Late Summer Cooling

Since I'm on the theme of changes in late summer in the Interior, here's another one. Hot days are concentrated near and not long after the Solstice. Here is a plot of the frequency of days (by week) with maximum temperatures ≥80F. Notice the sharp peak in early July and then the dramatic fall. This is a reflection of both the increased cloud cover (i.e. the rainy season) and the lowering sun angle. The solar noon sun is now less than half way up the sky.