Norwich Threshold Days by Year (USC00145870)

19 fixed thresholds counted per year at Norwich (USC00145870): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Norwich Thresholds

Norwich: days with 10 mm (0.39 in) or more of precipitation in 114 years, most in 1915 with 38.
Norwich: days with 25 mm (0.98 in) or more of precipitation in 114 years, most in 1973 with 14.
Norwich: days with a maximum temperature at or above 30 C (86 F) in 109 years, most in 1956 with 142.
Norwich: days with a maximum temperature at or above 35 C (95 F) in 109 years, most in 1936 with 85.
19 fixed thresholds have at least one qualifying day at Norwich.

Days at or above 30 C (86 F)

109 years with a qualifying day

Days per year at Norwich with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 142 in 1956.

Days at or above 30 C (86 F) per year at Norwich
Year	Days	Decade average
1900	100	92.5
1901	106	92.5
1902	89	92.5
1903	78	92.5
1904	82	92.5
1905	96	92.5
1906	74	92.5
1907	100	92.5
1908	83	92.5
1909	117	92.5
1910	122	104.9
1911	128	104.9
1912	96	104.9
1913	110	104.9
1914	104	104.9
1915	58	104.9
1916	113	104.9
1917	99	104.9
1918	111	104.9
1919	108	104.9
1920	97	101.4
1921	113	101.4
1922	106	101.4
1923	89	101.4
1924	87	101.4
1925	116	101.4
1926	105	101.4
1927	98	101.4
1928	109	101.4
1929	94	101.4
1930	100	115.4
1931	118	115.4
1932	107	115.4
1933	124	115.4
1934	118	115.4
1935	100	115.4
1936	119	115.4
1937	113	115.4
1938	125	115.4
1939	130	115.4
1940	121	106.1
1941	108	106.1
1942	108	106.1
1943	106	106.1
1944	99	106.1
1945	96	106.1
1946	99	106.1
1947	112	106.1
1948	128	106.1
1949	84	106.1
1950	72	100.7
1955	113	100.7
1956	142	100.7
1957	83	100.7
1958	95	100.7
1959	99	100.7
1960	81	88.4
1961	73	88.4
1962	96	88.4
1964	96	88.4
1965	93	88.4
1966	96	88.4
1967	78	88.4
1968	91	88.4
1969	92	88.4
1970	112	99.7
1971	103	99.7
1972	111	99.7
1973	90	99.7
1974	83	99.7
1975	98	99.7
1976	84	99.7
1978	107	99.7
1979	109	99.7
1980	113	92.9
1981	94	92.9
1982	87	92.9
1983	92	92.9
1984	109	92.9
1985	83	92.9
1986	90	92.9
1987	82	92.9
1988	97	92.9
1989	82	92.9
1990	108	96.9
1991	118	96.9
1992	76	96.9
1993	90	96.9
1994	112	96.9
1995	93	96.9
1996	96	96.9
1997	87	96.9
1998	106	96.9
1999	83	96.9
2002	83	81.7
2003	86	81.7
2004	76	81.7
2005	102	81.7
2007	94	81.7
2008	63	81.7
2009	68	81.7
2010	99	99.6
2011	109	99.6
2012	116	99.6
2013	80	99.6
2014	94	99.6
2016	95	99.6
2017	91	99.6
2018	113	99.6

