Watertown Rgnl AP Threshold Days by Year (USW00014946)

20 fixed thresholds counted per year at Watertown Rgnl AP (USW00014946): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Watertown Rgnl AP Thresholds

Watertown Rgnl AP: days with a maximum temperature at or above 30 C (86 F) in 125 years, most in 1933 with 80.
Watertown Rgnl AP: days with a maximum temperature at or above 90 F (32.2 C) in 125 years, most in 1933 with 53.
Watertown Rgnl AP: days with a maximum temperature at or below 0 C (32 F) in 125 years, most in 1975 with 113.
Watertown Rgnl AP: nights with a minimum temperature at or below 0 C (32 F) in 125 years, most in 1907 with 204.
20 fixed thresholds have at least one qualifying day at Watertown Rgnl AP.

Days at or above 30 C (86 F)

125 years with a qualifying day

Days per year at Watertown Rgnl AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 1933.

Days at or above 30 C (86 F) per year at Watertown Rgnl AP
Year	Days	Decade average
1898	26	23
1899	20	23
1900	45	17.6
1903	7	17.6
1904	9	17.6
1905	19	17.6
1906	7	17.6
1907	7	17.6
1908	13	17.6
1909	34	17.6
1910	41	30.3
1911	42	30.3
1912	18	30.3
1913	39	30.3
1914	30	30.3
1915	4	30.3
1916	30	30.3
1917	29	30.3
1918	28	30.3
1919	42	30.3
1920	30	32.7
1921	52	32.7
1922	50	32.7
1923	29	32.7
1924	9	32.7
1925	40	32.7
1926	34	32.7
1927	18	32.7
1928	25	32.7
1929	40	32.7
1930	52	60.3
1931	63	60.3
1932	55	60.3
1933	80	60.3
1934	66	60.3
1935	56	60.3
1936	68	60.3
1937	57	60.3
1938	51	60.3
1939	55	60.3
1940	38	31.3
1941	42	31.3
1942	13	31.3
1943	35	31.3
1944	28	31.3
1945	22	31.3
1946	20	31.3
1947	35	31.3
1948	36	31.3
1949	44	31.3
1950	21	31
1951	9	31
1952	40	31
1953	33	31
1954	26	31
1955	41	31
1956	19	31
1957	31	31
1958	37	31
1959	53	31
1960	36	28.4
1961	40	28.4
1962	18	28.4
1963	22	28.4
1964	46	28.4
1965	17	28.4
1966	30	28.4
1967	26	28.4
1968	24	28.4
1969	25	28.4
1970	47	35
1971	30	35
1972	21	35
1973	37	35
1974	42	35
1975	38	35
1976	56	35
1977	22	35
1978	39	35
1979	18	35
1980	36	37.4
1981	18	37.4
1982	32	37.4
1983	54	37.4
1984	26	37.4
1986	21	37.4
1987	50	37.4
1988	65	37.4
1989	35	37.4
1990	35	20.8
1991	30	20.8
1992	10	20.8
1993	8	20.8
1994	15	20.8
1995	31	20.8
1997	19	20.8
1998	15	20.8
1999	24	20.8
2000	23	28.2
2001	38	28.2
2002	37	28.2
2003	31	28.2
2004	18	28.2
2005	39	28.2
2006	36	28.2
2007	37	28.2
2008	12	28.2
2009	11	28.2
2010	25	24.6
2011	27	24.6
2012	54	24.6
2013	27	24.6
2014	5	24.6
2015	21	24.6
2016	30	24.6
2017	20	24.6
2018	24	24.6
2019	13	24.6
2020	29	31
2021	41	31
2022	26	31
2023	45	31
2024	19	31
2025	25	31
2026	32	31

