Lake Mills Wwtp Threshold Days by Year (USC00474482)

19 fixed thresholds counted per year at Lake Mills Wwtp (USC00474482): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Lake Mills Wwtp Thresholds

Lake Mills Wwtp: days with a maximum temperature at or above 30 C (86 F) in 120 years, most in 1988 with 72.
Lake Mills Wwtp: days with a maximum temperature at or below 0 C (32 F) in 120 years, most in 2014 with 89.
Lake Mills Wwtp: days with a maximum temperature at or above 90 F (32.2 C) in 118 years, most in 1988 with 53.
Lake Mills Wwtp: nights with a minimum temperature at or below 0 C (32 F) in 115 years, most in 1925 with 183.
19 fixed thresholds have at least one qualifying day at Lake Mills Wwtp.

Days at or above 30 C (86 F)

120 years with a qualifying day

Days per year at Lake Mills Wwtp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 72 in 1988.

Days at or above 30 C (86 F) per year at Lake Mills Wwtp
Year	Days	Decade average
1893	36	39.7
1894	51	39.7
1895	50	39.7
1897	38	39.7
1898	31	39.7
1899	32	39.7
1900	53	33.4
1901	59	33.4
1904	16	33.4
1905	23	33.4
1906	34	33.4
1907	13	33.4
1908	41	33.4
1909	28	33.4
1910	47	34.4
1911	48	34.4
1912	26	34.4
1913	35	34.4
1916	38	34.4
1917	14	34.4
1918	27	34.4
1919	40	34.4
1921	34	25
1922	14	25
1923	35	25
1924	7	25
1925	33	25
1926	26	25
1927	32	25
1928	22	25
1929	22	25
1930	36	41.8
1931	45	41.8
1932	24	41.8
1933	34	41.8
1934	51	41.8
1935	44	41.8
1936	58	41.8
1937	49	41.8
1938	26	41.8
1939	51	41.8
1940	32	36.9
1941	45	36.9
1942	28	36.9
1943	41	36.9
1944	43	36.9
1945	24	36.9
1946	34	36.9
1947	35	36.9
1948	46	36.9
1949	41	36.9
1950	10	27.9
1951	13	27.9
1952	41	27.9
1953	39	27.9
1954	29	27.9
1955	50	27.9
1956	19	27.9
1957	27	27.9
1958	19	27.9
1959	32	27.9
1960	14	21.2
1961	16	21.2
1962	21	21.2
1963	27	21.2
1964	33	21.2
1965	12	21.2
1966	17	21.2
1967	8	21.2
1968	34	21.2
1969	30	21.2
1970	51	40.9
1971	48	40.9
1972	35	40.9
1973	44	40.9
1974	26	40.9
1976	55	40.9
1977	44	40.9
1978	37	40.9
1979	28	40.9
1980	40	40.4
1981	26	40.4
1982	20	40.4
1983	58	40.4
1984	38	40.4
1985	37	40.4
1986	28	40.4
1987	52	40.4
1988	72	40.4
1989	33	40.4
1990	22	29.5
1991	53	29.5
1992	18	29.5
1993	30	29.5
1994	29	29.5
1997	24	29.5
1998	32	29.5
1999	28	29.5
2005	51	29
2006	23	29
2007	41	29
2008	19	29
2009	11	29
2010	33	33.2
2011	43	33.2
2012	64	33.2
2013	34	33.2
2014	16	33.2
2015	21	33.2
2016	32	33.2
2017	21	33.2
2018	42	33.2
2019	26	33.2
2020	45	35.9
2021	47	35.9
2022	27	35.9
2023	40	35.9
2024	33	35.9
2025	31	35.9
2026	28	35.9

