Here's something the deniers might want to look at, a layman's explanation of temperature data set corrections. It's on Judith Curry's blog, an approved denier source, so denier cult members are permitted to look at it. I know how important it is for denier cultists to believe their souls have remained pure, unsullied by contact with heretics that contradict their religious beliefs.
Understanding adjustments to temperature data | Climate Etc.
Even at a layman's level, it's going to be beyond the grasp of most deniers, but I can't help out there. Complicated issues can only be dumbed down so much.
Nick Stokes has graphs of US and individual state adjustments at his blog Moyhu. Funnily enough, they are very similar to Goddard's graphs, or Homewood's. I am glad that this is getting some public traction and that the adjustments are being pulled out of the black box of NOAA algorithms. Interesting times.