Cold weather = bad gas mileage?

[Kevin 1G Drummer]

Is my car just a freak, or have other people expierenced this as well? I've noticed it with other cars I've owned, but it seems by far the worst with my dsm. When the weather was warmer (30* and above) I was seeing about 23-24 mpg. Once Thanksgiving hit and the temps plumeted, I noticed my gas mileage went down to 18-19 mpg. I haven't really been letting it sit and warm up much longer than I did before, so I doubt that's the cause. I also haven't really changed my driving habbits. If anything, I'm easier on the gas pedal now than I was when it was warmer.