As of 2015, the 29th of February was last on a Monday in 1988. It will next be on a Monday in 2016.
The leap day always falls 2 days earlier in the week (or 5 days later than the week if you prefer). In 2008 it fell on Friday, In 2012 it fell on Wednesday so it 2016 it'll be on a Monday.
Christmas fell on a Monday in 1899, and, since 1900 was not a leap year, Christmas fell on the next day of the week in 1900.
Most of the time, when a certain date falls on a certain weekday, in the following year it falls on the following weekday. But when the period between the date and the same date a year later includes the leap year date February 29, the next occurance of the date falls instead on the second weekday after the previous occurance. In 2006, Christmas fell on Monday. In 2007, Christmas fell on Tuesday. Because 2008 was a leap year, Christmas "skipped" Wednesday. In 2008, Christmas fell on Thursday. In 2009, Christmas fell on Friday. In 2010, Christmas fell on Saturday. In 2011, Christmas fell on Sunday. Because 2012 was a leap year, Christmas "skipped" Monday. In 2012, Christmas fell on Tuesday. In 2013, Christmas fell on Wednesday. In 2014, Christmas will fall on Thursday. In 2015, Christmas will fall on Friday. Because 2016 is a leap year, Christmas will "skip" Saturday. In 2016, Christmas will fall on Sunday. In 2017, Christmas will fall on Monday.
If you mean why is it not on Monday, as last year it was on Sunday, it is because this year is a Leap year, so there is an extra day, pushing Christmas Day to Tuesday.
Memorial Day has been celebrated on the last Monday of May since 1971. Before that it was always celebrated on May 30th. May 30, 1960 fell on a Monday.
1989, 1995, 2000, 2006. 2006 was the last time it fell on a Monday and because of the naughty leap year, the next Christmas (2012), will fall on a Tuesday (2011 it fell on Sunday). The next year Xmas falls on my lucky day WON'T BE ANY EARLIER THAN 25 DECEMBER 2017!!
Monday
February 29th, 2016- the next leap day- will fall on a Monday.
2000 - Monday 2001 - Tuesday 2002 - Wednesday 2003 - Thursday 2004 - Saturday (leap year) 2005 - Sunday 2006 - Monday 2007 - Tuesday 2008 - Thursday (leap year) 2009 - Friday 2010 - Saturday
As of 2016, Christmas Day was last on a Monday in 2006. It will next be on a Monday in 2017. An 11 year gap is common, caused by days being skipped over by a leap year. It was on a Sunday in 2011, but skipped Monday in 2012 and was on a Tuesday, as it was a leap year.
December 25, 1922 fell on a Monday.
March 13, 1961 fell on a Monday.