Winter in Tracy, CA is not cold! Get over it!
Every year around the middle of November customers come in because they want to get their cars ready for the "cold." Brrrr.
I grew up in central Connecticut and lived in parts of Canada (Ottawa and the Toronto area). I worked for Honda Canada and took part in cold weather testing in Kapuskasing, Ontario (500 miles plus north of Toronto). It gets really cold in Kap. Like minus 40 Fahrenheit cold.
So I know what cold feels like. Trust me freezing is not cold. Especially for a car.
Now don't get me wrong, when it gets to 32 F water can freeze. Antifreeze is needed to keep the coolant in your car from freezing. Your windshield washer fluid might freeze too. So precautions should be taken.
But when you come into my store and tell me how your poor car might not be able to start when it gets cold I just have to shake my head.
Your car, any car built in the past thirty years or so, is capable of operating between 120 F and -40 F with relative ease. Age and mileage does lessen its capabilities somewhat but if you maintain it to original specs it will be fine.
You do not need to warm up your car. Unless you have to scrape ice from the windows just get in, start it, and drive off. It will reach its full operating temperature in just a few minutes.
I did some checking and came across a paper on emissions and catalyst efficiency by E.A. Feest and D.C.W. Blaikley, CITA Study No 4 - Influence of catalyst of temperature on effectiveness of in-service testing - Final Report. Here's a few pertinent passages:
"The generally acknowledged view (Ref. 2) is that the time required for catalysts to attain their light-off temperature is considerably shorter than that required for the engine to warm up (e.g. 2 minutes for the catalyst rather than eight minutes for the engine)."