View the ice-over and ice-out dates, and duration of ice cover, for Lake Monona dating back to 1852.
Annual Duration of Ice Cover
Click and drag anywhere on the chart to zoom in on specific data points.
Longest Duration
160 days
(1880-81)
Shortest Duration
44 days
(2023-24)
Average Duration
103 days
Five-Year Running Average
76 days
Freeze and Thaw Dates
| Winter | Freeze-Over Date | Thaw Date | Days of Ice Cover |
|---|---|---|---|
| 2023-24 | January 15 | February 28 | 44 |
| 2022-23 | December 19 | March 20 | 91 |
| 2021-22 | January 3 | March 26 | 82 |
| 2020-21 | December 29 | March 22 | 83 |
| 2019-90 | January 12 | March 20 | 82 |
| 2019-20 | December 16 | December 30 | |
| 2018-19 | January 10 | March 31 | 97 |
| 2018-19 | December 11 | December 28 | |
| 2017-18 | December 26 | March 29 | 93 |
| 2016-17 | December 16 | March 7 | 81 |
| 2015-16 | January 11 | March 13 | 62 |
| 2014-15 | January 1 | April 2 | 105 |
| 2014-15 | December 2 | December 16 | |
| 2013-14 | December 10 | April 10 | 121 |
| 2012-13 | December 31 | April 11 | 101 |
| 2011-12 | January 3 | March 12 | 69 |
| 2010-11 | December 9 | April 3 | 112 |
| 2009-10 | December 27 | March 25 | 88 |
| 2008-09 | December 10 | March 24 | 104 |
| 2007-08 | December 7 | April 7 | 122 |
| 2006-07 | January 18 | March 26 | 67 |
| 2005-06 | December 8 | March 12 | 94 |
| 2004-05 | December 24 | March 31 | 97 |
| 2003-04 | January 6 | March 20 | 77 |
| 2003-04 | December 25 | December 28 | |
| 2002-03 | January 4 | March 22 | 83 |
| 2002-03 | December 9 | December 15 | |
| 2001-02 | January 1 | February 26 | 56 |
| 2000-01 | December 13 | March 31 | 108 |
| 1999-00 | January 14 | March 6 | 52 |
| 1998-99 | December 30 | March 10 | 70 |
| 1997-98 | January 11 | February 27 | 49 |
| 1997-98 | December 21 | December 23 | |
| 1996-97 | December 20 | March 26 | 96 |
| 1995-96 | December 10 | March 24 | 107 |
| 1995-96 | November 29 | December 1 | |
| 1994-95 | January 5 | March 20 | 74 |
| 1993-94 | December 26 | March 31 | 95 |
| 1992-93 | December 24 | April 11 | 108 |
| 1991-92 | December 16 | March 16 | 91 |
| 1990-91 | December 23 | March 21 | 88 |
| 1989-90 | December 7 | March 15 | 98 |
| 1988-89 | December 29 | April 1 | 93 |
| 1987-88 | December 25 | March 25 | 91 |
| 1986-87 | December 13 | March 8 | 85 |
| 1985-86 | December 6 | March 29 | 113 |
| 1984-85 | December 24 | March 26 | 92 |
| 1983-84 | December 18 | April 3 | 107 |
| 1982-83 | January 9 | March 6 | 56 |
| 1981-82 | December 20 | March 30 | 100 |
| 1980-81 | December 20 | March 16 | 86 |
| 1979-80 | December 17 | March 30 | 104 |
| 1978-79 | December 9 | April 5 | 117 |
| 1977-78 | December 7 | April 7 | 121 |
| 1976-77 | December 1 | March 14 | 103 |
| 1975-76 | December 21 | March 20 | 90 |
| 1974-75 | January 2 | April 7 | 95 |
| 1973-74 | December 20 | March 24 | 94 |
| 1972-73 | December 7 | March 7 | 90 |
| 1971-72 | January 4 | April 8 | 95 |
| 1970-71 | December 15 | March 18 | 93 |
| 1969-70 | December 16 | March 18 | 92 |
| 1968-69 | December 15 | March 26 | 101 |
| 1967-68 | December 24 | March 20 | 87 |
| 1966-67 | January 5 | April 3 | 88 |
| 1965-66 | January 11 | March 17 | 65 |
| 1964-65 | December 15 | April 8 | 114 |
| 1963-64 | December 18 | March 19 | 92 |
| 1962-63 | December 12 | April 3 | 112 |
| 1961-62 | December 15 | April 7 | 113 |
| 1960-61 | December 19 | March 27 | 98 |
| 1959-60 | December 29 | April 8 | 101 |
| 1958-59 | December 8 | April 12 | 125 |
| 1957-58 | December 12 | March 31 | 109 |
| 1956-57 | December 13 | March 15 | 92 |
| 1955-56 | December 6 | March 24 | 109 |
| 1954-55 | December 31 | March 24 | 83 |
| 1953-54 | December 30 | March 12 | 72 |
| 1952-53 | December 17 | March 20 | 93 |
| 1951-52 | December 16 | April 6 | 112 |
| 1950-51 | December 11 | April 8 | 118 |
| 1949-50 | December 15 | April 7 | 113 |
| 1948-49 | December 24 | March 26 | 92 |
| 1947-48 | December 9 | March 26 | 108 |
| 1946-47 | December 18 | April 5 | 108 |
