1) Because it is warmer, and who doesn't like warm weather?
2) You hate America is you hate warm weather.
3) See #2
4) NBA and NHL playoffs.
5) I dare you to point out another time where it's socially acceptable to chase down a truck driven by a creepy dude, all for the sake of ice cream.
6) Two words: short shorts.
7) Barbecues. And by barbecues, I mean retarded amounts of beer while eating delicious food outside.
8) Fireworks in the snow just isn't as cool.
9) You can't go boating on ice.
10) All the awkward, pale looking kids look much less pale, which is a good thing.
12) You can finally put away those pants that DO make your ass look big.
13) See #11
14) By using your air conditioner instead of your heater, you use less gas, and mother nature loves you a little more.
15) There's more of your favorite local people out on the streets doing outrageous things for a few bucks. Who doesn't like cheap entertainment?
Anything else I missed?