Originally Posted by
jlstrat
It was 15 degrees F here in Central PA yesterday and 12 this morning. I rode about 20 miles yesterday, and it was very hard work. I'm wondering if other cyclists here ride fewer miles in this kind of weather, of if they just don't ride at all.
My winter speeds are usually down: average speed below 14 mph versus about 16 or more in summer. I attribute it to wearing heavier and more clothing, plus facing stronger winds.
Someone above said the air is thicker. I'm not sure if that is true. I always felt like humid days were the worst for air resistance. But I would not be surprised to learn that colder air is more difficult to breathe efficiently.