Last weekend's near-80-degree weather is just a distant memory with our 10+ inches of snow outside. This winter -- our third in St. Louis -- has by far been the coldest and snowiest.
I vermicompost in my kitchen, and last summer I also started an in-ground worm bin outside. Before winter, I piled 3-4 feet of shredded oak leaves on top of the bin with the hope that it would provide some insulation: prior winters weren't all that cold, at least not for any extended period of time. I was pleasantly surprised last weekend to discover that not only have the worms survived this cold winter so far, but they appear to have thrived!
After yesterday's snowfall, I'm probably more concerned about flooding them out when it melts than I am about the cold, since the snow provides a lot of insulation and it's not the bitter cold we had earlier.