My husband is quite clumsy, (I am too sometimes) and has a history of getting hurt in some way nearly every Friday 13th, so I tend to keep a closer eye on him every Friday 13th. Does this count as being superstitious?
No, that's data analysis.
Per the dictionary: An irrational belief that an object, action, or circumstance not logically related to a course of events influences its outcome.
I'd say yes.
That's good that he's clumsy only a few times a year!
And you have to do it again in November.