Haha I know exactly what you are talking about. I am in AZ and believe it or not it gets cold enough for mine to squeak too. Right underneath your brake booster is a rubber grommet where your steering wheel column goes through the firewall. It is supposed to be pliable but when it gets cold it gets solid. I have sprayed mine with wd-40 or silicone spray and it works, but not for long. It eventually just evaporates. You could probably put some white grease in there, and that would probably last longer, but here it gets hot, and exposed grease turns into liquid when it gets hot. I probably should just replace it, but seems like a lot of work, and it usually goes away after a couple of blocks and is only there on cold days, so like you I haven't spent too much time on it, but if you have a pretty consistent pattern, you could spray it with something before you take off, just to see if that is really your issue too.
Wd-40 should quiet it down enough for you to diagnose the problem, but it will come back in a few days if I am right.