Windy is awesome, hands down it really is fantastic.
One suggestion that might make it even better for those who use it for flying/aviation - and ISA temperature deviation view, under temperature, for the altitude/level selected on the slider.
This should be a fairly easy thing to do, as the models can already show the temperature at those altitudes. The ISA Standard Temperature formula is not complex either.
It might be a little niche but if there's interest in this, I throw the idea out there.