Porthill Threshold Days by Year (USC00107264)

16 fixed thresholds counted per year at Porthill (USC00107264): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Porthill Thresholds

Porthill: days with a maximum temperature at or above 30 C (86 F) in 117 years, most in 2017 with 71.
Porthill: days with a maximum temperature at or below 0 C (32 F) in 117 years, most in 1916 with 72.
Porthill: nights with a minimum temperature at or below 0 C (32 F) in 116 years, most in 1899 with 226.
Porthill: nights with a minimum temperature at or below -10 C (14 F) in 116 years, most in 1916 with 65.
16 fixed thresholds have at least one qualifying day at Porthill.

Days at or above 30 C (86 F)

117 years with a qualifying day

Days per year at Porthill with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 71 in 2017.

Days at or above 30 C (86 F) per year at Porthill
Year	Days	Decade average
1893	16	24
1894	15	24
1895	22	24
1896	18	24
1897	52	24
1899	21	24
1900	19	15.1
1902	14	15.1
1903	2	15.1
1904	20	15.1
1905	19	15.1
1906	29	15.1
1907	4	15.1
1908	17	15.1
1909	12	15.1
1910	18	13.3
1911	8	13.3
1912	8	13.3
1913	13	13.3
1914	14	13.3
1915	22	13.3
1916	1	13.3
1917	15	13.3
1918	13	13.3
1919	21	13.3
1920	18	17.2
1921	19	17.2
1922	12	17.2
1923	13	17.2
1924	17	17.2
1925	16	17.2
1926	27	17.2
1927	12	17.2
1928	20	17.2
1929	18	17.2
1930	24	27.4
1931	36	27.4
1932	21	27.4
1933	20	27.4
1934	18	27.4
1935	15	27.4
1936	46	27.4
1937	28	27.4
1938	34	27.4
1939	32	27.4
1940	49	33
1941	28	33
1942	36	33
1943	28	33
1944	43	33
1945	51	33
1946	28	33
1947	30	33
1948	9	33
1949	28	33
1950	24	28.6
1951	31	28.6
1952	32	28.6
1953	32	28.6
1954	19	28.6
1955	34	28.6
1956	37	28.6
1957	20	28.6
1959	28	28.6
1960	34	28.6
1961	38	28.6
1962	19	28.6
1963	24	28.6
1964	15	28.6
1965	28	28.6
1966	25	28.6
1967	53	28.6
1968	21	28.6
1969	29	28.6
1970	46	30.5
1971	36	30.5
1972	25	30.5
1973	43	30.5
1974	25	30.5
1975	21	30.5
1976	10	30.5
1977	36	30.5
1978	23	30.5
1979	40	30.5
1980	12	27.5
1981	21	27.5
1982	19	27.5
1983	22	27.5
1984	30	27.5
1985	40	27.5
1986	38	27.5
1987	30	27.5
1988	38	27.5
1989	25	27.5
1990	34	29.8
1991	25	29.8
1992	33	29.8
1993	18	29.8
1994	41	29.8
1995	18	29.8
1996	33	29.8
1997	21	29.8
1998	47	29.8
1999	28	29.8
2000	36	38.4
2001	42	38.4
2002	26	38.4
2003	49	38.4
2006	39	38.4
2011	31	38.9
2012	26	38.9
2013	27	38.9
2014	30	38.9
2017	71	38.9
2018	41	38.9
2019	46	38.9
2020	45	45

