Williamstown Threshold Days by Year (USC00158714)

19 fixed thresholds counted per year at Williamstown (USC00158714): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Williamstown Thresholds

Williamstown: nights with a minimum temperature at or below 0 C (32 F) in 100 years, most in 1912 with 133.
Williamstown: nights with a minimum temperature at or below -10 C (14 F) in 100 years, most in 1963 with 49.
Williamstown: nights with a minimum temperature at or above 20 C (68 F) in 100 years, most in 2002 with 56.
Williamstown: days with a maximum temperature at or above 30 C (86 F) in 99 years, most in 1936 with 120.
19 fixed thresholds have at least one qualifying day at Williamstown.

Days at or above 30 C (86 F)

99 years with a qualifying day

Days per year at Williamstown with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 120 in 1936.

Days at or above 30 C (86 F) per year at Williamstown
Year	Days	Decade average
1903	51	42.7
1904	48	42.7
1905	25	42.7
1906	52	42.7
1907	35	42.7
1908	66	42.7
1909	22	42.7
1910	38	63.9
1911	64	63.9
1912	57	63.9
1913	68	63.9
1914	74	63.9
1915	52	63.9
1916	76	63.9
1917	51	63.9
1918	69	63.9
1919	90	63.9
1920	45	57.8
1922	81	57.8
1923	65	57.8
1924	45	57.8
1925	72	57.8
1926	56	57.8
1927	48	57.8
1928	52	57.8
1929	56	57.8
1930	99	95.9
1931	80	95.9
1932	98	95.9
1933	104	95.9
1934	115	95.9
1935	83	95.9
1936	120	95.9
1937	80	95.9
1938	95	95.9
1939	85	95.9
1940	62	68.3
1941	96	68.3
1942	71	68.3
1943	79	68.3
1944	90	68.3
1945	47	68.3
1946	46	68.3
1947	58	68.3
1948	66	68.3
1950	16	57.9
1951	63	57.9
1952	76	57.9
1953	84	57.9
1954	70	57.9
1955	69	57.9
1956	41	57.9
1957	48	57.9
1958	30	57.9
1959	82	57.9
1960	49	48.4
1961	46	48.4
1962	59	48.4
1963	43	48.4
1964	66	48.4
1965	41	48.4
1966	56	48.4
1967	27	48.4
1968	46	48.4
1969	51	48.4
1970	55	38.8
1971	36	38.8
1972	41	38.8
1973	40	38.8
1974	21	38.8
1975	53	38.8
1976	26	38.8
1977	51	38.8
1978	41	38.8
1979	24	38.8
1980	63	54.2
1981	37	54.2
1982	32	54.2
1983	72	54.2
1984	54	54.2
1985	36	54.2
1986	54	54.2
1987	83	54.2
1988	70	54.2
1989	41	54.2
1990	41	59.1
1991	76	59.1
1992	19	59.1
1993	67	59.1
1994	56	59.1
1995	65	59.1
1996	51	59.1
1997	55	59.1
1998	75	59.1
1999	86	59.1
2000	44	57.8
2001	57	57.8
2002	88	57.8
2003	42	57.8

