So the puzzle of the day for you is: What are these patterns?
It's about the size of a nickel.
This one's about two nickels and a baby nickel smushed together.
It makes quite a difference whether you photograph them against the white background of the snow, or the distant dark background of the pine trees.
Got the answer yet? They're snow splotches, collections of tiny snow crystals blown together to form a splotch on your screen or window. On a screen door, not surprisingly, you get hundreds of them which form very easily in the right breeze.
But in the right conditions, they even form on glass, I guess because the exterior surface of the glass is so cold it can hold them in place - unless the wind gets too blustery and they get blown away.
Here's that screen door by the end of the afternoon.
Meanwhile, it was a deceiving end to our cold snap. It's only -7°C out now, quite a bit warmer, thanks to those southerly winds (above) that have pushed the cold Arctic air out of the way. But with the change in air masses, it's windy (surprise, surprise!). In fact it's very windy, averaging 35-40 km/h today, which meant both that it still felt cold, and that you were getting tiny crystals of snow blown in your face. Supposed to be 4 more inches of snow tonight for school starting tomorrow, but then temperatures will be more normal - until the rain on Tuesday!!
Remember that bomb cyclone a few days ago on the U.S. east coast? Here it is today, off the southeast of Greenland. Quite the remarkable pattern!