This Monet (I think it's the right one) is in the Getty, in L.A. When I was there, my niece couldn't understand what all the hubbub was about, so I told her to go over and look closely at the "white" snow. Only then did she realize that there wasn't any white, but dabs of grey, blue and pink.
I love that Monet; it's one of my favorites. I can see him outside painting the other seasons of the haystacks, but it's hard to see him painting in the snow. It's COLD outside then. So this must have been a studio work, at least in part. The sunset and the blues and purples are awesome.