Watertown AP Threshold Days by Year (USW00094790)

18 fixed thresholds counted per year at Watertown AP (USW00094790): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Watertown AP Thresholds

Watertown AP: days with a maximum temperature at or below 0 C (32 F) in 76 years, most in 1969 with 84.
Watertown AP: nights with a minimum temperature at or below 0 C (32 F) in 76 years, most in 1972 with 182.
Watertown AP: nights with a minimum temperature at or below -10 C (14 F) in 76 years, most in 1978 with 79.
Watertown AP: nights with a minimum temperature at or below -20 C (-4 F) in 76 years, most in 1963 with 32.
18 fixed thresholds have at least one qualifying day at Watertown AP.

Days at or above 30 C (86 F)

75 years with a qualifying day

Days per year at Watertown AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 29 in 1955.

Days at or above 30 C (86 F) per year at Watertown AP
Year	Days	Decade average
1950	6	11.8
1951	2	11.8
1952	20	11.8
1953	19	11.8
1954	3	11.8
1955	29	11.8
1956	5	11.8
1957	9	11.8
1958	2	11.8
1959	23	11.8
1960	5	12.4
1961	10	12.4
1962	5	12.4
1963	11	12.4
1964	27	12.4
1965	11	12.4
1966	19	12.4
1967	15	12.4
1968	7	12.4
1969	14	12.4
1970	16	12.8
1971	13	12.8
1972	3	12.8
1973	29	12.8
1974	6	12.8
1975	14	12.8
1976	7	12.8
1977	14	12.8
1978	17	12.8
1979	9	12.8
1980	9	7.1
1981	1	7.1
1982	3	7.1
1984	1	7.1
1985	8	7.1
1986	2	7.1
1987	14	7.1
1988	22	7.1
1989	4	7.1
1990	10	10.4
1991	11	10.4
1992	1	10.4
1993	14	10.4
1994	11	10.4
1995	19	10.4
1996	8	10.4
1997	7	10.4
1998	7	10.4
1999	16	10.4
2001	21	11.8
2002	17	11.8
2003	8	11.8
2004	1	11.8
2005	21	11.8
2006	8	11.8
2007	15	11.8
2008	7	11.8
2009	8	11.8
2010	15	13.5
2011	10	13.5
2012	23	13.5
2013	13	13.5
2014	8	13.5
2015	9	13.5
2016	23	13.5
2017	3	13.5
2018	21	13.5
2019	10	13.5
2020	24	14
2021	12	14
2022	15	14
2023	5	14
2024	11	14
2025	25	14
2026	6	14

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

First to last qualifying date each year at Watertown AP
Year	First date	Last date
1950	1950-06-23	1950-08-27
1951	1951-07-09	1951-09-13
1952	1952-06-14	1952-09-02
1953	1953-06-17	1953-09-04
1954	1954-06-09	1954-07-29
1955	1955-05-22	1955-09-18
1956	1956-06-14	1956-08-09
1957	1957-06-18	1957-08-25
1958	1958-08-12	1958-08-31
1959	1959-06-11	1959-09-29
1960	1960-05-27	1960-09-09
1961	1961-05-15	1961-09-14
1962	1962-05-20	1962-08-31
1963	1963-06-28	1963-07-28
1964	1964-05-24	1964-09-23
1965	1965-06-06	1965-09-22
1966	1966-05-24	1966-08-09
1967	1967-05-01	1967-08-17
1968	1968-04-14	1968-09-24
1969	1969-06-12	1969-09-04
1970	1970-04-30	1970-09-24
1971	1971-06-20	1971-09-08
1972	1972-06-15	1972-09-01
1973	1973-06-05	1973-09-05
1974	1974-06-10	1974-08-22
1975	1975-06-23	1975-08-25
1976	1976-06-14	1976-08-28
1977	1977-06-28	1977-09-01
1978	1978-06-12	1978-08-19
1979	1979-07-14	1979-08-02
1980	1980-06-26	1980-08-30
1981	1981-07-02	1981-07-02
1982	1982-07-07	1982-07-18
1984	1984-06-08	1984-06-08
1985	1985-07-05	1985-08-18
1986	1986-07-24	1986-07-25
1987	1987-05-30	1987-08-17
1988	1988-06-14	1988-08-14
1989	1989-07-24	1989-07-27
1990	1990-04-28	1990-08-04
1991	1991-06-18	1991-09-16
1992	1992-08-28	1992-08-28
1993	1993-06-25	1993-09-14
1994	1994-06-15	1994-08-20
1995	1995-06-22	1995-08-19
1996	1996-05-19	1996-09-06
1997	1997-06-25	1997-08-16
1998	1998-05-16	1998-08-09
1999	1999-05-31	1999-09-06
2001	2001-06-14	2001-09-09
2002	2002-07-01	2002-09-14
2003	2003-06-26	2003-09-14
2004	2004-07-22	2004-07-22
2005	2005-06-06	2005-08-10
2006	2006-06-18	2006-08-18
2007	2007-06-03	2007-09-25
2008	2008-04-19	2008-09-14
2009	2009-06-24	2009-08-20
2010	2010-04-03	2010-09-24
2011	2011-05-31	2011-08-06
2012	2012-04-16	2012-08-26
2013	2013-05-31	2013-09-11
2014	2014-05-15	2014-09-05
2015	2015-05-09	2015-09-07
2016	2016-05-28	2016-09-07
2017	2017-04-27	2017-06-18
2018	2018-05-30	2018-09-05
2019	2019-07-04	2019-08-18
2020	2020-05-26	2020-08-15
2021	2021-06-06	2021-08-25
2022	2022-06-16	2022-08-29
2023	2023-06-02	2023-08-07
2024	2024-05-21	2024-08-27
2025	2025-06-04	2025-08-23
2026	2026-05-18	2026-08-05

Every Fixed Threshold

Fixed thresholds at Watertown AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	75	29	1955	6
35 C (95 F): Days	7	2	1953	1
90 F (32.2 C): Days	53	15	1955	1
0 C (32 F): Ice days (max	76	84	1969	41
0 C (32 F): Frost days (min	76	182	1972	98
-10 C (14 F): Days with min	76	79	1978	42
-20 C (-4 F): Days with min	76	32	1963	19
-30 C (-22 F): Days with min	50	11	2003	7
-40 C (-40 F): Days with min	1	1	1994	1
20 C (68 F): Tropical nights (min	74	21	1955	7
25 C (77 F): Days with min	4	1	1988	1
10 mm (0.39 in): Days with 10 mm or more rain	76	44	2008	29
25 mm (0.98 in): Days with 25 mm or more rain	74	14	2017	6
50 mm (1.97 in): Days with 50 mm or more rain	36	5	2017	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1981	1
10 cm (3.9 in): Days with 10 cm or more snowfall	50	15	1985	11
25 cm (9.8 in): Days with 25 cm or more snowfall	25	4	1977	2
50 cm (19.7 in): Days with 50 cm or more snowfall	4	1	1962	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1950.

Download the Data

Data for Watertown 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 AP Threshold Days by Year (USW00094790)

Key Facts for Watertown AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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