Historical weather and snow data question

[markv]

Is there any source online for looking at snow/water equivalent, snow depth, or anything like that for the San Jacinto area? California's Sno-tel only seems to have info for the Sierra and points north. I'm interested in coming up with a data-backed estimate for average/median/outstanding times of year for when the trails reasonably clear out. From just the past few years and anecdotal evidence, it seems to vary wildly from late March to early June.

thanks!