| 1945-46 | December 12 | March 21 | 99 |
| 1944-45 | December 18 | March 17 | 89 |
| 1943-44 | December 14 | March 24 | 101 |
| 1942-43 | December 7 | March 31 | 114 |
| 1941-42 | December 29 | March 24 | 85 |
| 1940-41 | December 3 | April 9 | 127 |
| 1939-40 | December 31 | April 11 | 102 |
| 1938-39 | December 19 | March 31 | 102 |
| 1937-38 | December 1 | March 22 | 111 |
| 1936-37 | January 5 | April 12 | 123 |
| 1936-37 | December 4 | December 30 | |
| 1935-36 | December 11 | March 27 | 107 |
| 1934-35 | December 20 | March 28 | 98 |
| 1933-34 | December 13 | March 26 | 103 |
| 1932-33 | December 10 | March 27 | 107 |
| 1931-32 | January 30 | March 30 | 60 |
| 1930-31 | December 16 | March 24 | 98 |
| 1929-30 | December 3 | March 17 | 104 |
| 1928-29 | December 21 | March 27 | 96 |
| 1927-28 | December 9 | March 26 | 108 |
| 1926-27 | December 5 | March 17 | 102 |
| 1925-26 | December 10 | April 15 | 126 |
| 1924-25 | December 14 | March 27 | 103 |
| 1923-24 | January 1 | April 13 | 103 |
| 1922-23 | December 13 | April 19 | 127 |
| 1921-22 | December 19 | March 25 | 96 |
| 1920-21 | December 21 | March 16 | 85 |
| 1919-20 | December 3 | March 28 | 116 |
| 1918-19 | December 27 | March 20 | 83 |
| 1917-18 | December 8 | April 3 | 116 |
| 1916-17 | December 16 | April 11 | 116 |
| 1915-16 | December 15 | April 4 | 111 |
| 1914-15 | December 15 | April 9 | 115 |
| 1913-14 | December 27 | March 20 | 83 |
| 1912-13 | December 19 | April 2 | 104 |
| 1911-12 | December 18 | April 9 | 113 |
| 1910-11 | December 8 | March 21 | 103 |
| 1909-10 | December 18 | March 24 | 96 |
| 1908-09 | December 9 | April 6 | 118 |
| 1907-08 | December 11 | March 26 | 106 |
| 1906-07 | December 8 | March 24 | 106 |
| 1905-06 | December 14 | April 8 | 115 |
| 1904-05 | December 13 | April 3 | 111 |
| 1903-04 | November 27 | April 15 | 140 |
| 1902-03 | December 26 | March 21 | 85 |
| 1901-02 | December 14 | March 27 | 103 |
| 1900-01 | December 14 | April 11 | 118 |
| 1899-00 | December 25 | April 16 | 112 |
| 1898-99 | December 7 | April 15 | 129 |
| 1897-98 | December 15 | March 26 | 101 |
| 1896-97 | December 3 | April 5 | 123 |
| 1895-96 | December 4 | April 1 | 119 |
| 1894-95 | December 25 | April 8 | 104 |
| 1893-94 | December 2 | March 11 | 99 |
| 1892-93 | December 11 | April 7 | 117 |
| 1891-92 | December 27 | April 1 | 96 |
| 1890-91 | December 24 | April 16 | 113 |
| 1889-90 | January 14 | March 29 | 74 |
| 1888-89 | December 29 | March 26 | 87 |
| 1887-88 | November 28 | April 13 | 137 |
| 1886-87 | December 5 | April 15 | 131 |
| 1885-86 | December 7 | April 17 | 131 |
| 1884-85 | December 17 | April 17 | 121 |
| 1883-84 | December 17 | April 15 | 120 |
| 1882-83 | December 7 | April 13 | 127 |
| 1881-82 | January 1 | March 19 | 77 |
| 1880-81 | November 22 | May 1 | 160 |
| 1879-80 | December 16 | March 18 | 93 |
| 1878-79 | December 16 | April 10 | 115 |
| 1877-78 | January 6 | March 9 | 62 |
| 1876-77 | December 5 | April 16 | 132 |
| 1875-76 | January 10 | April 10 | 91 |
| 1874-75 | December 12 | April 14 | 123 |
| 1873-74 | November 29 | April 14 | 136 |
| 1872-73 | November 28 | April 18 | 141 |
| 1871-72 | November 30 | April 20 | 142 |
| 1870-71 | December 22 | April 1 | 100 |
| 1869-70 | November 24 | April 11 | 138 |
| 1868-69 | December 10 | April 15 | 126 |
| 1867-68 | December 14 | March 31 | 108 |
| 1866-67 | December 12 | April 19 | 128 |
| 1865-66 | December 14 | April 18 | 125 |
| 1864-65 | December 9 | April 5 | 117 |
| 1863-64 | December 11 | April 20 | 131 |
| 1862-63 | December 7 | April 5 | 119 |
| 1861-62 | December 1 | April 13 | 133 |
| 1860-61 | December 2 | April 10 | 129 |
| 1859-60 | December 6 | March 26 | 111 |
| 1858-59 | December 11 | March 15 | 94 |
| 1857-58 | November 23 | March 22 | 119 |
| 1856-57 | December 4 | May 4 | 151 |
| 1855-56 | December 18 | April 14 | 118 |
| 1854-55 | |||
| 1853-54 | December 21 | ||
| 1852-53 | |||
| 1851-52 | December 13 | March 25 | 103 |