I have found two clear lines:
1) Cool summer weather is not disappointing, but a blessing (especially when it falls on moving day). Doesn't matter to me if its 60 degrees out at night and the pool water is getting chilly. I haven't even been in a pool (well, a non-hotel pool) all summer. Or last summer. And weather in the 70s? OK!
2) You need movers. There is a point in everyone's life when its just not practical anymore to scrounge up friends/acquaintances/anyone you know who likes beer and pizza enough to haul boxes and furniture out of one apartment and into another. This point is clearly demarkated when said friends would hate you forever after spending their entire day on said move (especially when it involves two flights of steep, narrow stairs and a pretty substantial amount of furniture that has never seen a dorm room).