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

First to last qualifying date each year at Porthill
Year	First date	Last date
1893	1893-07-17	1893-08-31
1894	1894-05-31	1894-08-21
1895	1895-05-18	1895-08-30
1896	1896-05-30	1896-08-29
1897	1897-05-05	1897-08-29
1899	1899-07-09	1899-08-08
1900	1900-06-22	1900-08-02
1902	1902-06-08	1902-08-14
1903	1903-07-22	1903-08-19
1904	1904-06-30	1904-09-05
1905	1905-07-08	1905-08-13
1906	1906-07-03	1906-09-19
1907	1907-07-30	1907-08-02
1908	1908-06-24	1908-08-19
1909	1909-06-30	1909-08-19
1910	1910-06-26	1910-08-20
1911	1911-07-16	1911-07-29
1912	1912-06-19	1912-08-24
1913	1913-07-19	1913-08-26
1914	1914-06-17	1914-08-14
1915	1915-07-22	1915-08-29
1916	1916-08-26	1916-08-26
1917	1917-06-16	1917-08-20
1918	1918-06-09	1918-08-25
1919	1919-06-19	1919-08-21
1920	1920-07-01	1920-08-16
1921	1921-07-07	1921-08-30
1922	1922-06-28	1922-08-27
1923	1923-07-01	1923-08-17
1924	1924-05-15	1924-07-31
1925	1925-06-19	1925-08-21
1926	1926-04-29	1926-08-25
1927	1927-07-07	1927-08-16
1928	1928-07-11	1928-09-03
1929	1929-07-01	1929-08-31
1930	1930-07-05	1930-08-30
1931	1931-05-12	1931-09-03
1932	1932-06-23	1932-08-27
1933	1933-06-14	1933-08-27
1934	1934-05-29	1934-09-06
1935	1935-07-13	1935-09-10
1936	1936-05-26	1936-08-30
1937	1937-06-01	1937-09-16
1938	1938-06-25	1938-09-20
1939	1939-04-28	1939-09-10
1940	1940-05-22	1940-09-11
1941	1941-05-23	1941-08-19
1942	1942-06-30	1942-09-06
1943	1943-06-28	1943-08-29
1944	1944-05-27	1944-09-13
1945	1945-05-03	1945-09-14
1946	1946-07-05	1946-08-25
1947	1947-05-26	1947-09-04
1948	1948-06-08	1948-07-23
1949	1949-06-05	1949-09-09
1950	1950-06-19	1950-09-04
1951	1951-06-14	1951-08-22
1952	1952-06-09	1952-09-26
1953	1953-07-07	1953-09-12
1954	1954-05-18	1954-08-13
1955	1955-06-10	1955-09-07
1956	1956-05-31	1956-09-09
1957	1957-05-30	1957-09-07
1959	1959-05-14	1959-08-10
1960	1960-05-11	1960-08-19
1961	1961-06-15	1961-08-30
1962	1962-06-24	1962-09-06
1963	1963-06-15	1963-09-09
1964	1964-07-01	1964-08-17
1965	1965-06-09	1965-08-22
1966	1966-05-26	1966-09-06
1967	1967-06-20	1967-09-28
1968	1968-06-25	1968-08-31
1969	1969-05-23	1969-09-12
1970	1970-06-02	1970-09-01
1971	1971-07-16	1971-08-30
1972	1972-05-29	1972-08-29
1973	1973-05-14	1973-09-11
1974	1974-06-14	1974-08-05
1975	1975-07-03	1975-08-15
1976	1976-06-29	1976-09-01
1977	1977-06-07	1977-08-22
1978	1978-06-04	1978-08-10
1979	1979-06-02	1979-09-15
1980	1980-07-08	1980-07-31
1981	1981-07-04	1981-09-09
1982	1982-06-12	1982-08-26
1983	1983-05-25	1983-08-20
1984	1984-05-29	1984-09-18
1985	1985-05-18	1985-08-30
1986	1986-05-26	1986-08-29
1987	1987-05-09	1987-09-12
1988	1988-05-12	1988-09-14
1989	1989-06-05	1989-08-11
1990	1990-06-24	1990-09-11
1991	1991-07-02	1991-09-06
1992	1992-05-06	1992-08-19
1993	1993-05-11	1993-09-10
1994	1994-05-09	1994-09-25
1995	1995-05-29	1995-09-15
1996	1996-06-07	1996-08-30
1997	1997-06-15	1997-09-01
1998	1998-07-02	1998-09-17
1999	1999-05-25	1999-09-24
2000	2000-06-30	2000-08-26
2001	2001-05-23	2001-09-25
2002	2002-06-15	2002-08-29
2003	2003-06-08	2003-09-07
2006	2006-05-20	2006-09-13
2011	2011-07-06	2011-09-24
2012	2012-07-09	2012-08-28
2013	2013-07-01	2013-09-16
2014	2014-07-03	2014-08-28
2017	2017-05-23	2017-09-13
2018	2018-05-24	2018-09-08
2019	2019-05-29	2019-09-06
2020	2020-06-23	2020-09-12

Every Fixed Threshold

Fixed thresholds at Porthill
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	117	71	2017	45
35 C (95 F): Days	79	22	2017	13
90 F (32.2 C): Days	115	53	2017	29
100 F (37.8 C): Days	19	4	2020	4
0 C (32 F): Ice days (max	117	72	1916	15
0 C (32 F): Frost days (min	116	226	1899	151
-10 C (14 F): Days with min	116	65	1916	3
-20 C (-4 F): Days with min	91	20	1950	8
-30 C (-22 F): Days with min	15	6	1950	2
20 C (68 F): Tropical nights (min	6	1	1894	1
10 mm (0.39 in): Days with 10 mm or more rain	106	35	1897	6
25 mm (0.98 in): Days with 25 mm or more rain	50	6	1897	1
50 mm (1.97 in): Days with 50 mm or more rain	5	3	1900	1
10 cm (3.9 in): Days with 10 cm or more snowfall	64	13	1949	1
25 cm (9.8 in): Days with 25 cm or more snowfall	21	5	1954	1
50 cm (19.7 in): Days with 50 cm or more snowfall	2	2	1954	2

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 Porthill 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).

Porthill Threshold Days by Year (USC00107264)

Key Facts for Porthill Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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