Portsmouth-Sciotoville Threshold Days by Year (USC00336781)

18 fixed thresholds counted per year at Portsmouth-Sciotoville (USC00336781): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Portsmouth-Sciotoville Thresholds

Portsmouth-Sciotoville: days with a maximum temperature at or above 30 C (86 F) in 130 years, most in 1939 with 110.
Portsmouth-Sciotoville: days with a maximum temperature at or below 0 C (32 F) in 130 years, most in 1977 with 40.
Portsmouth-Sciotoville: nights with a minimum temperature at or below 0 C (32 F) in 130 years, most in 1917 with 131.
Portsmouth-Sciotoville: nights with a minimum temperature at or above 20 C (68 F) in 130 years, most in 1949 with 60.
18 fixed thresholds have at least one qualifying day at Portsmouth-Sciotoville.

Days at or above 30 C (86 F)

130 years with a qualifying day

Days per year at Portsmouth-Sciotoville with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 110 in 1939.

Days at or above 30 C (86 F) per year at Portsmouth-Sciotoville
Year	Days	Decade average
1893	90	94
1894	101	94
1895	101	94
1896	102	94
1897	87	94
1898	85	94
1899	92	94
1900	102	61.8
1901	67	61.8
1902	74	61.8
1903	72	61.8
1904	50	61.8
1905	45	61.8
1906	63	61.8
1907	43	61.8
1908	63	61.8
1909	39	61.8
1910	44	75.5
1911	85	75.5
1912	53	75.5
1913	91	75.5
1914	99	75.5
1915	57	75.5
1916	91	75.5
1917	77	75.5
1918	74	75.5
1919	84	75.5
1920	68	79.6
1921	107	79.6
1922	92	79.6
1924	63	79.6
1925	89	79.6
1926	77	79.6
1927	67	79.6
1928	77	79.6
1929	76	79.6
1930	99	93.2
1931	91	93.2
1932	94	93.2
1933	88	93.2
1934	101	93.2
1935	72	93.2
1936	108	93.2
1937	84	93.2
1938	85	93.2
1939	110	93.2
1940	84	86.1
1941	108	86.1
1942	92	86.1
1943	89	86.1
1944	104	86.1
1945	80	86.1
1946	59	86.1
1947	73	86.1
1948	85	86.1
1949	87	86.1
1950	46	67.7
1951	67	67.7
1952	78	67.7
1953	77	67.7
1954	88	67.7
1955	72	67.7
1956	60	67.7
1957	74	67.7
1958	46	67.7
1959	69	67.7
1960	51	56.4
1961	51	56.4
1962	70	56.4
1963	44	56.4
1964	69	56.4
1965	64	56.4
1966	64	56.4
1967	35	56.4
1968	51	56.4
1969	65	56.4
1970	75	55.7
1971	45	55.7
1972	41	55.7
1973	72	55.7
1974	47	55.7
1975	63	55.7
1976	48	55.7
1977	72	55.7
1978	59	55.7
1979	35	55.7
1980	64	70.6
1982	54	70.6
1983	84	70.6
1984	67	70.6
1985	54	70.6
1986	80	70.6
1987	101	70.6
1988	78	70.6
1989	53	70.6
1990	31	46.4
1991	48	46.4
1992	11	46.4
1993	43	46.4
1994	24	46.4
1995	65	46.4
1996	47	46.4
1997	42	46.4
1998	78	46.4
1999	75	46.4
2000	42	59.9
2001	55	59.9
2002	82	59.9
2003	39	59.9
2004	48	59.9
2005	75	59.9
2007	98	59.9
2008	60	59.9
2009	40	59.9
2010	92	70.3
2011	70	70.3
2012	81	70.3
2013	41	70.3
2014	49	70.3
2016	81	70.3
2017	56	70.3
2018	82	70.3
2019	81	70.3
2020	69	68.9
2021	63	68.9
2022	66	68.9
2023	51	68.9
2024	85	68.9
2025	78	68.9
2026	70	68.9

