Were I live (west Norway) we've had clear skies and freezing temps (-4 midday) for a week.
Oddly enough, as the frost layer thickens so does grip (at least with studded winter tyres).
This morning it was +5, with 10cm of snow on the ground, and light rain in the air. By the time I got to work I looked like a giant vaguely human shaped slush puppy.
If its cold tonight, the lumpy slush will turn to lumpy ice, which makes for pretty tricky riding conditions.
I love it though.
It means that my commute varies wildly from day to day, even if the route does'nt ;)
You're making me jealous!