Months that begin on a Sunday will always have a "Friday the 13th".

Months that begin on a Sunday will always have a "Friday the 13th".

The converse is also true: any month that has a Friday the 13th will begin on a Sunday. Furthermore, if February (in a non-leap year) starts with a Sunday, then February and March will both have a "Friday the 13th". The last time this happened was in 2009, an unlucky year for many people.