My wakeup HR was 52, and my body felt pretty good during and after the run. Earlier in the week, and also last week, both of my legs tightened up during the run. Today, however, only my right leg tightened up. I walked/jogged the last three miles to avoid the possibility of injury due to the tight muscles. The fact that my left leg didn't tighten is a good sign that my body is adjusting to the distance.
It had rained during the night, and when I left there was still a slight drizzle. However, after about half an hour the rain stopped. The sky, though, remained cloudy until the last half an hour of the run.