Very nice again. Very Fall-ish.

Beautiful. What is the plant called?

@Janey Cat, it is a cultivar of panicled hydrangea called Limelight, scientific name Hydrangea paniculata Limelight.

I suspect live sterile florets on Hydrangea paniculata are often more colorful and actively living before a frost can burst all their cells, and kill those tissues - thus the progressively beigey to browner colors.

I am sure you have seen other flower parts undergo such a transition. In southeast Wisconsin, deciduous magnolias would not be unheard of in ornamental landscapes. I suspect that on the occasional warm spring, Star Magnolia and Saucer Magnolia burst forth with their attendant brilliant show of white and/or pink blossoms. But - come a cold night - the next day they are brown mush.

While not exactly the same, you are seeing the results of such a fall/winter temperature transaction.