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

First to last qualifying date each year at Williamstown
Year	First date	Last date
1903	1903-05-17	1903-10-04
1904	1904-05-24	1904-09-29
1905	1905-06-06	1905-09-29
1906	1906-04-28	1906-09-13
1907	1907-03-23	1907-09-21
1908	1908-05-26	1908-10-07
1909	1909-06-08	1909-09-20
1910	1910-03-25	1910-10-18
1911	1911-05-16	1911-09-28
1912	1912-05-24	1912-09-15
1913	1913-05-03	1913-09-21
1914	1914-05-25	1914-10-08
1915	1915-04-20	1915-09-20
1916	1916-05-08	1916-10-09
1917	1917-04-19	1917-09-27
1918	1918-05-06	1918-10-05
1919	1919-04-23	1919-10-04
1920	1920-05-23	1920-09-26
1922	1922-05-09	1922-10-06
1923	1923-05-28	1923-09-27
1924	1924-05-06	1924-09-12
1925	1925-04-23	1925-09-26
1926	1926-05-01	1926-09-23
1927	1927-05-09	1927-10-06
1928	1928-05-03	1928-10-13
1929	1929-03-25	1929-09-28
1930	1930-04-11	1930-09-26
1931	1931-05-16	1931-10-04
1932	1932-05-04	1932-09-19
1933	1933-05-01	1933-09-30
1934	1934-04-04	1934-10-09
1935	1935-04-26	1935-10-16
1936	1936-05-06	1936-09-27
1937	1937-05-21	1937-10-06
1938	1938-04-26	1938-10-18
1939	1939-05-06	1939-10-10
1940	1940-05-06	1940-10-27
1941	1941-04-13	1941-10-07
1942	1942-04-29	1942-09-19
1943	1943-05-06	1943-09-07
1944	1944-05-12	1944-09-20
1945	1945-06-01	1945-09-24
1946	1946-04-22	1946-09-27
1947	1947-05-15	1947-10-05
1948	1948-04-25	1948-09-20
1950	1950-05-26	1950-08-28
1951	1951-04-25	1951-10-06
1952	1952-05-05	1952-10-01
1953	1953-05-22	1953-10-21
1954	1954-06-01	1954-10-06
1955	1955-05-21	1955-09-30
1956	1956-05-14	1956-09-14
1957	1957-05-14	1957-09-12
1958	1958-06-05	1958-09-27
1959	1959-05-03	1959-10-06
1960	1960-04-24	1960-09-24
1961	1961-06-12	1961-09-25
1962	1962-05-01	1962-09-14
1963	1963-05-10	1963-09-21
1964	1964-05-20	1964-09-22
1965	1965-05-24	1965-09-20
1966	1966-06-09	1966-09-03
1967	1967-05-25	1967-09-20
1968	1968-06-06	1968-09-23
1969	1969-05-28	1969-09-06
1970	1970-05-21	1970-09-24
1971	1971-06-04	1971-10-02
1972	1972-06-04	1972-09-21
1973	1973-06-03	1973-09-28
1974	1974-05-17	1974-08-26
1975	1975-05-21	1975-09-05
1976	1976-06-08	1976-08-28
1977	1977-04-18	1977-09-05
1978	1978-06-01	1978-09-21
1979	1979-06-09	1979-09-05
1980	1980-05-29	1980-10-10
1981	1981-06-09	1981-09-30
1982	1982-05-12	1982-09-14
1983	1983-06-12	1983-09-19
1984	1984-06-04	1984-09-22
1985	1985-05-13	1985-09-10
1986	1986-04-26	1986-09-30
1987	1987-05-17	1987-09-27
1988	1988-05-15	1988-09-13
1989	1989-05-31	1989-09-10
1990	1990-04-25	1990-09-07
1991	1991-05-14	1991-09-16
1992	1992-06-17	1992-09-15
1993	1993-05-09	1993-09-14
1994	1994-05-23	1994-10-01
1995	1995-06-06	1995-09-14
1996	1996-05-18	1996-09-11
1997	1997-06-19	1997-10-08
1998	1998-05-14	1998-09-29
1999	1999-06-05	1999-09-28
2000	2000-05-24	2000-09-03
2001	2001-04-09	2001-09-13
2002	2002-05-30	2002-09-19
2003	2003-06-10	2003-09-03

Every Fixed Threshold

Fixed thresholds at Williamstown
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	99	120	1936	42
35 C (95 F): Days	68	64	1936	1
40 C (104 F): Days	10	14	1936	1
90 F (32.2 C): Days	99	106	1936	10
100 F (37.8 C): Days	27	30	1936	1
110 F (43.3 C): Days	2	3	1934	3
0 C (32 F): Ice days (max	99	48	1978	22
0 C (32 F): Frost days (min	100	133	1912	98
-10 C (14 F): Days with min	100	49	1963	17
-20 C (-4 F): Days with min	49	12	1963	1
-30 C (-22 F): Days with min	2	1	1989	1
20 C (68 F): Tropical nights (min	100	56	2002	25
25 C (77 F): Days with min	13	3	1952	2
10 mm (0.39 in): Days with 10 mm or more rain	94	53	1950	42
25 mm (0.98 in): Days with 25 mm or more rain	94	19	1990	13
50 mm (1.97 in): Days with 50 mm or more rain	67	6	1933	4
100 mm (3.94 in): Days with 100 mm or more rain	5	2	1997	2
10 cm (3.9 in): Days with 10 cm or more snowfall	32	5	1993	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1994	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1903.

Download the Data

Data for Williamstown 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Williamstown Threshold Days by Year (USC00158714)

Key Facts for Williamstown Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related