Norwich Threshold Days by Year (USC00436020)

16 fixed thresholds counted per year at Norwich (USC00436020): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Norwich Thresholds

Norwich: days with a maximum temperature at or above 30 C (86 F) in 27 years, most in 1898 with 25.
Norwich: days with a maximum temperature at or below 0 C (32 F) in 27 years, most in 1904 with 89.
Norwich: nights with a minimum temperature at or below 0 C (32 F) in 27 years, most in 1911 with 192.
Norwich: nights with a minimum temperature at or below -10 C (14 F) in 27 years, most in 1904 with 106.
16 fixed thresholds have at least one qualifying day at Norwich.

Days at or above 30 C (86 F)

27 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 25 in 1898.

Days at or above 30 C (86 F) per year at Norwich
Year	Days	Decade average
1896	24	20.5
1897	13	20.5
1898	25	20.5
1899	20	20.5
1900	21	14.5
1901	24	14.5
1902	6	14.5
1903	11	14.5
1904	9	14.5
1905	13	14.5
1906	18	14.5
1907	12	14.5
1908	19	14.5
1909	12	14.5
1910	10	15.7
1911	21	15.7
1912	13	15.7
1913	21	15.7
1914	17	15.7
1915	7	15.7
1916	18	15.7
1917	14	15.7
1918	19	15.7
1919	17	15.7
1920	9	13.3
1921	24	13.3
1924	7	13.3

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
1896	1896-05-09	1896-09-12
1897	1897-06-24	1897-09-10
1898	1898-06-05	1898-09-04
1899	1899-05-01	1899-08-21
1900	1900-05-14	1900-09-03
1901	1901-05-22	1901-09-07
1902	1902-05-22	1902-09-01
1903	1903-04-30	1903-09-15
1904	1904-06-20	1904-08-01
1905	1905-06-10	1905-08-10
1906	1906-05-18	1906-09-19
1907	1907-06-18	1907-08-26
1908	1908-06-07	1908-08-13
1909	1909-06-20	1909-08-25
1910	1910-06-19	1910-07-25
1911	1911-05-11	1911-08-10
1912	1912-06-02	1912-07-15
1913	1913-04-25	1913-09-03
1914	1914-05-26	1914-09-23
1915	1915-07-13	1915-09-16
1916	1916-07-07	1916-08-23
1917	1917-06-20	1917-08-13
1918	1918-05-18	1918-08-24
1919	1919-05-29	1919-09-08
1920	1920-06-01	1920-08-28
1921	1921-05-21	1921-09-09
1924	1924-07-06	1924-09-01

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	27	25	1898	7
35 C (95 F): Days	11	7	1911	1
90 F (32.2 C): Days	24	14	1911	8
100 F (37.8 C): Days	1	2	1911	2
0 C (32 F): Ice days (max	27	89	1904	64
0 C (32 F): Frost days (min	27	192	1911	189
-10 C (14 F): Days with min	27	106	1904	73
-20 C (-4 F): Days with min	27	40	1917	30
-30 C (-22 F): Days with min	21	8	1914	2
20 C (68 F): Tropical nights (min	19	8	1897	3
10 mm (0.39 in): Days with 10 mm or more rain	22	44	1912	34
25 mm (0.98 in): Days with 25 mm or more rain	22	13	1920	8
50 mm (1.97 in): Days with 50 mm or more rain	14	3	1905	2
10 cm (3.9 in): Days with 10 cm or more snowfall	22	11	1904	8
25 cm (9.8 in): Days with 25 cm or more snowfall	12	3	1920	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1914	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1896.

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 (USC00436020)

Key Facts for Norwich Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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