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Try this, next time.
Take the battery out, and keep it in the house till you're ready to start the jeep. Pop the battery back in, and see if that works.
Might narrow down the potential issues. Typically, unless you're using the wrong motor oil for the climate, or have a starter motor that's going bad, most starting problems are battery related. Now, unless we're talking bellow 10 degrees, the engine should still be able to start, though with some difficulty. Like, a REAL slow turn over the first time, then another slow turnover, then give it a second, try again, and it should turn over fairly well. Too much BELLOW 10 degrees, you run into an assortment of other issues...and I mean 10 degrees ambient, not wind chill. But anything under...oh, say, 15 degrees, and not even that cold if the car sits for more than 12 hours, can reduce the power a battery can feed into the starter. Less juice, less torque.
Yes, pulling the battery plus some un-freezing was how I got the jeep to start. It was -10 ambient with a strong wind coming off a large pond, parking location.
The oil and coolant system are fine, each April I have them changed or flushed along with transfer case and diiff lubricant drain and change. I know it may sound odd for the once a year thing but I don’t drive that much, 3500 miles or less per year now. I also know that I don’t really need to do this each year, but It’s just piece of mind and just something I do each year.
I am contemplating changing out the alternator and going with a two battery system, this is a common upgrade if you are running lights and winches for off-road, both of which this jeep has.
I do appreciate your advice, noted and welcomed.