spring is when...

...the temperatures start regularly hitting 70 degrees most days, and we get more sunny days than cloudy days, and fewer rainy days than in winter. OK, I can understand that, that makes sense. Apparently, however, it is also when some of the trees grow new leaves or burst into bloom, and others let their leaves turn red and fall to the ground. Couldn't they come to some sort of consensus on proper arboreal seasonal behavior? The six month perfect summer is only a month away. Schizophrenic as the climate is, I have no complaints. Just mystified confusion.