I have hung in temps from 6 to 95, walked in weather from a midwest T-storm with 50+ MPH gusts, to dead calm - 90+ degrees & 100% humidity, under blazing sun & week long overcast. But I think my favorite has to be Winter. To the point I have said (partially joking): "There are 2 seasons: Springsummerfall and Hiking!"
I also STRONGLY feel that my worst day hiking beat "hands down" my best day at work! BTW, I nearly died on the "bad hiking day", & I still had a better time than during my "good day" at work.