I remember reading in an old farmer's "how to" book from the late 1800's that it was actually good to till in snow.
The snow picks up nitrogen the way rain does.
According to the book - most of the nitrogen is picked up by the rain (or snow) early, the longer the rain continues, the less nitrogen it contains because it's already stripped most of it out of the air.
So a long rain/snow storm is bad, since it provides mostly nitrogen free water that will dilute the early nitrogen and carry it away as runoff or too deep into the ground.
As snow - it was supposed to be a good thing to turn it into the ground if possible (preferably a light snow), to trap the nitrogen and keep it from evaporating, especially if there's a lot of carbon/organic matter to hold it. It also supposedly helps keep the ground from getting compacted.
... That was somebody's thinking back in the 1800's anyways.
I'm of course going on my poor memory of what I read - they were much more scientific about it in the book. I'm very curious about how this logic has stood the test of time.
Old wives tale, or advanced thinking for the time?
Would love to hear more thoughts on it.