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  • Exactly as hippy said, it's winter, it's hard to go as fast as you normally do in the summer.

  • In addition to the reasons you cited, another is vasoconstriction, the constricting of blood vessels in cold weather. Cycling Weekly recently ran an article about cold weather riding and quoted to Dr. Mark Garcia, who noted, “your heart will be working very hard to pump the blood round your body due to this increased vascular resistance and the subsequent increase in blood pressure. The knock-on effect is fatigue.”

    ...and that blood is thicker (but not in a positive, Katusha way).

    should be quicker...

    Probably, unless you're riding with more fatigue? That or someone's put water in your tubes or you're wearing a particularly un-aero facial expression.

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