If I let a headwind bother me I wouldn't ride all winter. I would probably drive if there were more than 30 MPH winds predicted, but 10 or 20 I just ride.
8 to 10 MPH is kind of normal around here, and it's always a headwind on the way home. I don't get a tailwind on the way in because there is rarely wind in the morning, it picks up in the afternoon.
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Work: the 8 hours that separates bike rides.