111.3
1994	89	111.3
1995	108	111.3
1996	115	111.3
1997	102	111.3
2007	113	113
2010	113	113
2022	122	114
2023	103	114
2024	113	114
2025	113	114
2026	119	114

For each year, a bar from the first to the last day at Summerville 4W meeting 30 C (86 F).

First to last qualifying date each year at Summerville 4W
Year	First date	Last date
1899	1899-04-14	1899-09-10
1900	1900-06-03	1900-10-17
1901	1901-05-01	1901-10-04
1902	1902-05-01	1902-11-14
1903	1903-05-20	1903-09-28
1904	1904-04-02	1904-09-30
1905	1905-04-29	1905-09-24
1906	1906-04-05	1906-10-06
1907	1907-03-14	1907-10-08
1908	1908-03-16	1908-10-19
1909	1909-04-05	1909-09-24
1910	1910-03-29	1910-10-21
1911	1911-03-13	1911-10-07
1912	1912-03-20	1912-09-26
1913	1913-05-02	1913-10-01
1914	1914-04-27	1914-09-24
1915	1915-04-20	1915-10-16
1916	1916-04-13	1916-09-28
1917	1917-04-18	1917-10-19
1918	1918-04-04	1918-09-20
1919	1919-04-24	1919-10-29
1920	1920-04-17	1920-10-23
1921	1921-03-15	1921-10-11
1922	1922-03-29	1922-12-02
1923	1923-03-05	1923-10-01
1924	1924-04-09	1924-10-03
1925	1925-03-09	1925-10-17
1928	1928-03-31	1928-10-24
1929	1929-03-25	1929-11-16
1930	1930-02-26	1930-10-18
1931	1931-05-01	1931-10-26
1932	1932-03-23	1932-10-25
1933	1933-04-20	1933-10-18
1934	1934-04-04	1934-10-01
1935	1935-03-21	1935-10-24
1936	1936-04-01	1936-10-27
1937	1937-04-20	1937-10-08
1938	1938-03-21	1938-10-20
1939	1939-04-27	1939-10-29
1940	1940-03-30	1940-10-29
1941	1941-04-16	1941-10-24
1942	1942-03-16	1942-10-25
1943	1943-04-10	1943-10-23
1944	1944-05-15	1944-10-10
1945	1945-03-16	1945-10-03
1946	1946-04-05	1946-10-20
1947	1947-04-07	1947-10-20
1948	1948-03-21	1948-09-23
1949	1949-04-25	1949-10-25
1950	1950-04-24	1950-09-23
1951	1951-04-28	1951-10-08
1952	1952-04-20	1952-10-03
1953	1953-04-25	1953-09-21
1954	1954-03-25	1954-10-14
1955	1955-03-13	1955-10-02
1956	1956-05-13	1956-10-06
1957	1957-04-28	1957-09-24
1958	1958-04-25	1958-10-11
1959	1959-04-21	1959-10-13
1960	1960-04-18	1960-10-20
1961	1961-04-24	1961-11-06
1962	1962-03-01	1962-10-22
1963	1963-03-19	1963-09-21
1964	1964-04-22	1964-10-05
1965	1965-04-09	1965-10-04
1966	1966-04-02	1966-10-09
1967	1967-03-13	1967-10-07
1968	1968-03-21	1968-10-08
1969	1969-04-04	1969-10-09
1970	1970-04-22	1970-10-13
1971	1971-04-14	1971-10-06
1972	1972-04-15	1972-11-04
1973	1973-03-16	1973-10-06
1974	1974-03-09	1974-09-30
1975	1975-03-14	1975-09-24
1976	1976-03-04	1976-09-29
1977	1977-03-17	1977-10-03
1978	1978-04-03	1978-10-28
1979	1979-04-03	1979-10-02
1980	1980-04-24	1980-09-27
1981	1981-04-14	1981-10-07
1982	1982-03-14	1982-09-21
1983	1983-05-13	1983-10-06
1984	1984-04-27	1984-09-27
1985	1985-03-30	1985-10-17
1986	1986-04-03	1986-10-14
1987	1987-04-14	1987-10-01
1988	1988-04-06	1988-10-03
1989	1989-02-17	1989-10-17
1990	1990-03-13	1990-10-18
1991	1991-03-24	1991-10-28
1992	1992-04-26	1992-09-27
1993	1993-04-12	1993-10-10
1994	1994-04-15	1994-09-16
1995	1995-03-23	1995-10-07
1996	1996-04-15	1996-09-29
1997	1997-03-23	1997-10-10
2007	2007-03-24	2007-10-24
2010	2010-05-08	2010-10-28
2022	2022-02-25	2022-09-27
2023	2023-04-06	2023-10-30
2024	2024-04-16	2024-10-27
2025	2025-04-05	2025-10-08
2026	2026-03-10	2026-08-31

Every Fixed Threshold

Fixed thresholds at Summerville 4W
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	104	146	1925	119
35 C (95 F): Days	102	54	1925	44
40 C (104 F): Days	7	2	1925	1
90 F (32.2 C): Days	104	109	1925	93
100 F (37.8 C): Days	47	12	1925	6
0 C (32 F): Ice days (max	27	3	1970	1
0 C (32 F): Frost days (min	98	75	1968	32
-10 C (14 F): Days with min	26	5	1970	1
-20 C (-4 F): Days with min	1	1	1899	1
20 C (68 F): Tropical nights (min	98	114	1939	95
25 C (77 F): Days with min	46	10	1952	12
10 mm (0.39 in): Days with 10 mm or more rain	97	57	1947	22
25 mm (0.98 in): Days with 25 mm or more rain	97	26	1948	14
50 mm (1.97 in): Days with 50 mm or more rain	94	9	1992	3
100 mm (3.94 in): Days with 100 mm or more rain	36	4	1973	1
200 mm (7.87 in): Days with 200 mm or more rain	3	1	1940	1
10 cm (3.9 in): Days with 10 cm or more snowfall	2	1	1973	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	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 1899.

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Data for Summerville 4W 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).

Summerville 4W Threshold Days by Year (USC00388426)

Key Facts for Summerville 4W Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

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