Hello there!
I've requesting this improvement for about a year now, and every update I hope it's there, but no :(
Technically, this should be super easy, as Windy gets its swell data from the respective US and European agencies, and that data comes in steps of 1 degree (223, 224, 225, you get the idea). But then Windy for some reason rounds it up (or down?) to the nearest 10 (220, 230, 240). Around where I live and surf, a change in 10° is a huge difference, and it makes Windy pretty much unusable for swell forecast. Please, please, fix this.