Norwalk Threshold Days by Year (USC00065892)

19 fixed thresholds counted per year at Norwalk (USC00065892): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Norwalk Thresholds

Norwalk: days with a maximum temperature at or above 30 C (86 F) in 63 years, most in 1900 with 57.
Norwalk: days with a maximum temperature at or above 90 F (32.2 C) in 63 years, most in 1944 with 35.
Norwalk: days with a maximum temperature at or below 0 C (32 F) in 63 years, most in 1904 with 55.
Norwalk: nights with a minimum temperature at or below 0 C (32 F) in 63 years, most in 1904 with 176.
19 fixed thresholds have at least one qualifying day at Norwalk.

Days at or above 30 C (86 F)

63 years with a qualifying day

Days per year at Norwalk with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 57 in 1900.

Days at or above 30 C (86 F) per year at Norwalk
Year	Days	Decade average
1893	21	22.1
1894	32	22.1
1895	15	22.1
1896	27	22.1
1897	11	22.1
1898	28	22.1
1899	21	22.1
1900	57	32.3
1901	49	32.3
1902	25	32.3
1903	23	32.3
1904	22	32.3
1905	32	32.3
1906	28	32.3
1907	25	32.3
1908	35	32.3
1909	27	32.3
1910	30	27.4
1911	30	27.4
1912	25	27.4
1913	38	27.4
1914	27	27.4
1915	25	27.4
1916	19	27.4
1917	25	27.4
1918	29	27.4
1919	26	27.4
1920	14	25.6
1921	27	25.6
1922	21	25.6
1923	32	25.6
1924	32	25.6
1925	24	25.6
1926	23	25.6
1927	16	25.6
1928	27	25.6
1929	40	25.6
1930	52	44.9
1931	40	44.9
1932	56	44.9
1933	41	44.9
1934	41	44.9
1935	43	44.9
1936	36	44.9
1937	48	44.9
1938	46	44.9
1939	46	44.9
1940	22	36.3
1941	35	36.3
1942	26	36.3
1943	47	36.3
1944	54	36.3
1945	35	36.3
1946	28	36.3
1947	41	36.3
1948	35	36.3
1949	40	36.3
1950	23	33.8
1951	28	33.8
1952	40	33.8
1953	43	33.8
1954	26	33.8
1955	43	33.8

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

First to last qualifying date each year at Norwalk
Year	First date	Last date
1893	1893-05-21	1893-08-26
1894	1894-05-02	1894-09-10
1895	1895-05-10	1895-09-23
1896	1896-04-17	1896-08-13
1897	1897-06-25	1897-10-16
1898	1898-05-20	1898-09-05
1899	1899-05-28	1899-08-21
1900	1900-05-14	1900-09-12
1901	1901-06-05	1901-09-07
1902	1902-05-23	1902-09-02
1903	1903-04-29	1903-09-14
1904	1904-05-24	1904-08-08
1905	1905-05-07	1905-08-24
1906	1906-05-13	1906-09-19
1907	1907-06-16	1907-09-24
1908	1908-05-13	1908-08-14
1909	1909-05-15	1909-08-29
1910	1910-05-29	1910-08-25
1911	1911-05-22	1911-08-23
1912	1912-05-21	1912-09-11
1913	1913-05-02	1913-09-04
1914	1914-05-20	1914-09-23
1915	1915-04-25	1915-09-17
1916	1916-07-01	1916-09-08
1917	1917-06-22	1917-08-29
1918	1918-05-06	1918-08-23
1919	1919-05-05	1919-10-03
1920	1920-06-03	1920-08-17
1921	1921-05-21	1921-09-03
1922	1922-05-29	1922-09-06
1923	1923-05-26	1923-08-15
1924	1924-06-18	1924-09-02
1925	1925-05-23	1925-08-31
1926	1926-06-30	1926-09-25
1927	1927-04-20	1927-10-02
1928	1928-06-14	1928-10-12
1929	1929-04-07	1929-09-10
1930	1930-05-05	1930-09-25
1931	1931-05-28	1931-09-23
1932	1932-05-26	1932-09-05
1933	1933-05-20	1933-09-09
1934	1934-05-05	1934-08-24
1935	1935-05-27	1935-08-22
1936	1936-05-08	1936-09-12
1937	1937-05-30	1937-09-04
1938	1938-04-28	1938-10-17
1939	1939-05-07	1939-10-10
1940	1940-06-03	1940-09-21
1941	1941-04-15	1941-10-06
1942	1942-04-30	1942-09-17
1943	1943-05-07	1943-09-16
1944	1944-05-05	1944-10-07
1945	1945-03-29	1945-09-29
1946	1946-05-30	1946-09-20
1947	1947-05-13	1947-10-23
1948	1948-05-12	1948-09-18
1949	1949-05-05	1949-10-10
1950	1950-06-06	1950-10-01
1951	1951-05-15	1951-09-12
1952	1952-06-06	1952-09-13
1953	1953-05-11	1953-09-05
1954	1954-06-13	1954-10-01
1955	1955-05-05	1955-08-22

Every Fixed Threshold

Fixed thresholds at Norwalk
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	63	57	1900	43
35 C (95 F): Days	46	11	1949	7
40 C (104 F): Days	1	1	1948	1
90 F (32.2 C): Days	63	35	1944	19
100 F (37.8 C): Days	10	3	1911	1
0 C (32 F): Ice days (max	63	55	1904	20
0 C (32 F): Frost days (min	63	176	1904	122
-10 C (14 F): Days with min	63	65	1904	26
-20 C (-4 F): Days with min	46	15	1948	2
-30 C (-22 F): Days with min	2	1	1904	1
20 C (68 F): Tropical nights (min	63	20	1937	18
10 mm (0.39 in): Days with 10 mm or more rain	51	47	1948	44
25 mm (0.98 in): Days with 25 mm or more rain	51	22	1898	14
50 mm (1.97 in): Days with 50 mm or more rain	48	7	1903	6
100 mm (3.94 in): Days with 100 mm or more rain	16	2	1953	2
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1955	1
10 cm (3.9 in): Days with 10 cm or more snowfall	23	7	1948	4
25 cm (9.8 in): Days with 25 cm or more snowfall	7	2	1934	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1934	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Norwalk 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).

Norwalk Threshold Days by Year (USC00065892)

Key Facts for Norwalk Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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