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

First to last qualifying date each year at Lake Mills Wwtp
Year	First date	Last date
1893	1893-06-12	1893-09-21
1894	1894-05-16	1894-09-28
1895	1895-05-09	1895-09-22
1897	1897-06-12	1897-10-15
1898	1898-06-03	1898-09-29
1899	1899-04-27	1899-09-16
1900	1900-05-12	1900-10-06
1901	1901-04-29	1901-09-06
1904	1904-06-18	1904-08-24
1905	1905-06-05	1905-09-28
1906	1906-05-17	1906-09-19
1907	1907-06-17	1907-08-11
1908	1908-06-06	1908-09-26
1909	1909-05-05	1909-09-13
1910	1910-06-13	1910-08-24
1911	1911-05-10	1911-09-01
1912	1912-06-25	1912-09-10
1913	1913-06-15	1913-09-07
1916	1916-05-26	1916-08-24
1917	1917-07-20	1917-08-27
1918	1918-05-31	1918-08-27
1919	1919-05-30	1919-09-09
1921	1921-05-21	1921-08-19
1922	1922-06-16	1922-09-08
1923	1923-06-01	1923-09-05
1924	1924-06-19	1924-08-30
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	1928-09-10
1929	1929-05-29	1929-09-03
1930	1930-04-10	1930-09-23
1931	1931-06-18	1931-09-20
1932	1932-06-17	1932-09-19
1933	1933-06-05	1933-09-08
1934	1934-05-06	1934-08-17
1935	1935-07-01	1935-09-24
1936	1936-05-06	1936-09-14
1937	1937-05-30	1937-09-30
1938	1938-06-20	1938-09-10
1939	1939-05-19	1939-09-28
1940	1940-05-13	1940-09-20
1941	1941-05-20	1941-09-22
1942	1942-04-27	1942-09-01
1943	1943-05-29	1943-08-31
1944	1944-05-29	1944-09-03
1945	1945-06-23	1945-09-07
1946	1946-06-16	1946-09-06
1947	1947-06-27	1947-09-19
1948	1948-06-01	1948-09-19
1949	1949-05-04	1949-08-27
1950	1950-05-24	1950-08-16
1951	1951-05-16	1951-08-30
1952	1952-04-28	1952-09-28
1953	1953-05-30	1953-10-02
1954	1954-06-11	1954-09-06
1955	1955-05-04	1955-09-18
1956	1956-05-22	1956-08-27
1957	1957-06-16	1957-09-01
1958	1958-06-30	1958-08-31
1959	1959-05-02	1959-09-22
1960	1960-07-21	1960-09-09
1961	1961-06-07	1961-09-10
1962	1962-05-16	1962-08-30
1963	1963-06-02	1963-10-06
1964	1964-06-08	1964-09-10
1965	1965-06-27	1965-08-15
1966	1966-06-22	1966-07-26
1967	1967-05-26	1967-07-29
1968	1968-06-05	1968-09-03
1969	1969-06-26	1969-09-14
1970	1970-04-29	1970-09-08
1971	1971-05-17	1971-10-03
1972	1972-05-18	1972-09-01
1973	1973-06-08	1973-09-03
1974	1974-05-21	1974-08-26
1976	1976-06-06	1976-10-01
1977	1977-04-18	1977-08-28
1978	1978-05-26	1978-09-19
1979	1979-05-09	1979-09-11
1980	1980-04-22	1980-09-08
1981	1981-06-05	1981-08-13
1982	1982-05-14	1982-10-06
1983	1983-06-10	1983-09-10
1984	1984-06-05	1984-09-26
1985	1985-05-14	1985-09-19
1986	1986-04-26	1986-08-16
1987	1987-04-20	1987-09-05
1988	1988-05-21	1988-09-18
1989	1989-05-24	1989-08-22
1990	1990-06-12	1990-09-07
1991	1991-05-11	1991-09-10
1992	1992-05-16	1992-08-25
1993	1993-05-09	1993-08-30
1994	1994-05-21	1994-09-16
1997	1997-06-13	1997-10-08
1998	1998-05-17	1998-09-20
1999	1999-05-30	1999-09-06
2005	2005-06-05	2005-10-06
2006	2006-05-28	2006-08-17
2007	2007-05-15	2007-10-08
2008	2008-06-08	2008-09-03
2009	2009-06-21	2009-08-16
2010	2010-05-24	2010-09-24
2011	2011-05-23	2011-09-13
2012	2012-05-16	2012-09-13
2013	2013-05-01	2013-09-20
2014	2014-05-09	2014-09-01
2015	2015-06-10	2015-09-17
2016	2016-05-26	2016-09-21
2017	2017-05-17	2017-09-26
2018	2018-05-24	2018-10-04
2019	2019-06-28	2019-10-01
2020	2020-05-26	2020-08-29
2021	2021-05-02	2021-10-02
2022	2022-05-11	2022-09-02
2023	2023-05-30	2023-10-02
2024	2024-05-19	2024-09-22
2025	2025-05-16	2025-10-05
2026	2026-05-27	2026-10-13

Every Fixed Threshold

Fixed thresholds at Lake Mills Wwtp
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	120	72	1988	28
35 C (95 F): Days	80	27	1988	2
40 C (104 F): Days	6	6	1936	2
90 F (32.2 C): Days	118	53	1988	14
100 F (37.8 C): Days	12	10	1936	1
110 F (43.3 C): Days	1	1	1936	1
0 C (32 F): Ice days (max	120	89	2014	38
0 C (32 F): Frost days (min	115	183	1925	88
-10 C (14 F): Days with min	115	86	1978	32
-20 C (-4 F): Days with min	115	35	1963	8
-30 C (-22 F): Days with min	32	6	1936	4
20 C (68 F): Tropical nights (min	113	48	1921	20
25 C (77 F): Days with min	17	7	1921	2
10 mm (0.39 in): Days with 10 mm or more rain	108	52	2018	26
25 mm (0.98 in): Days with 25 mm or more rain	108	13	1919	7
50 mm (1.97 in): Days with 50 mm or more rain	74	5	1960	1
100 mm (3.94 in): Days with 100 mm or more rain	7	2	1996	1
10 cm (3.9 in): Days with 10 cm or more snowfall	68	12	1951	1
25 cm (9.8 in): Days with 25 cm or more snowfall	9	2	1971	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 Lake Mills 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Lake Mills Wwtp Threshold Days by Year (USC00474482)

Key Facts for Lake Mills Wwtp Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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