There are 2 reasons for this:

1) The winds change. Last year year in Houston I sailed 2 days where the winds were over 15. This year, it seems 5 out of 7 days, its over 15. Talk to your local weather people, they keep track of things like that.

2) It always fun until you hurt yourself badly or break something you can't afford to replace or just realize, "I could die out here". After that, the wind seems stronger and the seas higher.