Watertown Wwtp Threshold Days by Year (USC00478919)

17 fixed thresholds counted per year at Watertown Wwtp (USC00478919): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Watertown Wwtp Thresholds

Watertown Wwtp: nights with a minimum temperature at or below 0 C (32 F) in 130 years, most in 1893 with 190.
Watertown Wwtp: nights with a minimum temperature at or below -10 C (14 F) in 130 years, most in 1893 with 101.
Watertown Wwtp: nights with a minimum temperature at or below -20 C (-4 F) in 130 years, most in 1893 with 49.
Watertown Wwtp: days with a maximum temperature at or above 30 C (86 F) in 129 years, most in 1939 with 60.
17 fixed thresholds have at least one qualifying day at Watertown Wwtp.

Days at or above 30 C (86 F)

129 years with a qualifying day

Days per year at Watertown Wwtp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 60 in 1939.

Days at or above 30 C (86 F) per year at Watertown Wwtp
Year	Days	Decade average
1893	22	36
1894	54	36
1895	52	36
1896	41	36
1897	27	36
1898	26	36
1899	30	36
1900	33	16.7
1903	6	16.7
1904	12	16.7
1905	17	16.7
1906	26	16.7
1907	5	16.7
1909	18	16.7
1910	37	25.1
1911	34	25.1
1912	14	25.1
1913	23	25.1
1914	25	25.1
1916	32	25.1
1917	12	25.1
1918	22	25.1
1919	27	25.1
1920	31	25.1
1921	48	25.1
1922	19	25.1
1923	25	25.1
1924	7	25.1
1925	20	25.1
1926	20	25.1
1927	26	25.1
1928	26	25.1
1929	29	25.1
1930	30	40.1
1931	50	40.1
1932	29	40.1
1933	34	40.1
1934	46	40.1
1935	25	40.1
1937	54	40.1
1938	33	40.1
1939	60	40.1
1940	37	45.2
1941	51	45.2
1942	30	45.2
1943	45	45.2
1944	52	45.2
1945	28	45.2
1946	43	45.2
1947	53	45.2
1948	59	45.2
1949	54	45.2
1950	23	33.2
1951	13	33.2
1952	46	33.2
1953	42	33.2
1954	34	33.2
1955	54	33.2
1956	24	33.2
1957	28	33.2
1958	25	33.2
1959	43	33.2
1960	19	29.2
1961	33	29.2
1962	27	29.2
1963	46	29.2
1964	39	29.2
1965	19	29.2
1966	30	29.2
1967	16	29.2
1968	34	29.2
1969	29	29.2
1970	47	36.7
1971	42	36.7
1972	32	36.7
1973	37	36.7
1974	22	36.7
1975	35	36.7
1976	49	36.7
1977	38	36.7
1978	38	36.7
1979	27	36.7
1980	45	31
1981	14	31
1982	14	31
1983	53	31
1984	28	31
1985	24	31
1986	15	31
1987	38	31
1988	54	31
1989	25	31
1990	16	23.1
1991	40	23.1
1992	10	23.1
1993	16	23.1
1994	18	23.1
1995	40	23.1
1996	14	23.1
1997	15	23.1
1998	27	23.1
1999	35	23.1
2000	11	20.3
2001	35	20.3
2002	38	20.3
2003	24	20.3
2004	6	20.3
2005	34	20.3
2006	20	20.3
2007	22	20.3
2008	7	20.3
2009	6	20.3
2010	18	19.6
2011	30	19.6
2012	53	19.6
2013	16	19.6
2014	4	19.6
2015	10	19.6
2016	15	19.6
2017	15	19.6
2018	21	19.6
2019	14	19.6
2020	25	24.6
2021	36	24.6
2022	22	24.6
2023	27	24.6
2024	15	24.6
2025	24	24.6
2026	23	24.6

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

First to last qualifying date each year at Watertown Wwtp
Year	First date	Last date
1893	1893-06-12	1893-09-21
1894	1894-05-16	1894-09-08
1895	1895-05-09	1895-09-25
1896	1896-05-07	1896-08-21
1897	1897-06-13	1897-10-04
1898	1898-06-03	1898-09-29
1899	1899-06-03	1899-09-16
1900	1900-05-12	1900-09-25
1903	1903-07-03	1903-07-28
1904	1904-06-18	1904-08-22
1905	1905-06-05	1905-08-27
1906	1906-05-15	1906-09-16
1907	1907-06-16	1907-09-01
1909	1909-06-22	1909-08-26
1910	1910-06-16	1910-08-24
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	1914-08-24
1916	1916-05-26	1916-08-21
1917	1917-05-17	1917-08-20
1918	1918-05-03	1918-08-25
1919	1919-05-30	1919-09-08
1920	1920-06-08	1920-09-25
1921	1921-05-20	1921-09-04
1922	1922-05-10	1922-09-08
1923	1923-06-01	1923-08-14
1924	1924-06-19	1924-08-30
1925	1925-05-22	1925-09-19
1926	1926-06-29	1926-09-18
1927	1927-06-28	1927-09-17
1928	1928-05-03	1928-08-27
1929	1929-05-28	1929-09-03
1930	1930-04-10	1930-09-23
1931	1931-06-11	1931-09-20
1932	1932-06-22	1932-09-19
1933	1933-06-05	1933-09-08
1934	1934-05-06	1934-08-18
1935	1935-07-03	1935-09-18
1937	1937-05-30	1937-09-23
1938	1938-05-03	1938-09-04
1939	1939-05-19	1939-10-07
1940	1940-05-13	1940-09-20
1941	1941-05-05	1941-09-22
1942	1942-04-30	1942-09-17
1943	1943-06-12	1943-09-03
1944	1944-05-28	1944-09-03
1945	1945-06-23	1945-09-07
1946	1946-06-06	1946-10-06
1947	1947-06-27	1947-10-21
1948	1948-06-01	1948-09-19
1949	1949-05-03	1949-08-27
1950	1950-05-24	1950-10-18
1951	1951-05-16	1951-09-12
1952	1952-04-28	1952-09-28
1953	1953-05-09	1953-10-02
1954	1954-06-09	1954-09-27
1955	1955-05-03	1955-09-18
1956	1956-05-22	1956-08-27
1957	1957-06-16	1957-09-01
1958	1958-06-29	1958-09-03
1959	1959-05-02	1959-09-22
1960	1960-06-27	1960-09-08
1961	1961-06-05	1961-09-10
1962	1962-05-16	1962-09-12
1963	1963-06-02	1963-10-06
1964	1964-05-18	1964-09-09
1965	1965-05-25	1965-08-17
1966	1966-06-21	1966-09-01
1967	1967-05-26	1967-08-16
1968	1968-06-05	1968-09-03
1969	1969-05-16	1969-09-06
1970	1970-04-29	1970-09-07
1971	1971-06-04	1971-10-02
1972	1972-05-18	1972-08-30
1973	1973-06-06	1973-09-03
1974	1974-05-21	1974-08-26
1975	1975-05-18	1975-10-13
1976	1976-06-06	1976-09-08
1977	1977-04-18	1977-08-27
1978	1978-05-26	1978-09-19
1979	1979-05-08	1979-08-30
1980	1980-04-22	1980-09-08
1981	1981-06-15	1981-09-12
1982	1982-05-15	1982-10-01
1983	1983-06-11	1983-09-11
1984	1984-06-06	1984-09-25
1985	1985-04-20	1985-09-08
1986	1986-04-27	1986-07-25
1987	1987-05-18	1987-09-06
1988	1988-05-29	1988-09-18
1989	1989-05-25	1989-08-23
1990	1990-04-26	1990-09-07
1991	1991-05-12	1991-09-16
1992	1992-05-17	1992-08-26
1993	1993-06-23	1993-08-31
1994	1994-05-22	1994-09-16
1995	1995-06-07	1995-09-06
1996	1996-05-18	1996-09-06
1997	1997-06-23	1997-10-06
1998	1998-05-19	1998-09-27
1999	1999-05-30	1999-09-06
2000	2000-06-09	2000-09-11
2001	2001-05-16	2001-09-04
2002	2002-04-16	2002-09-10
2003	2003-06-24	2003-09-12
2004	2004-06-08	2004-08-04
2005	2005-06-08	2005-09-22
2006	2006-05-28	2006-08-05
2007	2007-05-15	2007-10-07
2008	2008-07-12	2008-09-03
2009	2009-06-21	2009-08-09
2010	2010-05-24	2010-09-24
2011	2011-05-31	2011-09-02
2012	2012-05-20	2012-09-05
2013	2013-07-08	2013-09-11
2014	2014-06-02	2014-08-23
2015	2015-07-18	2015-09-07
2016	2016-06-11	2016-09-07
2017	2017-06-11	2017-09-26
2018	2018-05-27	2018-09-18
2019	2019-06-28	2019-07-29
2020	2020-06-03	2020-08-29
2021	2021-05-02	2021-09-20
2022	2022-05-11	2022-08-07
2023	2023-05-31	2023-09-06
2024	2024-06-17	2024-09-22
2025	2025-06-18	2025-10-05
2026	2026-05-27	2026-09-03

Every Fixed Threshold

Fixed thresholds at Watertown Wwtp
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	129	60	1939	23
35 C (95 F): Days	73	22	1988	2
90 F (32.2 C): Days	127	43	1988	9
100 F (37.8 C): Days	16	8	1947	4
0 C (32 F): Ice days (max	129	90	2014	37
0 C (32 F): Frost days (min	130	190	1893	91
-10 C (14 F): Days with min	130	101	1893	36
-20 C (-4 F): Days with min	130	49	1893	11
-30 C (-22 F): Days with min	36	6	1893	5
20 C (68 F): Tropical nights (min	127	33	1931	14
25 C (77 F): Days with min	13	2	1895	1
10 mm (0.39 in): Days with 10 mm or more rain	126	48	2018	27
25 mm (0.98 in): Days with 25 mm or more rain	126	13	2006	6
50 mm (1.97 in): Days with 50 mm or more rain	82	7	2008	2
100 mm (3.94 in): Days with 100 mm or more rain	9	2	2010	1
10 cm (3.9 in): Days with 10 cm or more snowfall	92	9	1951	1
25 cm (9.8 in): Days with 25 cm or more snowfall	11	2	1979	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 Watertown 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).

Watertown Wwtp Threshold Days by Year (USC00478919)

Key Facts for Watertown Wwtp Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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