I am a sailor, but not lucky enough to live by the sea. I get to sail once or twice a year, for a week or two at a time.
I would happily subscribe to windy premium if I could do it on a monthly basis. But I really object to being forced to pay the same annual rate as those who use the app every day.
Please consider implementing the standard model used by most subscription apps - a monthly option and a discounted annual option. (For example, where the current annual subscription costs £18.49 per year, I would be happy to pay £2.49 or even £2.99 per month.)