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It would seem that, over a sufficiently long period, each day of the week should be equally likely. However, that is not the case. For the 400-year period, from 1901-2300 (which includes three non-leap year centuries and one leap year century), the average number of Friday 13th per year was 1.72 which is somewhat larger than the intuitive 1.71428571...
In fact Friday is the most common day of the week for a 13th. Of the 4800 13ths in this period,
- 684 fell on a Thursday or on Saturdays (annual average 1.71)
- 685 fell on a Mondays or on Tuesdays (annual average 1.7125)
- 687 fell on a Sunday or on a Wednesday (annual average 1.7175)
- 688 fell on a Friday (annual average 1.72).
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In one year how many Friday the 13th's are there?
That depends on the year.
Is it possible to have a year with no Friday the 13th?
No. Every year has at least one Friday 13th, the most recent year with only one Friday 13th was 2011, with May 13th falling on Friday. The longest amount of time that can occur without a Friday 13th is fourteen months (1 year 2 months).
How many Friday the 13ths will there be in the year 2010?
There will be one Friday the 13th in 2010 - in August.
When will Friday the 13th be every month in the same year?
It is impossible for Friday the 13th to occur in all 12 months of the one year.
What is the date of next years Friday the 13th?
There is not 1, but 2 Friday the 13th's next year. Friday, 13 September and Friday, 13 December.
