Sorry to intrude but considering the fact that the temperature will vary from 0 to -1 degree, I wouldn't worry about any snow accumulation. 20CM will fall from the sky, but not many will stay on the ground. It'll either melt when touching the ground or turn into rain from time to time therefore melting what would have stayed on the ground.
Sure sucks to see snow in mid-April, but we won't have to use our shovels until next December
Out here in Sask it's still winter we broke our all time record for snow , I have a 4 foot snow bank in my front yard and the forecast is another 15 centimeter this weekend. Major major flooding is going to happen if it ever warms up. It was also minus 20 two nights ago...... I got the winter blues.....
Well isn't that annoying...this winter and spring (so far) have sucked. Lots of cold this year and what seems like a lot less sunny days then normal. It seems that since the start of spring for every sunny day we get 3 cloudy/rainy ones.