Watertown Threshold Days by Year (USC00309000)

17 fixed thresholds counted per year at Watertown (USC00309000): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Watertown Thresholds

Watertown: days with a maximum temperature at or below 0 C (32 F) in 127 years, most in 1904 with 86.
Watertown: days with a maximum temperature at or above 30 C (86 F) in 126 years, most in 1898 with 43.
Watertown: nights with a minimum temperature at or below 0 C (32 F) in 126 years, most in 1978 with 173.
Watertown: nights with a minimum temperature at or below -10 C (14 F) in 126 years, most in 1904 with 82.
17 fixed thresholds have at least one qualifying day at Watertown.

Days at or above 30 C (86 F)

126 years with a qualifying day

Days per year at Watertown with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 43 in 1898.

Days at or above 30 C (86 F) per year at Watertown
Year	Days	Decade average
1898	43	35.5
1899	28	35.5
1900	25	11
1901	20	11
1902	8	11
1903	5	11
1904	3	11
1905	6	11
1906	17	11
1907	6	11
1908	14	11
1909	6	11
1911	24	18.4
1912	10	18.4
1913	14	18.4
1914	14	18.4
1915	8	18.4
1916	39	18.4
1917	14	18.4
1918	21	18.4
1919	22	18.4
1920	12	18.4
1921	40	18.4
1922	21	18.4
1923	31	18.4
1924	15	18.4
1925	24	18.4
1926	8	18.4
1927	7	18.4
1928	12	18.4
1929	14	18.4
1930	17	22.3
1931	27	22.3
1932	17	22.3
1933	27	22.3
1934	26	22.3
1935	19	22.3
1936	18	22.3
1937	25	22.3
1938	17	22.3
1939	30	22.3
1940	11	18.7
1941	22	18.7
1942	16	18.7
1943	18	18.7
1944	28	18.7
1945	15	18.7
1946	13	18.7
1947	18	18.7
1948	9	18.7
1949	37	18.7
1950	7	13.8
1951	3	13.8
1952	22	13.8
1953	22	13.8
1954	3	13.8
1955	41	13.8
1956	6	13.8
1957	10	13.8
1958	1	13.8
1959	23	13.8
1960	8	12.2
1961	13	12.2
1962	7	12.2
1963	17	12.2
1964	22	12.2
1965	10	12.2
1966	19	12.2
1967	6	12.2
1968	9	12.2
1969	11	12.2
1970	14	13.2
1971	10	13.2
1972	6	13.2
1973	31	13.2
1974	6	13.2
1975	14	13.2
1976	2	13.2
1977	12	13.2
1978	21	13.2
1979	16	13.2
1980	9	12.3
1981	3	12.3
1982	7	12.3
1983	25	12.3
1984	13	12.3
1985	8	12.3
1986	3	12.3
1987	15	12.3
1988	26	12.3
1989	14	12.3
1990	11	14
1991	10	14
1993	11	14
1994	13	14
1995	21	14
1996	10	14
1997	11	14
1998	11	14
1999	28	14
2000	3	13.1
2001	21	13.1
2002	27	13.1
2003	5	13.1
2004	2	13.1
2005	27	13.1
2006	10	13.1
2008	11	13.1
2009	12	13.1
2010	24	18.8
2011	18	18.8
2012	34	18.8
2013	14	18.8
2014	10	18.8
2015	16	18.8
2016	28	18.8
2017	6	18.8
2018	27	18.8
2019	11	18.8
2020	25	11.6
2021	13	11.6
2022	13	11.6
2023	2	11.6
2024	5	11.6
2025	15	11.6
2026	8	11.6

