RP and seasons?

Question that keeps bothering me. How do you rp seasons? We have ingame celebrations like winter veil, but for example Stormwind looks like it's summer all the time.

Simple: You don't. You do go along with holiday events, but since the game-world does not change, we simply do not incorporate the change of seasons in our roleplay.

Or you could do as we do and roleplay organizing the thing, involving others who don't usually roleplay into it. I will not even charge you for the idea. Sure enough, it might seem like noone really cares initially, but it does make the RP'ers more visible than hiding inside the Stormwind Keep or a bar. I have gotten a few whispers about reactions from random people passing by, and some even went along for the stuff we organized (drunken ram racing at brewfest for instance).

Thx everyone for your time and replies:)