MENDOTA

MONONA

WINGRA

Date lake froze

14 Jan

31 Dec

21 Dec

Date lake opened

11 Apr

11 Apr

 9 Apr

Duration, days

  87

101

  109

Date lake froze

14 Jan

3 Jan

11 Dec, 17 Dec

Date lake opened

11 March

12 March

15 Dec, 8 Mar

Duration, days

57

69

86

Median Freeze Date

20 Dec

15 Dec

29 Nov

Median Opening Date

4 Apr

30 Mar

25 Mar

Median Duration, days

105

104

115

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

1852/53-2012/13

1851/52-2012/13

1877/78-2012/13

Number of closings

159

160

76

Number of openings

159

159

76

Number of durations

158

159

62

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)