19F when I left and I sweated up a storm, huffing and puffing all the way to work. I have about 3 blocks of hills at the beginning of my commute that I usually take slowly as I'm still warming up, but for some reason I didn't slow down and cranked up them instead, then spun down the hill to midtown, tears in my eyes due to the cold wind obstructing my vision and making all the pothole avoidance even more interesting. Kept up a higher than normal pace all the way to work hence, the huffing and puffing.