Suddenly winter
Actually, not really "suddenly." We've had weeks of lower-than-average temperatures. But Thursday night, then again over the weekend, we got snow.
Sunday morning's snow was particularly nasty, because it turned to rain, then it got really cold. The net result is that any location that wasn't well plowed or sanded, or cleared, by the time the freeze hit, is now glazed over with a cement-like layer of ice.
Fortunately, I got out my snowblower early enough on Sunday morning that it wasn't an issue for us. I cleared a path to the front steps and the driveway, and about halfway through the process, the rain started to fall.
I was drenched by the time I got back inside, but it was worthwhile. Others who presumed the rain would "wash away" the snow were sadly mistaken. But more rainy weather is forecast for later this week, so they may still be in luck.