Williams Bay Threshold Days by Year (USC00479226)

19 fixed thresholds counted per year at Williams Bay (USC00479226): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Williams Bay Thresholds

Williams Bay: days with a maximum temperature at or above 30 C (86 F) in 33 years, most in 1934 with 58.
Williams Bay: days with a maximum temperature at or below 0 C (32 F) in 33 years, most in 1940 with 88.
Williams Bay: nights with a minimum temperature at or below 0 C (32 F) in 33 years, most in 1926 with 172.
Williams Bay: nights with a minimum temperature at or below -10 C (14 F) in 33 years, most in 1950 with 72.
19 fixed thresholds have at least one qualifying day at Williams Bay.

Days at or above 30 C (86 F)

33 years with a qualifying day

Days per year at Williams Bay with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 58 in 1934.

Days at or above 30 C (86 F) per year at Williams Bay
Year	Days	Decade average
1925	37	24.8
1926	14	24.8
1927	28	24.8
1928	19	24.8
1929	26	24.8
1930	41	39.9
1931	48	39.9
1932	34	39.9
1933	49	39.9
1934	58	39.9
1935	35	39.9
1936	48	39.9
1937	37	39.9
1938	21	39.9
1939	28	39.9
1940	19	31.3
1941	39	31.3
1942	24	31.3
1943	37	31.3
1944	39	31.3
1945	18	31.3
1946	21	31.3
1947	40	31.3
1948	40	31.3
1949	36	31.3
1950	7	23.4
1951	4	23.4
1952	31	23.4
1953	37	23.4
1954	25	23.4
1955	43	23.4
1956	19	23.4
1957	21	23.4

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

First to last qualifying date each year at Williams Bay
Year	First date	Last date
1925	1925-05-22	1925-09-19
1926	1926-07-05	1926-09-18
1927	1927-06-19	1927-09-17
1928	1928-05-03	1928-10-10
1929	1929-05-28	1929-09-03
1930	1930-04-10	1930-09-23
1931	1931-06-18	1931-09-21
1932	1932-05-14	1932-09-19
1933	1933-06-05	1933-09-25
1934	1934-05-06	1934-08-18
1935	1935-07-01	1935-09-24
1936	1936-06-14	1936-09-15
1937	1937-05-30	1937-09-23
1938	1938-06-22	1938-08-20
1939	1939-05-26	1939-09-28
1940	1940-06-06	1940-09-20
1941	1941-05-20	1941-09-23
1942	1942-04-30	1942-08-31
1943	1943-06-12	1943-08-31
1944	1944-05-26	1944-09-03
1945	1945-06-23	1945-09-07
1946	1946-06-16	1946-09-06
1947	1947-06-28	1947-09-20
1948	1948-06-02	1948-09-19
1949	1949-05-04	1949-08-27
1950	1950-05-24	1950-08-16
1951	1951-06-01	1951-07-27
1952	1952-05-04	1952-09-28
1953	1953-05-29	1953-10-21
1954	1954-06-11	1954-09-27
1955	1955-06-30	1955-09-18
1956	1956-05-22	1956-08-27
1957	1957-06-16	1957-09-01

Every Fixed Threshold

Fixed thresholds at Williams Bay
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	33	58	1934	21
35 C (95 F): Days	20	20	1934	4
40 C (104 F): Days	2	7	1934	7
90 F (32.2 C): Days	30	44	1934	7
100 F (37.8 C): Days	7	10	1934	1
110 F (43.3 C): Days	1	1	1936	1
0 C (32 F): Ice days (max	33	88	1940	38
0 C (32 F): Frost days (min	33	172	1926	131
-10 C (14 F): Days with min	33	72	1950	32
-20 C (-4 F): Days with min	32	28	1929	11
-30 C (-22 F): Days with min	6	4	1936	1
20 C (68 F): Tropical nights (min	33	30	1955	17
25 C (77 F): Days with min	6	4	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	31	42	1951	26
25 mm (0.98 in): Days with 25 mm or more rain	31	12	1940	5
50 mm (1.97 in): Days with 50 mm or more rain	18	4	1950	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1929	1
10 cm (3.9 in): Days with 10 cm or more snowfall	19	5	1936	2
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1925	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1925.

Download the Data

Data for Williams Bay 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).

Williams Bay Threshold Days by Year (USC00479226)

Key Facts for Williams Bay Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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