I doesn't get cold here in the Florida Panhandle like it does where most of you live but I still have motivation problems when it's in the 40's and grey and blowing. Mostly blowing. In the winter here it seems that there is a constant 25 mph wind. Last winter I found that my rides were gearing way back, both in distance and intensity, from my summer average.
It was downright pleasant here today, springlike, so I got in a fairly serious ride.