Derek H. Ogle - Lake Nebagamon Ice

Summary

Lake Nebagamon, in Douglas County, is 986 acres with a maximum depth of 56 feet.
Ice-in and out dates recorded from 1943 to 2023.
The average ice-in date is Nov 29 and the average ice-out date is Apr 19 (see Figure 1).
The range for both ice-in (Nov 7 to Dec 26) and ice-out (Mar 13 to May 14) dates is considerable, at approximately six to eight weeks (see Figure 1).
There are weak indications for a slightly later ice-in date and, possibly, a slightly earlier ice-out date in the last two decades (see Figure 2).
Since 1943 the average days of ice coverage was 141 days, though the range was considerable from 105 to 174 days (see Figure 3).
There is an indication that the length of ice duration has declined, on average, by a little over a week in the last two decades (see Figure 4).
Eight of the ten shortest ice duration seasons have occurred since 2000 (see Table 1), whereas only one of the ten longest ice duration seasons have occurred in that same time period (see Table 2).
Data were provided by Gary Hagstrom who received it from XXX. The original data acknowledged J Arthur, G DeBrunye, W Kiefer, A Mack, M Laskkowski, J Snydle.

Ice In and Out Dates

Season	In	Out	Duration
2023-2024	Nov 28	Mar 12	105
2011-2012	Dec 2	Mar 21	110
2015-2016	Dec 26	Apr 14	110
1998-1999	Dec 21	Apr 13	113
2009-2010	Dec 6	Mar 31	115
2016-2017	Dec 10	Apr 4	115
2004-2005	Dec 14	Apr 11	118
2001-2002	Dec 20	Apr 18	119
2007-2008	Dec 1	Mar 29	119
1944-1945	Dec 1	Mar 31	120
1984-1985	Dec 19	Apr 18	120

Table 1: Winter seasons with the 10 shortest ice durations, 1943-2023.

Season	In	Out	Duration
1995-1996	Nov 13	May 5	174
1991-1992	Nov 7	Apr 26	171
1943-1944	Nov 13	May 1	170
1949-1950	Nov 25	May 14	170
1955-1956	Nov 19	Apr 28	161
1964-1965	Nov 20	Apr 30	161
2013-2014	Nov 26	May 6	161
1946-1947	Nov 23	May 2	160
1959-1960	Nov 14	Apr 20	158
1978-1979	Nov 20	Apr 27	158

Table 2: Winter seasons with the 10 longest ice durations, 1943-2023.