Tough year, everyone except the PNW is below average.
For April, you can get powder but I wouldn't count on it. Sun is more often the norm. The worst is when you get the days between the two. Cold, Windblown, icy crust. The only days of the season that I don't care to ride at all.
For Spring riding, if California gets the goods like they are going to, is by far the best. It's typically either nuking there or sunshine. The corn snow there is just fantastic.
After that, Utah or Colorado should be decent. Hopefully the regions get some decent snowfall before those dates.
Washington/Oregon have been the best bet this year by far. I am not sure about their spring cycles. Could be snow, rain, or sunshine. They do have a ton of snow on the ground though, so if you got either sun or snow, you'd be sitting pretty.