I've been out on my bike when it was 23 degrees Fahrenheit once, and lots of other times in the upper 20,s, and I have noticed that it makes me a lot more fatigued. Even on one of our short rides which are 15-20 miles, I will get bleary eyed and sleepy for the rest of the day. I think maybe it burns more calories because of the cold, or it just makes me feel cold and stiff.



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Today it was 37°F and raining with a moderate south wind (I ride south in the morning, naturally) -- not exactly delightful, but perfectly fine with the right clothes.
