Plymouth Wwtp Threshold Days by Year (USC00476678)

18 fixed thresholds counted per year at Plymouth Wwtp (USC00476678): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Plymouth Wwtp Thresholds

Plymouth Wwtp: days with 10 mm (0.39 in) or more of precipitation in 110 years, most in 1965 with 39.
Plymouth Wwtp: days with 25 mm (0.98 in) or more of precipitation in 110 years, most in 1973 with 13.
Plymouth Wwtp: days with a maximum temperature at or above 30 C (86 F) in 109 years, most in 2005 with 54.
Plymouth Wwtp: days with a maximum temperature at or below 0 C (32 F) in 109 years, most in 2014 with 88.
18 fixed thresholds have at least one qualifying day at Plymouth Wwtp.

Days at or above 30 C (86 F)

109 years with a qualifying day

Days per year at Plymouth Wwtp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 54 in 2005.

Days at or above 30 C (86 F) per year at Plymouth Wwtp
Year	Days	Decade average
1911	33	19.4
1912	13	19.4
1913	23	19.4
1914	22	19.4
1915	2	19.4
1916	28	19.4
1917	11	19.4
1918	20	19.4
1919	23	19.4
1920	16	19
1921	50	19
1922	15	19
1923	24	19
1924	4	19
1925	20	19
1926	10	19
1927	13	19
1932	21	27.3
1933	26	27.3
1934	35	27.3
1935	16	27.3
1936	35	27.3
1937	40	27.3
1938	17	27.3
1939	28	27.3
1940	16	22.5
1941	30	22.5
1942	12	22.5
1943	22	22.5
1944	26	22.5
1945	15	22.5
1946	19	22.5
1947	31	22.5
1948	29	22.5
1949	25	22.5
1950	6	21.2
1951	4	21.2
1952	33	21.2
1953	25	21.2
1955	40	21.2
1956	10	21.2
1957	19	21.2
1958	18	21.2
1959	36	21.2
1960	10	19.7
1961	20	19.7
1962	10	19.7
1963	17	19.7
1964	28	19.7
1965	11	19.7
1966	37	19.7
1967	9	19.7
1968	26	19.7
1969	29	19.7
1970	42	24.9
1971	30	24.9
1972	17	24.9
1973	26	24.9
1974	15	24.9
1975	29	24.9
1976	37	24.9
1977	20	24.9
1978	24	24.9
1979	9	24.9
1980	23	22.9
1981	12	22.9
1982	11	22.9
1983	39	22.9
1984	14	22.9
1985	14	22.9
1986	15	22.9
1987	33	22.9
1988	52	22.9
1989	16	22.9
1990	20	16.6
1993	9	16.6
1994	14	16.6
1995	23	16.6
1996	11	16.6
1997	11	16.6
1998	22	16.6
1999	23	16.6
2000	7	21.2
2001	28	21.2
2002	32	21.2
2003	19	21.2
2004	5	21.2
2005	54	21.2
2006	22	21.2
2007	25	21.2
2008	10	21.2
2009	10	21.2
2010	21	19.5
2011	24	19.5
2012	42	19.5
2013	19	19.5
2014	2	19.5
2015	12	19.5
2016	22	19.5
2017	13	19.5
2018	26	19.5
2019	14	19.5
2020	22	20.9
2021	31	20.9
2022	18	20.9
2023	21	20.9
2024	13	20.9
2025	23	20.9
2026	18	20.9

