Roni, there are a lot more snow sensors in Oregon than the ones on the ski website you posted.
For a comprehensive look try:
http://www.or.nrcs.usda.gov/snow/maps/oregon_sitemap.html
This one shows 57" at Annie Springs near Crater Lake as of today at 6020’ elev. and you would find the Oregon PCT at that elevation frequently, but usually lower. Cascade Summit (O’Dell Lake) shows 37.6" at 4880’ elev. The Irish Taylor site at the south end of Three Sisters Wilderness is showing 56" at 5500’ elev. McKenzie pass is 28.2’ at 4800’ elev. As you move north, there is less and less snow at a similar elevation. The sensor at Hogg Pass is reporting only the 1/2" that fell last night. I am not sure exactly where Hogg Pass is, but it is at 4760’ elev. somewhere near Santiam Pass. I would guess based on this reading that you will see substantially less snow after you emerge from the north end of Three Sisters Wilderness. Going north the next snow sensor that is anywhere near the PCT is a hundred miles or more north of Santiam Pass at Clackamas Lake which is a small lake just south of Timothy Lake. At 3400’ there is less than 2" of snow, all of which accumulated in the last few days. I say it’ll be gone by Friday and you’ll be snow free nobo until the final climb up to Timberline Lodge where there is now 24" at 5400’. The PCT around the west side of Mt. Hood goes up around 6000’ as I recall and down to under 3000’ then up again before it spills out down to the Columbia River.
Bottom line for Oregon right now: It is a very low snow year, but there is snow. There was a little new snow along the Cascade crest last night. In the southern half of the state you will be slogging through quite a lot of snow and where the snow is gone you will encounter epic bug populations. It would make a lot more sense to cover Oregon sobo than nobo at this point.
I don’t think Washington’s data is quite as easy to access, but I’ve heard recent media accounts of no snow at White Pass for instance. For my money, I’d want to start in Washington sobo rather than Oregon nobo, but not for another 3 weeks or a month.
CAVEAT: I’ve never thru-hiked the PCT. I know Oregon pretty well and Washington not so well. I haven’t hiked through any of these sites since last summer and I haven’t eyeballed any of them since February.
Hope this is helpful. I’m sure So Cal is a bit daunting.
HuffnPuff