I know this was from a while back but georon pointed it out to me so I thought I's pop in and ask for feedback.
I created this app, I work for the snow survey. I'd love any feedback any of you may have. Government IT constraints being what they are we likely won't have this app running on our website anytime soon but we will be posting equivalent charts (and more) on the various state's snow survey and NWCC websites. They'll just be static links rather than a dynamic app (good if you want to hyperlink). In fact we are in the final stages of getting them posted. Utah already has ours (you may have guessed I work for the Utah snow survey).
and for individual sites:
I'd love any feedback you may have, just reply away and we'll see what we can do to get you the best product when we go into production soon.