What is the maximum number of Friday 13ths that can occur in a year which is not a leap year and in which months will they be?

Three is the maximum and they have to fall in February, March and November as they do in 2009 (in leap years the max is still three, but the months are January, April, and July as in 1984 and 2012) .

A normal year will have only one or two.

The most is three.

The least is one.