A nice, clear, large image of some of the many variations of this common species. I especially like how it shows the irregular "extra" markings that are caused by things like damage or disease in the pupa. Those can be confusing because they create unusual or asymmetric patterns, but when individuals are seen together like this you can see how the anatomy doesn't change despite the color/pattern/damage to the wing covers.

Moved from ID Request.

sorry - couldn't resist :0)

They congregate, usually at high places (hill tops or mountain tops - depends on what is nearby), to overwinter. They will crawl under and between things like rocks, logs, leaves, etc. Commercial collectors take advantage of this to collect large numbers to sell at places like garden centers. And, of course most usually promptly fly away as soon as you release them.

Other species do similar. Among them, in your area there is a pink one (Coleomegilla maculata) that congregates under debris near streamside, ditches, etc. mostly in low lying areas, and there is a striped one (Paranaemia vittigera) that congregates under leaves and thatch along the margins of marshes.

Convergent Lady Beetle, Hippodamia convergens i believe.