Based on the normal precip and above normal FLs throughout the winter, I'd say the snowpack on Rainier is probably pretty close to normal on the upper mountain (above 9K). I'd imagine the approaches are going to be bad on the lower glaciers by early summer (Carbon, Tahoma, etc.).
But, the climbing rangers and guide services would have a better idea of how things are shaping up. I would imagine that the cattle lines will be starting soon....