Norwalk Wwtp Threshold Days by Year (USC00336118)

19 fixed thresholds counted per year at Norwalk Wwtp (USC00336118): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Norwalk Wwtp Thresholds

Norwalk Wwtp: days with a maximum temperature at or above 30 C (86 F) in 130 years, most in 1934 with 80.
Norwalk Wwtp: days with a maximum temperature at or above 90 F (32.2 C) in 130 years, most in 1934 with 55.
Norwalk Wwtp: days with a maximum temperature at or below 0 C (32 F) in 130 years, most in 1978 with 65.
Norwalk Wwtp: nights with a minimum temperature at or below 0 C (32 F) in 129 years, most in 1895 with 188.
19 fixed thresholds have at least one qualifying day at Norwalk Wwtp.

Days at or above 30 C (86 F)

130 years with a qualifying day

Days per year at Norwalk Wwtp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 1934.

Days at or above 30 C (86 F) per year at Norwalk Wwtp
Year	Days	Decade average
1895	76	58
1896	55	58
1897	47	58
1898	51	58
1899	61	58
1900	65	47.8
1901	57	47.8
1902	33	47.8
1903	41	47.8
1904	31	47.8
1905	40	47.8
1906	73	47.8
1907	36	47.8
1908	63	47.8
1909	39	47.8
1910	48	47.9
1911	63	47.9
1912	43	47.9
1913	66	47.9
1914	58	47.9
1915	21	47.9
1916	49	47.9
1917	30	47.9
1918	44	47.9
1919	57	47.9
1920	31	45.3
1921	64	45.3
1922	55	45.3
1923	47	45.3
1924	33	45.3
1925	55	45.3
1926	30	45.3
1927	37	45.3
1928	53	45.3
1929	48	45.3
1930	73	65.3
1931	71	65.3
1932	65	65.3
1933	71	65.3
1934	80	65.3
1935	51	65.3
1936	74	65.3
1937	44	65.3
1938	59	65.3
1939	65	65.3
1940	48	43.8
1941	60	43.8
1942	42	43.8
1943	48	43.8
1944	50	43.8
1945	37	43.8
1946	28	43.8
1947	36	43.8
1948	36	43.8
1949	53	43.8
1950	28	37.4
1951	36	37.4
1953	50	37.4
1954	39	37.4
1955	52	37.4
1956	30	37.4
1957	32	37.4
1958	16	37.4
1959	54	37.4
1960	25	37.5
1961	37	37.5
1962	41	37.5
1963	43	37.5
1964	40	37.5
1965	45	37.5
1966	50	37.5
1967	26	37.5
1968	32	37.5
1969	36	37.5
1970	56	34.4
1971	39	34.4
1972	22	34.4
1973	34	34.4
1974	28	34.4
1975	35	34.4
1976	27	34.4
1977	39	34.4
1978	39	34.4
1979	25	34.4
1980	36	29.9
1981	20	29.9
1982	28	29.9
1983	50	29.9
1984	31	29.9
1985	20	29.9
1986	22	29.9
1987	33	29.9
1988	46	29.9
1989	13	29.9
1990	20	29.6
1991	51	29.6
1992	8	29.6
1993	37	29.6
1994	26	29.6
1995	31	29.6
1996	22	29.6
1997	18	29.6
1998	37	29.6
1999	46	29.6
2000	14	27.4
2001	30	27.4
2002	50	27.4
2003	13	27.4
2004	13	27.4
2005	45	27.4
2006	26	27.4
2007	39	27.4
2009	17	27.4
2010	50	41.6
2011	42	41.6
2012	58	41.6
2013	30	41.6
2014	26	41.6
2015	34	41.6
2016	53	41.6
2017	34	41.6
2018	50	41.6
2019	39	41.6
2020	43	32.7
2021	44	32.7
2022	27	32.7
2023	18	32.7
2024	35	32.7
2025	38	32.7
2026	24	32.7