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

First to last qualifying date each year at Norwich
Year	First date	Last date
1900	1900-03-11	1900-10-05
1901	1901-04-25	1901-10-01
1902	1902-04-20	1902-10-25
1903	1903-04-01	1903-10-06
1904	1904-05-23	1904-10-05
1905	1905-04-08	1905-09-28
1906	1906-04-23	1906-10-07
1907	1907-03-19	1907-10-02
1908	1908-04-06	1908-09-22
1909	1909-04-04	1909-11-03
1910	1910-03-21	1910-10-26
1911	1911-04-29	1911-10-14
1912	1912-05-20	1912-10-05
1913	1913-04-02	1913-10-06
1914	1914-05-11	1914-10-01
1915	1915-05-13	1915-09-19
1916	1916-03-12	1916-10-08
1917	1917-03-30	1917-10-15
1918	1918-02-23	1918-10-15
1919	1919-06-07	1919-10-24
1920	1920-04-17	1920-10-12
1921	1921-05-20	1921-10-17
1922	1922-06-10	1922-10-27
1923	1923-05-31	1923-09-28
1924	1924-04-15	1924-10-04
1925	1925-04-18	1925-10-03
1926	1926-04-16	1926-10-17
1927	1927-04-10	1927-10-27
1928	1928-04-01	1928-10-10
1929	1929-03-24	1929-10-16
1930	1930-04-09	1930-10-10
1931	1931-05-15	1931-10-11
1932	1932-04-13	1932-10-18
1933	1933-04-08	1933-10-05
1934	1934-03-20	1934-10-12
1935	1935-03-14	1935-10-16
1936	1936-04-12	1936-09-23
1937	1937-04-16	1937-10-29
1938	1938-03-21	1938-10-21
1939	1939-04-23	1939-10-26
1940	1940-03-31	1940-10-25
1941	1941-05-13	1941-10-14
1942	1942-04-04	1942-10-02
1943	1943-04-03	1943-10-19
1944	1944-05-15	1944-09-27
1945	1945-05-19	1945-09-22
1946	1946-03-31	1946-09-27
1947	1947-05-14	1947-10-21
1948	1948-04-15	1948-10-13
1949	1949-05-31	1949-10-09
1950	1950-03-25	1950-10-30
1955	1955-03-10	1955-10-20
1956	1956-03-25	1956-10-12
1957	1957-06-05	1957-10-05
1958	1958-05-21	1958-10-19
1959	1959-04-30	1959-09-22
1960	1960-05-19	1960-10-10
1961	1961-04-19	1961-09-11
1962	1962-05-06	1962-10-14
1964	1964-05-03	1964-09-19
1965	1965-04-20	1965-10-10
1966	1966-03-31	1966-10-13
1967	1967-03-11	1967-10-06
1968	1968-04-30	1968-10-30
1969	1969-05-21	1969-10-03
1970	1970-04-27	1970-09-21
1971	1971-04-08	1971-10-12
1972	1972-04-06	1972-10-10
1973	1973-05-18	1973-10-08
1974	1974-03-31	1974-09-12
1975	1975-05-18	1975-10-21
1976	1976-03-25	1976-10-11
1978	1978-05-11	1978-10-21
1979	1979-05-26	1979-10-21
1980	1980-04-21	1980-10-14
1981	1981-04-11	1981-10-04
1982	1982-04-12	1982-10-05
1983	1983-05-06	1983-10-05
1984	1984-05-13	1984-09-24
1985	1985-05-24	1985-09-18
1986	1986-04-24	1986-09-29
1987	1987-04-18	1987-09-26
1988	1988-05-12	1988-09-27
1989	1989-03-10	1989-10-14
1990	1990-05-15	1990-10-16
1991	1991-04-16	1991-10-23
1992	1992-04-10	1992-10-13
1993	1993-05-27	1993-10-07
1994	1994-03-17	1994-10-06
1995	1995-06-02	1995-10-22
1996	1996-02-22	1996-10-16
1997	1997-03-21	1997-10-08
1998	1998-05-18	1998-10-28
1999	1999-05-15	1999-10-22
2002	2002-04-18	2002-10-02
2003	2003-05-04	2003-10-23
2004	2004-04-16	2004-09-26
2005	2005-05-08	2005-10-18
2007	2007-05-13	2007-10-14
2008	2008-05-18	2008-09-28
2009	2009-03-05	2009-09-27
2010	2010-03-31	2010-10-16
2011	2011-04-03	2011-10-04
2012	2012-04-02	2012-10-24
2013	2013-04-30	2013-10-05
2014	2014-04-13	2014-10-27
2016	2016-04-06	2016-10-18
2017	2017-03-20	2017-10-15
2018	2018-04-13	2018-10-06

Every Fixed Threshold

Fixed thresholds at Norwich
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	109	142	1956	113
35 C (95 F): Days	109	85	1936	32
40 C (104 F): Days	86	41	1936	2
45 C (113 F): Days	3	6	1936	1
90 F (32.2 C): Days	109	115	1956	76
100 F (37.8 C): Days	105	60	1936	11
110 F (43.3 C): Days	19	13	1936	1
0 C (32 F): Ice days (max	109	44	1978	18
0 C (32 F): Frost days (min	100	128	2013	110
-10 C (14 F): Days with min	100	39	1978	20
-20 C (-4 F): Days with min	44	9	1905	1
20 C (68 F): Tropical nights (min	100	80	1936	56
25 C (77 F): Days with min	55	24	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	114	38	1915	16
25 mm (0.98 in): Days with 25 mm or more rain	114	14	1973	8
50 mm (1.97 in): Days with 50 mm or more rain	94	5	1918	3
100 mm (3.94 in): Days with 100 mm or more rain	23	2	1923	1
10 cm (3.9 in): Days with 10 cm or more snowfall	44	3	1912	3
25 cm (9.8 in): Days with 25 cm or more snowfall	4	1	1959	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1900.

Download the Data

Data for Norwich 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).

Norwich Threshold Days by Year (USC00145870)

Key Facts for Norwich Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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