Our PCMO oil will serve you well in your climate. It still contains AN and Ester to clean and keep clean.I live in southern New England. Low temperatures in winter 0 degrees F (rare). Normal 15-25.
Summer, 90-100. Car is always garaged overnight.
My commute to work involves a long climb over a steep hill each day. We call it a mountain but that is optimistic lol.
David