When it gets really cold out, my Wh/mi goes through the roof. It's partly due to thicker air, partly due to increased viscosity and rolling resistance, but there's also a huge increase in frontal area when I start dressing in layers. Plus, roads around here aren't neatly cleared all the way to the curb in winter.
It's slow going, too much cold air stings my lungs, and you really have to share the road with cars. Hence, I have a rule: I hang up my bike in the basement upon the first snow accumulation, and it stays there until spring.
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