Contact point stile voltage regulators output different voltages as under-hood ambient temperature changes. FSM has listing of these differences for old school regulators, and how to set them to deliver correct voltage.

I can't comment on how temperature effects solid state regulators if at all.

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC