Congrats Henry! But... Don't be too surprised when the RED X and/or Yellow Question Mark returns someday.
CWOP's MADIS system has some serious accuracy problems of its own.
Just stay focused on the TWO THUMBS UP. That is the ONLY part of the QC ratings that actually matter, because those indicate your actual MADIS viability. The "THING" that hovers above those two thumbs are a not so well executed "addition" by the guys over at CWOP, and it could use a QC system of its own.
I speak from experience.
Here is mine:http://weather.gladstonefamily.net/site/D2149
Here is a neighbor .7 miles away with the same exact station:http://weather.gladstonefamily.net/site/C3796
A couple of weeks ago, I had the RED X and he had the Green Check Mark.
We live up here in the Sierra's so our temps are much harder to give a "blanket" range too, so you may have less of a problem with this than we do up here. Just don't loose any sleep over this if things change on your QC page.