Every 28 years.
28 February 1958 was a Friday.
28 February 1975 was a Friday.
February 28, 2003 fell on a Friday.
February 28, 1947 was a Friday.
Friday
It was a Friday.
Feburary 28 1992 was a Friday.
February, 1980... and February 2008... and February 2036Actually this happens once every 28 years but the pattern gets out of sync after 2100 which happens to not be a leap year.
February 15, 1961 fell on a Wednesday.
February 13 falls on a Friday in the years that are not leap years. So, it occurs in non-leap years like 2009, 2015, 2026, and so on. Basically, if it's not a leap year, mark your calendar for a Friday the 13th in February.
It will be Friday 15th March 2013.