[NOTE: Please see the update at the bottom of the post for a more detailed explanation]
The denialosphere and the ‘winger echo chamber would like you to believe that a weather station in Darwin, Australia is Undeniable Proof of Something Nefarious regarding the global temperature record. Their evidence is that the GHCN raw station data have been *gasp* adjusted.
Here is the “smoking gun” graph that is currently causing all of the pearl-clutching:
Don’t you see? The GHCN has taken the raw station data and adjusted them to create a false warming trend! In the words of the post’s author [frothing, breathless emphasis in original]:
indisputable evidence that the “homogenized” data has been changed to fit someone’s preconceptions about whether the earth is warming
Got that? Some nefarious individual or group responsible for the GHCN has deliberately and fraudulently inflated the Darwin station temperature record to produce warming, not based on what has actually been occurring but in order to buttress claims of global warming.
After all, if these kinds of adjustments were actually justified, you would see the warming reflected not just in the GHCN-globalwarmspiracy-adjusted data, but in the official station record as well!
What?! This can only mean one thing: BOM is in on it, too! The conspiracy is even bigger than we ever imagined.
In all seriousness, if you’d like to read about the homogenization adjustments, you can do further reading here, here, and here.
[UPDATE: From Nick in the comments, Blair Trewin from Australia's National Climate Centre gives a detailed explanation of siting issues with the Darwin station.]