When I left Paris on Wednesday morning, snow would still not stick to the ground in Paris. However, out at airport at Roissy (CDG), it was a different story; all of the gorund between the runways and taxiways was covered with several inches of white. By Saturday, it appears that snow was also sticking on the ground in Paris.
For example, here is a picture I shot during the trip:
Check out this image which was posted on Janaury 19 on a the blog of Parisian photographer Carina Okula: