Spring is here?

It's March 20th, oh no, take that back, 21st, and 85 degrees here in Chi-town. Joggers, bikers, dog walkers (that's me!), stroller pushers - none of us know what to make of this phenomenon. But from the looks of it, nobody's complaining.

Here's a shot of my neighbor's gooorgeous tree. I don't know what it is, so if anyone out there does, I'd much appreciate the shout out.