What, it gets cold here in January? I'm always amazed that people make a big deal that is goes below zero in January. It's winter, and yep, it does this, virtually every year. No reason to change ones life around....
And I get amused at how obsessed people are with having to us synthetic oils in this climate. Dino 5w30 oils have served us well for years, and modern fuel injection systems have spoiled us. Frankly, I worry more about the battery than I do the oil. Heck, My Jeep Cherokee still has dino 10w30 in it right now, and it runs fine (though garaged here at home so it doesn't see the worst of the cold - garage runs about 30-40 degrees warmer than outside temp, though that still means its 20 degrees in there!