I am very happy now that the temperatures are lower and landing in the 50s and 60s rather than the record-breaking 90-100s I had to train in for most of the summer months.  In fact, I enjoy running when the temperature is between 35-60F --the air is clear and crisp, and it feels easier to me.  And I will be ecstatic if the temperature for the Chicago Marathon stayed in the 45-65F range this time.  We will just have to see...​