Norwich Threshold Days by Year (USC00306085)

18 fixed thresholds counted per year at Norwich (USC00306085): 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 1926 with 48.
Norwich: days with 25 mm (0.98 in) or more of precipitation in 114 years, most in 1977 with 15.
Norwich: days with a maximum temperature at or above 30 C (86 F) in 112 years, most in 1939 with 47.
Norwich: days with a maximum temperature at or below 0 C (32 F) in 112 years, most in 1940 with 72.
18 fixed thresholds have at least one qualifying day at Norwich.

Days at or above 30 C (86 F)

112 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 47 in 1939.

Days at or above 30 C (86 F) per year at Norwich
Year	Days	Decade average
1907	12	16.3
1908	23	16.3
1909	14	16.3
1915	3	15.8
1916	28	15.8
1917	9	15.8
1918	19	15.8
1919	20	15.8
1920	7	8.4
1921	15	8.4
1922	7	8.4
1923	18	8.4
1924	3	8.4
1925	13	8.4
1926	6	8.4
1927	6	8.4
1928	5	8.4
1929	4	8.4
1930	5	26.4
1931	13	26.4
1933	26	26.4
1934	25	26.4
1935	17	26.4
1936	39	26.4
1937	32	26.4
1938	34	26.4
1939	47	26.4
1940	20	23.3
1941	33	23.3
1942	16	23.3
1943	32	23.3
1944	40	23.3
1945	16	23.3
1946	12	23.3
1947	22	23.3
1948	13	23.3
1949	29	23.3
1950	5	16.6
1951	4	16.6
1952	28	16.6
1953	28	16.6
1954	13	16.6
1955	35	16.6
1956	6	16.6
1957	9	16.6
1958	4	16.6
1959	34	16.6
1960	6	15.4
1961	15	15.4
1962	14	15.4
1963	16	15.4
1964	24	15.4
1965	19	15.4
1966	18	15.4
1967	9	15.4
1968	19	15.4
1969	14	15.4
1970	10	17.4
1971	13	17.4
1972	10	17.4
1973	30	17.4
1974	20	17.4
1975	29	17.4
1976	8	17.4
1977	19	17.4
1978	20	17.4
1979	15	17.4
1980	18	18.8
1982	15	18.8
1983	38	18.8
1984	12	18.8
1985	10	18.8
1986	9	18.8
1987	21	18.8
1988	32	18.8
1989	14	18.8
1990	17	17.8
1991	30	17.8
1992	6	17.8
1993	17	17.8
1994	12	17.8
1995	26	17.8
1996	4	17.8
1997	18	17.8
1998	14	17.8
1999	34	17.8
2000	4	21.9
2001	27	21.9
2002	40	21.9
2003	18	21.9
2004	9	21.9
2005	42	21.9
2007	29	21.9
2008	15	21.9
2009	13	21.9
2010	30	21.1
2011	20	21.1
2012	29	21.1
2013	19	21.1
2014	6	21.1
2015	18	21.1
2016	22	21.1
2017	15	21.1
2018	30	21.1
2019	22	21.1
2020	22	11.3
2021	6	11.3
2022	24	11.3
2023	2	11.3
2024	9	11.3
2025	9	11.3
2026	7	11.3