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

First to last qualifying date each year at Watertown
Year	First date	Last date
1898	1898-05-21	1898-10-03
1899	1899-04-30	1899-09-18
1900	1900-06-06	1900-09-03
1901	1901-06-13	1901-08-23
1902	1902-05-22	1902-08-31
1903	1903-06-09	1903-09-15
1904	1904-06-20	1904-08-25
1905	1905-06-15	1905-08-10
1906	1906-06-08	1906-09-12
1907	1907-06-18	1907-08-12
1908	1908-05-28	1908-08-04
1909	1909-06-28	1909-08-25
1911	1911-05-20	1911-08-08
1912	1912-07-03	1912-07-15
1913	1913-05-04	1913-09-02
1914	1914-06-24	1914-09-22
1915	1915-06-07	1915-09-16
1916	1916-07-11	1916-09-27
1917	1917-06-13	1917-08-22
1918	1918-05-18	1918-08-23
1919	1919-06-02	1919-07-27
1920	1920-06-01	1920-09-27
1921	1921-06-10	1921-09-29
1922	1922-06-08	1922-09-11
1923	1923-06-05	1923-09-26
1924	1924-06-20	1924-09-01
1925	1925-06-02	1925-09-20
1926	1926-07-03	1926-08-06
1927	1927-06-30	1927-08-08
1928	1928-06-13	1928-08-28
1929	1929-06-18	1929-09-05
1930	1930-06-05	1930-09-12
1931	1931-05-29	1931-09-22
1932	1932-05-16	1932-09-20
1933	1933-06-07	1933-08-07
1934	1934-06-02	1934-09-26
1935	1935-07-03	1935-08-20
1936	1936-06-10	1936-09-23
1937	1937-07-05	1937-09-03
1938	1938-06-21	1938-08-21
1939	1939-05-27	1939-09-17
1940	1940-07-22	1940-08-30
1941	1941-06-07	1941-09-05
1942	1942-05-14	1942-09-18
1943	1943-06-04	1943-09-06
1944	1944-05-03	1944-08-31
1945	1945-06-29	1945-09-09
1946	1946-06-25	1946-08-09
1947	1947-06-11	1947-09-14
1948	1948-06-30	1948-09-07
1949	1949-06-13	1949-08-28
1950	1950-06-10	1950-08-28
1951	1951-07-10	1951-09-14
1952	1952-06-18	1952-09-14
1953	1953-06-21	1953-09-05
1954	1954-06-23	1954-08-24
1955	1955-05-23	1955-09-19
1956	1956-06-15	1956-08-12
1957	1957-06-17	1957-08-04
1958	1958-09-01	1958-09-01
1959	1959-06-12	1959-09-30
1960	1960-06-29	1960-09-10
1961	1961-06-14	1961-09-26
1962	1962-05-17	1962-09-01
1963	1963-06-27	1963-08-04
1964	1964-06-10	1964-09-11
1965	1965-06-07	1965-09-23
1966	1966-05-25	1966-08-10
1967	1967-06-12	1967-08-18
1968	1968-07-02	1968-08-25
1969	1969-06-13	1969-09-02
1970	1970-05-01	1970-09-25
1971	1971-05-20	1971-09-07
1972	1972-06-16	1972-07-22
1973	1973-06-12	1973-09-06
1974	1974-06-07	1974-08-23
1975	1975-05-24	1975-08-26
1976	1976-06-16	1976-06-20
1977	1977-05-22	1977-08-30
1978	1978-05-28	1978-08-20
1979	1979-05-09	1979-08-03
1980	1980-06-25	1980-08-31
1981	1981-06-17	1981-07-10
1982	1982-07-07	1982-09-14
1983	1983-06-15	1983-09-21
1984	1984-06-08	1984-08-14
1985	1985-07-06	1985-08-15
1986	1986-07-07	1986-07-26
1987	1987-05-31	1987-08-18
1988	1988-06-15	1988-08-15
1989	1989-05-20	1989-09-11
1990	1990-04-28	1990-08-05
1991	1991-05-17	1991-09-17
1993	1993-06-26	1993-09-01
1994	1994-06-14	1994-08-05
1995	1995-06-20	1995-08-21
1996	1996-05-20	1996-09-07
1997	1997-06-11	1997-08-17
1998	1998-05-17	1998-08-10
1999	1999-06-01	1999-09-07
2000	2000-06-17	2000-09-02
2001	2001-06-15	2001-09-10
2002	2002-06-22	2002-09-15
2003	2003-06-27	2003-08-14
2004	2004-05-14	2004-07-23
2005	2005-06-07	2005-10-06
2006	2006-05-30	2006-07-27
2008	2008-04-20	2008-09-15
2009	2009-04-28	2009-08-21
2010	2010-04-03	2010-09-25
2011	2011-06-01	2011-08-21
2012	2012-04-17	2012-08-27
2013	2013-06-01	2013-09-12
2014	2014-05-16	2014-09-06
2015	2015-05-09	2015-09-09
2016	2016-05-29	2016-09-08
2017	2017-06-18	2017-09-27
2018	2018-05-31	2018-09-17
2019	2019-07-05	2019-08-07
2020	2020-05-27	2020-08-24
2021	2021-05-22	2021-08-27
2022	2022-06-17	2022-08-30
2023	2023-06-03	2023-07-07
2024	2024-05-23	2024-07-31
2025	2025-06-05	2025-08-17
2026	2026-05-19	2026-08-06

Every Fixed Threshold

Fixed thresholds at Watertown
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	126	43	1898	8
35 C (95 F): Days	17	4	1916	1
90 F (32.2 C): Days	97	21	1898	3
0 C (32 F): Ice days (max	127	86	1904	48
0 C (32 F): Frost days (min	126	173	1978	94
-10 C (14 F): Days with min	126	82	1904	44
-20 C (-4 F): Days with min	126	31	2015	11
-30 C (-22 F): Days with min	58	7	1979	2
20 C (68 F): Tropical nights (min	126	30	2018	8
25 C (77 F): Days with min	11	1	1911	1
10 mm (0.39 in): Days with 10 mm or more rain	125	53	2008	33
25 mm (0.98 in): Days with 25 mm or more rain	125	17	1976	9
50 mm (1.97 in): Days with 50 mm or more rain	70	3	1906	2
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1949	1
10 cm (3.9 in): Days with 10 cm or more snowfall	95	22	1985	10
25 cm (9.8 in): Days with 25 cm or more snowfall	62	8	1985	4
50 cm (19.7 in): Days with 50 cm or more snowfall	11	1	1920	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1898.

Download the Data

Data for Watertown 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Watertown Threshold Days by Year (USC00309000)

Key Facts for Watertown Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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