It might have something to do with the quality of your diet, too. In the summer, people tend to eat fresher foods, higher fiber things, lighter items. In the winter, hearty soups and richer foods (plus veggies that aren't as fresh) might affect the difference you are seeing.
Also, when you ride during the winter might matter. There are studies that show that some people burn more calories with early morning workouts and others that show some people do better in the afternoon/evening. If your winter workouts are after work, perhaps you are a morning person and actually burn more then? Or vise versa - if you workout before work in the winter, perhaps your summer afternoon rides are the ones that rev your metbolism a bit higher.



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