MENDOTA

MONONA

WINGRA

Date lake froze

20  Jan

18 Jan

4 Dec,  10 Jan

Date lake opened

27 Mar

26 Mar

4 Jan,  25 Mar

Duration, days

66

67

106

Date lake froze

19 Dec

8 Dec

25 Nov,  3 Dec

Date lake opened

24 Mar

12 Mar

28 Nov, 14 Mar

Duration, days

95

94

104

Median Freeze Date

20 Dec

15 Dec

29 Nov

Median Opening Date

5 Apr

31 Mar

25 Mar

Median Duration, days

105

104

116

Earliest Freeze Date

23 Nov 1880

22 Nov 1880

2 Nov 1913

   Second Earliest

25 Nov 1857

23 Nov 1857

5 Nov 1991

Latest Freeze Date

30 Jan 1932

30 Jan 1932

29 Dec 1877

   Second Latest

20 Jan 2007

18 Jan 2007

24 Dec 2001

Earliest Opening Date

27 Feb 1998

26 Feb 2002

26 Feb 1998

   Second Earliest

7 Mar 2000

27 Feb 1998

2 Mar 1882

Latest Opening Date

6 May 1857

4 May 1857

29 Apr 1881

   Second Latest

3 May 1881

1 May 1881

19 Apr 1975

Shortest Duration

21, 2001–02

49, 1997–98

70, 1877–78

   Second Shortest

47, 1997–98

52, 1999–00

77, 1999–00

Longest Duration

161, 1880–81

160, 1880–81

164, 1880–81

   Second Longest

151, 1856–57

151, 1856–57

145, 1887–88

Range of Seasons

1852/53-2006/07

1851/52-2006/07

1877/78-2006/07

Number of closings

153

154

70

Number of openings

153

153

70

Number of durations

152

153

56

Long-term variation in ice duration on Lake Mendota
(figure)

Lake Mendota Ice Records
(table)

Long-term variation in ice duration on Lake Monona
(figure)

Lake Monona Ice Records
(table)

 Long-term variation in ice duration on Lake Wingra
(figure)