As observed by CLSS Volunteers; where difference in date occurs, the last date is reported here.

Freeze and Thaw

Freeze Thaw
8 December 2002 22 March 2003
11 November 2003 26 March 2004
26 November 2004 13 March 2005
15 December 2005 14 March 2006
10 December 2006 4 April 2007
3 December 2007 17 March 2008
2008 Not Recorded After 3 April 2009
Before 4 December 2009 18 March 2010
22 November 2010 31 March 2011
17 November 2011 31 March 2012
14 December 2012 19 March 2013
21 November 2013 31 March 2014
15 November 2014 14 March 2015
22 November 2015 4 March 2016
7 December 2016 29 March 2017

7 November 2017              11 April 2018

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