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

First to last qualifying date each year at Plymouth Wwtp
Year	First date	Last date
1911	1911-05-18	1911-09-01
1912	1912-06-25	1912-09-09
1913	1913-06-15	1913-09-07
1914	1914-05-26	1914-09-20
1915	1915-07-12	1915-07-13
1916	1916-07-01	1916-08-21
1917	1917-07-08	1917-08-19
1918	1918-05-31	1918-08-25
1919	1919-05-31	1919-09-08
1920	1920-06-09	1920-09-26
1921	1921-05-21	1921-09-02
1922	1922-06-07	1922-09-06
1923	1923-06-02	1923-09-05
1924	1924-07-23	1924-08-30
1925	1925-05-22	1925-09-17
1926	1926-07-07	1926-09-18
1927	1927-06-28	1927-09-15
1932	1932-07-12	1932-09-19
1933	1933-06-07	1933-09-25
1934	1934-05-06	1934-08-18
1935	1935-07-04	1935-09-24
1936	1936-06-14	1936-09-14
1937	1937-05-30	1937-09-23
1938	1938-06-20	1938-10-10
1939	1939-05-30	1939-09-15
1940	1940-06-03	1940-09-20
1941	1941-05-20	1941-09-22
1942	1942-06-29	1942-09-01
1943	1943-06-12	1943-08-13
1944	1944-05-30	1944-08-22
1945	1945-06-24	1945-09-07
1946	1946-06-16	1946-09-27
1947	1947-06-27	1947-09-19
1948	1948-06-02	1948-09-17
1949	1949-05-04	1949-08-26
1950	1950-06-23	1950-08-16
1951	1951-07-24	1951-07-29
1952	1952-05-01	1952-09-28
1953	1953-06-12	1953-09-03
1955	1955-06-20	1955-09-18
1956	1956-05-22	1956-08-05
1957	1957-06-16	1957-09-01
1958	1958-06-29	1958-09-03
1959	1959-05-02	1959-09-09
1960	1960-07-12	1960-09-08
1961	1961-06-05	1961-09-10
1962	1962-05-16	1962-08-29
1963	1963-06-03	1963-10-06
1964	1964-06-09	1964-09-07
1965	1965-06-20	1965-08-15
1966	1966-06-20	1966-09-01
1967	1967-06-14	1967-07-29
1968	1968-06-05	1968-09-03
1969	1969-05-28	1969-10-01
1970	1970-05-21	1970-09-08
1971	1971-06-04	1971-10-02
1972	1972-05-20	1972-08-30
1973	1973-06-08	1973-09-03
1974	1974-07-01	1974-08-26
1975	1975-05-18	1975-10-13
1976	1976-06-07	1976-10-01
1977	1977-05-13	1977-08-27
1978	1978-05-26	1978-09-19
1979	1979-06-15	1979-08-07
1980	1980-04-22	1980-08-26
1981	1981-06-05	1981-08-13
1982	1982-07-05	1982-09-11
1983	1983-06-11	1983-09-10
1984	1984-06-06	1984-08-29
1985	1985-06-08	1985-09-07
1986	1986-05-30	1986-08-16
1987	1987-05-17	1987-08-16
1988	1988-05-29	1988-08-17
1989	1989-05-24	1989-08-22
1990	1990-04-25	1990-09-06
1993	1993-07-06	1993-08-28
1994	1994-05-22	1994-09-16
1995	1995-06-18	1995-09-06
1996	1996-05-19	1996-09-05
1997	1997-06-23	1997-08-03
1998	1998-05-19	1998-09-14
1999	1999-05-30	1999-09-05
2000	2000-06-09	2000-09-01
2001	2001-06-14	2001-08-10
2002	2002-04-16	2002-09-10
2003	2003-06-24	2003-09-07
2004	2004-06-09	2004-09-13
2005	2005-06-06	2005-10-05
2006	2006-05-29	2006-08-05
2007	2007-05-15	2007-10-08
2008	2008-06-06	2008-09-02
2009	2009-06-21	2009-08-16
2010	2010-05-25	2010-09-24
2011	2011-06-05	2011-09-13
2012	2012-05-21	2012-09-13
2013	2013-05-01	2013-09-11
2014	2014-05-27	2014-07-23
2015	2015-07-18	2015-09-08
2016	2016-06-11	2016-09-07
2017	2017-06-11	2017-09-26
2018	2018-05-26	2018-09-18
2019	2019-06-30	2019-08-06
2020	2020-05-26	2020-08-27
2021	2021-05-23	2021-08-30
2022	2022-05-14	2022-09-02
2023	2023-05-31	2023-09-06
2024	2024-06-13	2024-08-27
2025	2025-06-22	2025-10-05
2026	2026-05-27	2026-08-31

Every Fixed Threshold

Fixed thresholds at Plymouth Wwtp
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	109	54	2005	18
35 C (95 F): Days	53	17	2005	1
40 C (104 F): Days	2	4	1936	3
90 F (32.2 C): Days	100	39	1988	6
100 F (37.8 C): Days	12	8	1936	2
0 C (32 F): Ice days (max	109	88	2014	39
0 C (32 F): Frost days (min	109	178	1926	101
-10 C (14 F): Days with min	109	81	2014	38
-20 C (-4 F): Days with min	108	30	1963	8
-30 C (-22 F): Days with min	18	5	2019	5
20 C (68 F): Tropical nights (min	108	30	1988	7
25 C (77 F): Days with min	21	5	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	110	39	1965	24
25 mm (0.98 in): Days with 25 mm or more rain	110	13	1973	6
50 mm (1.97 in): Days with 50 mm or more rain	66	5	1938	1
100 mm (3.94 in): Days with 100 mm or more rain	6	1	1924	1
10 cm (3.9 in): Days with 10 cm or more snowfall	97	9	1974	1
25 cm (9.8 in): Days with 25 cm or more snowfall	29	2	1959	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1911.

Download the Data

Data for Plymouth Wwtp 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).

Plymouth Wwtp Threshold Days by Year (USC00476678)

Key Facts for Plymouth Wwtp Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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