You can probably go see your favorite IT band in concert as a gift
The only shivers you will get all day will be from other questionable things, not 30 degree cold weather
No homework, school's out!
You feel the effects of the (finally legal) alcohol quicker, because of the hot weather
It's not so hot that you're sweating bullets, unless you need to go see a doctor...
You're a summer baby
Cons
You're not in school, so no presents from your school friends, even though you got them presents during the year... those bastards!
Reminding friends that, no, you're not kidding, your birthday was two days ago.
Reminding friends that your birthday is tomorrow
Reassuring them that you don't need a present from them, it's okay
Even when you throw a party or someone does it for you, you're in college and all your friends are not in the same place
What you do on the anniversary of the day of your birth is probably what you did last week and will do every week until the end of summer (i.e. drive around, drink, sit on the beach, drink, go to the movies, borrow movies, smoke hookah, maybe a club)
Even if you were able to celebrate a half-birthday in school (because you have secretly longed to have your school friends give you presents), it would fall during the winter break
Quater-birthdays sound tacky
Your significant other, who lives in another state, is probably cheating on you
All the cool gadgets and sales come in December, when they expect people to be buying Christmas presents.
Your birth stone is a pearl (unimaginative, if you ask me) and you're a cancer (when has that ever been a good thing?)