First polar vortex of the winter, and so far it’s about par for the course. You get reminded why you own all those merino wool base layers, and quickly relearn how to layer properly. The one upside about this weather is that it’s too cold for clouds, so you can sit in front of any south facing windows and enjoy some sunlight.
Fortunately it looks like the worst will pass in a few days and Chicago will return to perfectly acceptable winter biking weather. Nothing a few layers, cycling boots, and some toe warmers won’t solve.