You're Hot and You're Cold

Yesterday morning, I ran right around this time (9 AM). It was 55 degrees, the sun was shining, and a gorgeous outside run beckoned. Aside from a pretty stiff wind, it was perfect running weather. I headed out to the lake for a 4 mile run. Having taken a few weeks off, I am slowly building back up. It was a fantastic run.

Now tell me this: how can it go from 55 degrees at 9 in the morning yesterday to a wind chill of 10 at 9 in the morning today? I hate this weather. I guess, however, I should be grateful for the nice weather yesterday.