Winter Lesson 1 - If you are wearing a scarf around your neck and over your nose, your glasses get totally fogged up immediately. I had to ride without my glasses on. Luckily I can see well enough without them to make this okay.
Winter Lesson 2 - My knit gloves and short boots with regular socks on are fine in 30° and 40° weather, but not in 20° weather! Going shopping tomorrow for better winter riding gloves and definitely planning to wear 2 pairs of socks next ride.
Winter Lesson 3 - People who recommended fenders for winter riding around here were correct! Also going shopping for fenders to help keep me and my drive train a little cleaner and less slushy.
Winter Lesson 4 - Sights like those below and the quiet peacefulness of winter riding in my small village and just outside of it on country roads make all of the above so worth it!