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

First to last qualifying date each year at Norwalk Wwtp
Year	First date	Last date
1895	1895-05-03	1895-09-22
1896	1896-04-12	1896-09-11
1897	1897-06-14	1897-10-16
1898	1898-05-19	1898-10-03
1899	1899-04-29	1899-10-14
1900	1900-05-13	1900-10-06
1901	1901-05-23	1901-09-08
1902	1902-05-04	1902-09-01
1903	1903-05-17	1903-09-15
1904	1904-05-22	1904-09-29
1905	1905-05-03	1905-09-29
1906	1906-05-15	1906-09-22
1907	1907-06-17	1907-09-20
1908	1908-05-25	1908-10-18
1909	1909-06-15	1909-09-20
1910	1910-06-16	1910-10-03
1911	1911-05-10	1911-09-24
1912	1912-05-22	1912-09-14
1913	1913-05-02	1913-10-09
1914	1914-04-28	1914-09-22
1915	1915-04-24	1915-09-16
1916	1916-07-02	1916-10-08
1917	1917-05-18	1917-08-27
1918	1918-05-05	1918-08-25
1919	1919-05-30	1919-10-03
1920	1920-06-02	1920-10-21
1921	1921-04-26	1921-09-29
1922	1922-05-30	1922-10-06
1923	1923-06-01	1923-09-27
1924	1924-06-19	1924-09-01
1925	1925-04-23	1925-09-20
1926	1926-05-07	1926-09-22
1927	1927-05-09	1927-10-02
1928	1928-05-04	1928-10-12
1929	1929-05-27	1929-09-28
1930	1930-04-11	1930-09-22
1931	1931-05-18	1931-10-06
1932	1932-05-15	1932-09-19
1933	1933-05-23	1933-09-25
1934	1934-05-04	1934-09-26
1935	1935-06-13	1935-09-25
1936	1936-05-07	1936-09-23
1937	1937-05-26	1937-10-01
1938	1938-04-27	1938-10-18
1939	1939-05-06	1939-10-09
1940	1940-05-14	1940-09-21
1941	1941-04-13	1941-10-06
1942	1942-04-26	1942-09-19
1943	1943-06-03	1943-09-01
1944	1944-05-26	1944-09-04
1945	1945-06-14	1945-09-23
1946	1946-06-11	1946-10-05
1947	1947-06-10	1947-09-20
1948	1948-04-26	1948-09-19
1949	1949-05-04	1949-10-09
1950	1950-05-05	1950-09-10
1951	1951-05-16	1951-10-05
1953	1953-05-25	1953-10-03
1954	1954-05-31	1954-10-02
1955	1955-05-03	1955-09-19
1956	1956-05-13	1956-09-13
1957	1957-04-24	1957-09-02
1958	1958-06-05	1958-09-15
1959	1959-05-02	1959-10-05
1960	1960-04-24	1960-09-09
1961	1961-05-15	1961-09-25
1962	1962-05-14	1962-09-13
1963	1963-05-09	1963-09-19
1964	1964-05-19	1964-09-11
1965	1965-05-08	1965-09-22
1966	1966-05-27	1966-09-03
1967	1967-05-27	1967-08-17
1968	1968-06-07	1968-08-25
1969	1969-05-29	1969-09-07
1970	1970-05-01	1970-09-25
1971	1971-05-19	1971-09-30
1972	1972-06-15	1972-09-18
1973	1973-06-06	1973-09-28
1974	1974-06-10	1974-08-28
1975	1975-05-20	1975-08-26
1976	1976-04-17	1976-09-10
1977	1977-05-14	1977-09-06
1978	1978-05-29	1978-09-22
1979	1979-05-09	1979-09-01
1980	1980-05-06	1980-09-23
1981	1981-06-06	1981-09-02
1982	1982-05-07	1982-09-15
1983	1983-06-12	1983-09-20
1984	1984-06-06	1984-09-23
1985	1985-04-22	1985-09-09
1986	1986-06-02	1986-09-30
1987	1987-05-15	1987-08-18
1988	1988-05-16	1988-08-18
1989	1989-06-25	1989-09-10
1990	1990-04-26	1990-09-07
1991	1991-05-13	1991-09-17
1992	1992-05-18	1992-08-27
1993	1993-05-29	1993-09-15
1994	1994-05-31	1994-09-17
1995	1995-06-19	1995-09-07
1996	1996-05-20	1996-08-27
1997	1997-06-21	1997-08-17
1998	1998-05-15	1998-09-27
1999	1999-05-18	1999-09-29
2000	2000-05-07	2000-09-04
2001	2001-05-04	2001-09-10
2002	2002-06-02	2002-09-20
2003	2003-06-24	2003-08-28
2004	2004-05-10	2004-09-06
2005	2005-06-06	2005-09-23
2006	2006-05-29	2006-08-27
2007	2007-05-16	2007-10-09
2009	2009-04-26	2009-08-21
2010	2010-05-28	2010-10-11
2011	2011-05-13	2011-09-04
2012	2012-05-03	2012-09-07
2013	2013-05-16	2013-09-21
2014	2014-05-09	2014-09-06
2015	2015-05-09	2015-09-09
2016	2016-05-28	2016-09-24
2017	2017-05-17	2017-10-04
2018	2018-05-26	2018-10-10
2019	2019-05-26	2019-10-02
2020	2020-05-25	2020-09-09
2021	2021-05-20	2021-09-28
2022	2022-05-22	2022-09-22
2023	2023-05-31	2023-10-04
2024	2024-05-20	2024-09-23
2025	2025-06-05	2025-10-05
2026	2026-05-19	2026-08-09

Every Fixed Threshold

Fixed thresholds at Norwalk Wwtp
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	130	80	1934	24
35 C (95 F): Days	91	31	1931	3
40 C (104 F): Days	6	5	1930	4
90 F (32.2 C): Days	130	55	1934	8
100 F (37.8 C): Days	25	10	1930	2
0 C (32 F): Ice days (max	130	65	1978	33
0 C (32 F): Frost days (min	129	188	1895	69
-10 C (14 F): Days with min	129	66	1895	29
-20 C (-4 F): Days with min	93	14	2014	2
-30 C (-22 F): Days with min	5	1	1897	1
20 C (68 F): Tropical nights (min	129	40	2021	27
25 C (77 F): Days with min	17	4	2018	3
10 mm (0.39 in): Days with 10 mm or more rain	128	44	1909	23
25 mm (0.98 in): Days with 25 mm or more rain	127	14	1950	7
50 mm (1.97 in): Days with 50 mm or more rain	72	3	1929	1
100 mm (3.94 in): Days with 100 mm or more rain	8	1	1948	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1969	1
10 cm (3.9 in): Days with 10 cm or more snowfall	100	10	1910	1
25 cm (9.8 in): Days with 25 cm or more snowfall	10	2	1910	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1895.

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Data for Norwalk Wwtp 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 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Norwalk Wwtp Threshold Days by Year (USC00336118)

Key Facts for Norwalk Wwtp Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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