I know it's all mostly said in good fun but it's mostly using backyard obs to justify the overall picture.
For example, poster A could live in a location where it is 87 and say its hot and and summer is here. Poster B may live in a location (higher elevation, coastal, woods) where it is only 71 and say its cool, where is summer?
So who is correct? They're each correct per their location, but the overall picture, its more than likely a warmer pattern in place but where poster B lives there is local influences going on.