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

First to last qualifying date each year at Portsmouth-Sciotoville
Year	First date	Last date
1893	1893-03-23	1893-10-11
1894	1894-03-20	1894-09-15
1895	1895-04-25	1895-09-25
1896	1896-04-11	1896-09-18
1897	1897-04-24	1897-10-16
1898	1898-05-01	1898-10-02
1899	1899-04-20	1899-10-14
1900	1900-04-24	1900-10-05
1901	1901-04-29	1901-09-16
1902	1902-04-21	1902-09-25
1903	1903-04-29	1903-10-04
1904	1904-05-24	1904-10-10
1905	1905-05-04	1905-09-28
1906	1906-04-13	1906-09-20
1907	1907-03-22	1907-09-21
1908	1908-05-14	1908-09-25
1909	1909-05-31	1909-09-14
1910	1910-03-28	1910-10-03
1911	1911-05-10	1911-09-27
1912	1912-05-03	1912-09-14
1913	1913-04-23	1913-10-10
1914	1914-04-18	1914-10-07
1915	1915-04-19	1915-09-25
1916	1916-03-25	1916-10-08
1917	1917-04-17	1917-10-18
1918	1918-05-05	1918-10-05
1919	1919-04-09	1919-10-03
1920	1920-04-22	1920-10-23
1921	1921-03-26	1921-09-23
1922	1922-04-07	1922-10-06
1924	1924-05-06	1924-10-19
1925	1925-04-23	1925-09-20
1926	1926-05-01	1926-10-04
1927	1927-04-19	1927-10-30
1928	1928-05-03	1928-10-17
1929	1929-03-24	1929-09-28
1930	1930-04-11	1930-10-15
1931	1931-04-19	1931-10-04
1932	1932-05-04	1932-09-14
1933	1933-04-30	1933-10-21
1934	1934-04-03	1934-10-11
1935	1935-04-26	1935-10-14
1936	1936-05-01	1936-09-27
1937	1937-04-23	1937-10-06
1938	1938-04-19	1938-10-18
1939	1939-04-24	1939-10-10
1940	1940-05-06	1940-10-14
1941	1941-04-13	1941-10-07
1942	1942-04-24	1942-10-03
1943	1943-05-06	1943-10-01
1944	1944-04-22	1944-09-21
1945	1945-03-16	1945-09-28
1946	1946-04-22	1946-10-05
1947	1947-04-05	1947-10-16
1948	1948-04-24	1948-09-21
1949	1949-05-03	1949-10-11
1950	1950-03-27	1950-08-28
1951	1951-05-02	1951-10-06
1952	1952-04-22	1952-10-02
1953	1953-05-11	1953-10-21
1954	1954-04-08	1954-10-13
1955	1955-04-19	1955-09-22
1956	1956-04-28	1956-09-24
1957	1957-04-21	1957-09-22
1958	1958-05-16	1958-09-27
1959	1959-05-03	1959-10-06
1960	1960-04-14	1960-09-09
1961	1961-05-09	1961-09-26
1962	1962-04-27	1962-10-16
1963	1963-04-22	1963-09-21
1964	1964-05-07	1964-09-17
1965	1965-05-02	1965-09-23
1966	1966-05-09	1966-09-04
1967	1967-05-28	1967-09-19
1968	1968-05-04	1968-09-25
1969	1969-04-18	1969-10-14
1970	1970-04-30	1970-09-27
1971	1971-05-19	1971-10-02
1972	1972-05-23	1972-09-14
1973	1973-04-22	1973-10-05
1974	1974-04-29	1974-08-28
1975	1975-05-21	1975-09-06
1976	1976-04-18	1976-09-14
1977	1977-04-13	1977-09-19
1978	1978-05-20	1978-09-22
1979	1979-05-08	1979-10-22
1980	1980-05-13	1980-09-22
1982	1982-05-06	1982-09-16
1983	1983-06-11	1983-10-04
1984	1984-04-27	1984-09-24
1985	1985-04-21	1985-10-13
1986	1986-04-01	1986-10-02
1987	1987-04-22	1987-09-28
1988	1988-05-09	1988-10-01
1989	1989-05-26	1989-09-22
1990	1990-04-27	1990-09-08
1991	1991-05-16	1991-09-17
1992	1992-06-18	1992-08-27
1993	1993-05-11	1993-09-15
1994	1994-05-24	1994-08-14
1995	1995-06-09	1995-09-15
1996	1996-05-19	1996-09-10
1997	1997-05-20	1997-10-14
1998	1998-05-15	1998-10-01
1999	1999-05-12	1999-09-29
2000	2000-05-06	2000-08-31
2001	2001-04-12	2001-09-14
2002	2002-04-17	2002-10-05
2003	2003-06-24	2003-09-23
2004	2004-05-10	2004-09-24
2005	2005-05-12	2005-10-07
2007	2007-05-01	2007-10-09
2008	2008-06-02	2008-09-15
2009	2009-04-27	2009-09-24
2010	2010-04-03	2010-10-12
2011	2011-05-13	2011-09-06
2012	2012-03-21	2012-09-15
2013	2013-05-22	2013-10-03
2014	2014-05-08	2014-10-03
2016	2016-05-28	2016-10-19
2017	2017-05-01	2017-10-08
2018	2018-05-14	2018-10-09
2019	2019-05-18	2019-10-04
2020	2020-05-25	2020-09-11
2021	2021-05-22	2021-09-20
2022	2022-04-24	2022-09-22
2023	2023-04-06	2023-10-05
2024	2024-04-16	2024-10-08
2025	2025-06-04	2025-09-30
2026	2026-05-17	2026-10-14

Every Fixed Threshold

Fixed thresholds at Portsmouth-Sciotoville
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	130	110	1939	70
35 C (95 F): Days	103	46	1936	7
40 C (104 F): Days	8	3	1930	3
90 F (32.2 C): Days	129	86	1936	27
100 F (37.8 C): Days	38	17	1936	3
0 C (32 F): Ice days (max	130	40	1977	22
0 C (32 F): Frost days (min	130	131	1917	72
-10 C (14 F): Days with min	129	39	1985	18
-20 C (-4 F): Days with min	38	9	1918	3
-30 C (-22 F): Days with min	1	2	1994	2
20 C (68 F): Tropical nights (min	130	60	1949	45
25 C (77 F): Days with min	20	4	1934	1
10 mm (0.39 in): Days with 10 mm or more rain	126	55	2018	29
25 mm (0.98 in): Days with 25 mm or more rain	126	19	1945	7
50 mm (1.97 in): Days with 50 mm or more rain	95	5	1979	2
100 mm (3.94 in): Days with 100 mm or more rain	5	1	1938	1
10 cm (3.9 in): Days with 10 cm or more snowfall	32	4	1960	1
25 cm (9.8 in): Days with 25 cm or more snowfall	3	1	1960	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Portsmouth-Sciotoville 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).

Portsmouth-Sciotoville Threshold Days by Year (USC00336781)

Key Facts for Portsmouth-Sciotoville Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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