Lol. How could it ever be meaningful?! I'm some local group ride schmuck, and they're a pro racer. Even in an ITT the comparison would be worthless as the wind changes from S to SW and it may be totally different (ignoring the fact I'd be laughably slower).
It's just for fun! Geesh. Just to look at "hey, I rode that exact strip of road!".
I'm not trying to do GCN show science or anything.