I happened to post this very subject in the wrong forum but here it is now. I thought this was kinda cool. It is based off of the Druid calender which is basically the Gregorian calender. It just happens that my favorite tree since I was a kid happens to be my birth tree as well. My birthday is September 10, so I'm a Weeping Willow. The description of the tree is pretty accurate to my personality but so are most generalized statements.
http://www.geocities.com/lavenderwater37/birthdaytrees.htm
gsx1138