From Wikipedia:
Friday the 13th is considered an unlucky day in Western superstition. It occurs when the 13th day of the month in the Gregorian calendar falls on a Friday, which happens at least once every year but can occur up to three times in the same year – for example, in 2015, the 13th fell on a Friday in February, March, and November. 2017 through 2020 will all have two Friday the 13ths, and the years 2021 and 2022 will have just one occurrence each.
A Friday the 13th occurs during any month that begins on a Sunday.
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