Say you store a vehicle outside all winter, if there was an usually cold week, say -20 degrees Fahrenheit for example, is it possible for the car to be colder than the -20 since it sat weeks prior to the -20 temps?
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No. See the first and second Laws of Thermodynamics which has to do with the conservation of energy, that energy may be transferred from one object to another, and converted from one form to another, but cannot be created nor destroyed, and of gradients of energy which drives transfer from areas of high to areas of low
When the car is parked, and it is warmer than the ambient air around it, some energy in the car is stored as heat, and is relatively higher than that of the ambient air around it. Some of the heat energy of the car is transferred to the air and warms the air (effectively dissipating it since the air is almost infinitely attached to all the other air) until the car and the ambient air are at the same temperature at which no more exchange occurs.
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