Winter for sure

Not that I couldn't have told from the snow and the wind, but juncos at the feeder are one of the signs.
Best guess—dark-eyed juncos being a species of strong variation, though only one should be found in this part of Ontario—is that this is a female slate-coloured dark-eyed junco. She was all by herself, and giving the house sparrows and house finches what-for when they didn't want her going after the fallen seeds.
I don't expect "cold enough that the snow freezes to your beak" to become a proverb any time soon, but it certainly provides further illustration of why all the birds are in fully fluffed up mode.