It is impossible for Friday the 13th to occur in all 12 months of the one year.
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Some people believe Friday the 13th is bad luck. Same way with black cats with green eyes and umbrellas when there opened inside a building. Hopefully this helps :)
Every year is different. 2009 had three such days, whereas 2010 shall only have one, while 2012 will have three. It is like your birthday, never on the same day of the week.
Since there are 365.25 days in a year (approximately, if every month had the same number of days, the calendar would soon be out of synch with the seasons.
Linear growth: The population adds the same number every week/month/year.Exponential growth: The population multiplies bythe same number every week/month/year.
The month of March has 31 days in 2012, and it has 31 days every year. In fact, the only month that does not always have the same number of days every year is February. That is the only month whose length varies. All the others have a fixed length.