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

First to last qualifying date each year at Watertown Rgnl AP
Year	First date	Last date
1898	1898-05-25	1898-09-21
1899	1899-04-24	1899-09-01
1900	1900-05-11	1900-09-09
1903	1903-06-28	1903-08-21
1904	1904-06-19	1904-08-27
1905	1905-06-04	1905-09-11
1906	1906-05-11	1906-09-09
1907	1907-07-03	1907-08-30
1908	1908-07-16	1908-09-22
1909	1909-05-04	1909-10-05
1910	1910-04-28	1910-10-16
1911	1911-05-09	1911-09-02
1912	1912-06-26	1912-09-09
1913	1913-05-01	1913-10-04
1914	1914-05-27	1914-09-01
1915	1915-05-12	1915-08-16
1916	1916-05-06	1916-09-05
1917	1917-05-17	1917-08-27
1918	1918-05-04	1918-09-08
1919	1919-05-27	1919-09-26
1920	1920-06-08	1920-10-06
1921	1921-05-21	1921-09-01
1922	1922-06-04	1922-10-04
1923	1923-06-01	1923-09-05
1924	1924-07-10	1924-08-28
1925	1925-05-19	1925-09-19
1926	1926-05-01	1926-09-01
1927	1927-06-19	1927-09-14
1928	1928-05-08	1928-08-19
1929	1929-06-10	1929-09-23
1930	1930-05-21	1930-09-23
1931	1931-04-12	1931-09-13
1932	1932-05-13	1932-09-30
1933	1933-05-17	1933-10-14
1934	1934-04-28	1934-10-11
1935	1935-06-09	1935-09-24
1936	1936-05-15	1936-09-22
1937	1937-05-28	1937-09-23
1938	1938-06-05	1938-10-03
1939	1939-04-23	1939-09-22
1940	1940-05-31	1940-09-19
1941	1941-05-14	1941-09-20
1942	1942-07-08	1942-09-10
1943	1943-05-28	1943-09-02
1944	1944-05-15	1944-08-21
1945	1945-06-22	1945-09-06
1946	1946-06-06	1946-08-20
1947	1947-07-03	1947-10-05
1948	1948-05-19	1948-09-17
1949	1949-05-03	1949-08-26
1950	1950-05-22	1950-09-02
1951	1951-07-15	1951-10-01
1952	1952-05-03	1952-09-27
1953	1953-05-29	1953-10-02
1954	1954-06-23	1954-09-01
1955	1955-05-02	1955-09-17
1956	1956-06-09	1956-09-27
1957	1957-07-02	1957-08-31
1958	1958-05-12	1958-10-15
1959	1959-05-01	1959-09-14
1960	1960-06-26	1960-09-20
1961	1961-06-08	1961-09-09
1962	1962-04-24	1962-08-27
1963	1963-06-04	1963-10-05
1964	1964-04-16	1964-09-09
1965	1965-05-01	1965-09-02
1966	1966-05-26	1966-08-30
1967	1967-05-22	1967-09-07
1968	1968-04-30	1968-09-14
1969	1969-05-26	1969-09-14
1970	1970-05-18	1970-10-05
1971	1971-06-16	1971-09-07
1972	1972-05-17	1972-09-19
1973	1973-06-09	1973-09-01
1974	1974-05-20	1974-09-26
1975	1975-06-25	1975-09-10
1976	1976-06-05	1976-09-30
1977	1977-05-18	1977-09-08
1978	1978-06-25	1978-09-11
1979	1979-05-28	1979-09-09
1980	1980-04-20	1980-10-09
1981	1981-05-02	1981-09-12
1982	1982-06-28	1982-09-10
1983	1983-06-10	1983-09-27
1984	1984-06-25	1984-09-19
1986	1986-05-31	1986-08-15
1987	1987-04-19	1987-09-26
1988	1988-05-12	1988-09-18
1989	1989-06-06	1989-09-30
1990	1990-04-22	1990-09-26
1991	1991-04-06	1991-09-07
1992	1992-04-30	1992-10-02
1993	1993-07-30	1993-10-06
1994	1994-05-23	1994-09-09
1995	1995-06-14	1995-09-15
1997	1997-06-23	1997-10-02
1998	1998-06-24	1998-09-18
1999	1999-06-04	1999-08-31
2000	2000-05-04	2000-09-30
2001	2001-05-14	2001-09-05
2002	2002-05-30	2002-09-16
2003	2003-04-14	2003-10-07
2004	2004-04-28	2004-09-19
2005	2005-06-06	2005-09-11
2006	2006-05-27	2006-08-23
2007	2007-05-13	2007-10-06
2008	2008-07-01	2008-09-26
2009	2009-04-23	2009-08-14
2010	2010-05-24	2010-08-30
2011	2011-06-06	2011-09-28
2012	2012-05-17	2012-09-11
2013	2013-05-13	2013-09-18
2014	2014-05-30	2014-07-21
2015	2015-06-09	2015-10-11
2016	2016-05-06	2016-08-29
2017	2017-06-02	2017-09-22
2018	2018-05-24	2018-09-16
2019	2019-06-04	2019-09-17
2020	2020-06-01	2020-08-26
2021	2021-05-01	2021-09-28
2022	2022-06-12	2022-09-14
2023	2023-05-30	2023-10-02
2024	2024-04-13	2024-09-29
2025	2025-05-11	2025-10-04
2026	2026-04-22	2026-10-10

Every Fixed Threshold

Fixed thresholds at Watertown Rgnl AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	125	80	1933	32
35 C (95 F): Days	92	34	1933	1
40 C (104 F): Days	10	8	1936	3
90 F (32.2 C): Days	125	53	1933	14
100 F (37.8 C): Days	32	17	1933	1
110 F (43.3 C): Days	1	1	1934	1
0 C (32 F): Ice days (max	125	113	1975	39
0 C (32 F): Frost days (min	125	204	1907	107
-10 C (14 F): Days with min	125	115	1950	41
-20 C (-4 F): Days with min	125	60	1916	14
-30 C (-22 F): Days with min	96	24	1916	1
-40 C (-40 F): Days with min	1	1	1916	1
20 C (68 F): Tropical nights (min	118	21	1936	12
25 C (77 F): Days with min	8	2	1988	1
10 mm (0.39 in): Days with 10 mm or more rain	120	28	1991	11
25 mm (0.98 in): Days with 25 mm or more rain	120	12	1977	3
50 mm (1.97 in): Days with 50 mm or more rain	60	4	1956	2
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1931	1
10 cm (3.9 in): Days with 10 cm or more snowfall	74	7	2007	1
25 cm (9.8 in): Days with 25 cm or more snowfall	14	2	2008	2

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

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Data for Watertown Rgnl AP 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 Rgnl AP Threshold Days by Year (USW00014946)

Key Facts for Watertown Rgnl AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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