Summer running

I was happy to be able to return to morning runs a few weeks ago, but then after a while I shifted back to afternoons so I could work on the training for my projected new career in the mornings. But this week has been so extremely hot that I've gone back to morning runs in order to try and beat the heat. Sunday I did 10K at about 5:30; Monday I did 4 miles (in the afternoon); Tuesday I did 5.9 miles at 5:15; yesterday I did 4 miles at 5:45; and today I did 7.25 miles at 5:15. The additional daylight and cooler morning temperatures are most welcome, as the last two days have seen highs above 90 degrees.