Hredux: Ann Arbor weather

In January, I wrote about my general dissatisfaction with Michigan's fickle weather and described a scoring system for tracking my subjective assessment of the latest climate disappointment. One interesting side-effect is that it gave me an insight into when spring started for me based purely on when the weather day-by-day was consistently good. So for 2007, the heart of spring started on May 17 and ended on June 16.
For the transition into summer, things have flattened out considerably and we're oscillating between two bounds. For the first 151 days of the year, we've had 27 more nice weather days than crappy ones. That works out to about 68%. But I'm not going to get my hopes up.