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No month has a guaranteed Friday the 13th. Every year does though.
A month must begin on a Sunday in order to have a Friday the 13th.
It last happened in 1998. The only time this phenomenon can ever occur is in a February-March pairing in a non-leap year. Calendars repeat themselves in intervals of 6, 11, 12…, and 28 years; 2009 and 1998 happen to match up in an 11-year cycle. However, even not knowing that you can use the provided virtual calendar website to step back through the years to manually determine the most-recently occurring instance of this Friday the 13th pairing. Just use the navigation links to go back or forward in time. Incidentally, it will happen again in 2015.
February, March & November
Two consecutive months can have a Friday the 13th only if one of them is February and the other is March. This will occur in the year 2015.
February/March is the only time Friday the 13th will happen in back to back months given it is not a leap year since exactly 28 days is needed between the dates. The last time… that happened was in 2009 the next time will be 2015.
Just August: Friday August 13th 2010.
May 2011 has Friday the 13th.
There in only one Friday that 13th in 2011. It's in May.
There were 3 in 2012: January, April, and July 2013 has 2: September and December 2014 has only 1: June 2015 has 3 again: February, March, and November
It is impossible for Friday the 13th to occur in all 12 months of the one year.
February, March, and November had a Friday the 13th in 1407, if date calculators can be trusted back that far.