I find I eat more in the winter, but I've always felt like it was actually that I ate less in the summer because it is so hot and my appetite decreases. Once it cools down my appetite returns to normal.

Yes. Being in cold water for many hours a day leads to a sky-high metabolism. You can burn up to twice (in my experience) the calories swimming laps in 60F (or cooler) water. Air and water are fluids. Both experience very similar mechanical properties, such as the conduction of heat (albeit, water is a superior conductor to air.) Your body will do anything to maintain homeostasis unless there is something wrong with you, namely your uptake/production of thyroidal hormones. Whale blubber is popular in arctic regions because it is so high in energy!

I drink lots of cold liquids, wear light clothes, and take cold showers/baths. I am well convinced I burn a significant amount of more energy.

I woulda said yes last year at this time, before going paleo, but I'm not feeling any need to bulk up this year. At least not yet. I'm in Minnesota and outdoors most of my waking hours.

Makes you less hungry. Cold adaptation for winter starvation. Assuming no metabolic damage to patient. If youre leptin resistant your constantly hungry

Evolutionary perspective - I'm not sure if cold makes us hungry but I'm fairly positive early humans and other animals ate everything in sight when it got cold out due to food being more scarce. I would think animals in cold weather climates feast like crazy to prepare for a long winter with no vegetation and less wandering animals to snack on. Interesting question though, looking forward to answers from hackers smarter than I.

I always eat less in Winter and more in Summer, without even thinking about it. I have been this way for years. Perhaps less activity in Winter = decrease in energy requirements.