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
1907	1907-06-18	1907-08-18
1908	1908-05-26	1908-09-27
1909	1909-06-21	1909-08-25
1915	1915-04-25	1915-09-15
1916	1916-07-07	1916-09-01
1917	1917-07-22	1917-08-02
1918	1918-06-01	1918-08-24
1919	1919-06-01	1919-09-08
1920	1920-06-01	1920-07-14
1921	1921-06-27	1921-09-02
1922	1922-06-08	1922-08-18
1923	1923-06-05	1923-08-07
1924	1924-07-29	1924-08-31
1925	1925-06-01	1925-08-19
1926	1926-07-08	1926-08-02
1927	1927-06-29	1927-10-02
1928	1928-05-04	1928-08-16
1929	1929-05-30	1929-07-28
1930	1930-06-03	1930-08-08
1931	1931-06-20	1931-09-22
1933	1933-06-07	1933-08-01
1934	1934-05-10	1934-08-19
1935	1935-06-14	1935-08-18
1936	1936-05-11	1936-09-23
1937	1937-05-30	1937-09-03
1938	1938-04-28	1938-08-21
1939	1939-05-08	1939-10-10
1940	1940-05-15	1940-08-17
1941	1941-04-20	1941-10-05
1942	1942-06-11	1942-09-18
1943	1943-06-04	1943-09-07
1944	1944-05-04	1944-09-03
1945	1945-06-15	1945-09-09
1946	1946-05-26	1946-08-10
1947	1947-05-30	1947-09-13
1948	1948-06-25	1948-09-14
1949	1949-05-06	1949-08-29
1950	1950-06-09	1950-08-19
1951	1951-08-15	1951-10-06
1952	1952-06-18	1952-09-15
1953	1953-06-10	1953-10-01
1954	1954-06-02	1954-09-08
1955	1955-05-05	1955-09-20
1956	1956-06-13	1956-08-18
1957	1957-06-16	1957-08-04
1958	1958-07-02	1958-09-01
1959	1959-05-21	1959-09-24
1960	1960-06-18	1960-09-09
1961	1961-06-13	1961-09-25
1962	1962-04-28	1962-09-01
1963	1963-06-26	1963-10-08
1964	1964-05-24	1964-09-24
1965	1965-05-04	1965-09-23
1966	1966-06-24	1966-08-31
1967	1967-06-10	1967-07-24
1968	1968-06-07	1968-08-26
1969	1969-05-30	1969-09-15
1970	1970-06-02	1970-09-25
1971	1971-05-20	1971-09-07
1972	1972-07-13	1972-08-26
1973	1973-06-06	1973-09-06
1974	1974-06-10	1974-08-24
1975	1975-05-21	1975-08-27
1976	1976-04-19	1976-08-26
1977	1977-05-18	1977-09-02
1978	1978-05-27	1978-09-07
1979	1979-05-09	1979-09-02
1980	1980-05-24	1980-09-03
1982	1982-05-07	1982-09-14
1983	1983-06-12	1983-09-20
1984	1984-05-22	1984-08-09
1985	1985-07-05	1985-09-07
1986	1986-05-18	1986-07-25
1987	1987-05-29	1987-08-17
1988	1988-05-30	1988-08-15
1989	1989-05-19	1989-09-10
1990	1990-04-26	1990-08-18
1991	1991-04-07	1991-09-16
1992	1992-05-22	1992-08-27
1993	1993-05-10	1993-08-31
1994	1994-04-26	1994-07-22
1995	1995-06-18	1995-08-31
1996	1996-05-19	1996-08-07
1997	1997-06-10	1997-08-16
1998	1998-03-31	1998-09-27
1999	1999-05-30	1999-09-06
2000	2000-05-07	2000-08-31
2001	2001-05-02	2001-09-09
2002	2002-04-17	2002-09-11
2003	2003-06-24	2003-08-28
2004	2004-05-14	2004-08-30
2005	2005-06-06	2005-09-13
2007	2007-05-16	2007-09-27
2008	2008-06-07	2008-09-14
2009	2009-04-26	2009-08-19
2010	2010-05-02	2010-09-25
2011	2011-05-27	2011-09-05
2012	2012-05-21	2012-09-02
2013	2013-05-22	2013-09-12
2014	2014-05-28	2014-07-28
2015	2015-05-09	2015-09-10
2016	2016-05-26	2016-09-09
2017	2017-05-18	2017-09-27
2018	2018-05-03	2018-09-17
2019	2019-05-20	2019-09-12
2020	2020-05-27	2020-08-25
2021	2021-05-21	2021-07-21
2022	2022-05-13	2022-08-26
2023	2023-06-03	2023-07-29
2024	2024-06-19	2024-08-02
2025	2025-06-24	2025-08-17
2026	2026-05-18	2026-08-07

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	112	47	1939	7
35 C (95 F): Days	27	7	1939	1
90 F (32.2 C): Days	91	25	1939	4
100 F (37.8 C): Days	2	2	1936	1
0 C (32 F): Ice days (max	112	72	1940	47
0 C (32 F): Frost days (min	111	192	1978	102
-10 C (14 F): Days with min	111	85	1970	41
-20 C (-4 F): Days with min	107	33	2015	13
-30 C (-22 F): Days with min	25	5	1968	2
20 C (68 F): Tropical nights (min	80	13	1931	1
25 C (77 F): Days with min	1	1	1921	1
10 mm (0.39 in): Days with 10 mm or more rain	114	48	1926	24
25 mm (0.98 in): Days with 25 mm or more rain	114	15	1977	7
50 mm (1.97 in): Days with 50 mm or more rain	56	5	1935	1
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1935	1
10 cm (3.9 in): Days with 10 cm or more snowfall	88	9	1956	1
25 cm (9.8 in): Days with 25 cm or more snowfall	31	2	1926	1
50 cm (19.7 in): Days with 50 cm or more snowfall	4	1	1937	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1907.

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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Norwich Threshold Days by Year (USC00306085)

Key Facts for Norwich Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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