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Q:
How common are Friday the 13ths?
A:

You can use a perpetual calendar to work out how many Friday the 13ths there are for every possible pattern of weekdays in a year. It turns out that every year has at least one Friday the 13th.


The largest possible number of Friday the 13ths in one year is three. Surprisingly, it turns out that a 13th is slightly more likely to fall on a Friday than any other day. This happens because the leap year rules make some patterns of weekdays happen more often than others. The winning patterns include many Friday the 13ths.


Here’s a table from Eric Weisstein’s World of Astronomy that shows how often the 13th falls on each day of the week, over four hundred years.

DayNumber of 13thsPercent
Sunday68714.31%
Monday68514.27%
Tuesday68514.27%
Wednesday68714.31%
Thursday68414.25%
Friday68814.33%
Saturday68414.25%

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February 20, 2018

1808 - Honore Daumier
1925 - Robert Altman
1927 - Sidney Poitier
1940 - Jimmy Greaves
1946 - Brenda Blethyn
1951 - Gordon Brown
1958 - James Wilby
1961 - Imogen Stubbs
1966 - Cindy Crawford
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