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From the comments:
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evanmjones says:
1.) The new USHCN2 sites are all COOP, not a CRN site among them. That leads to the question of what the raw CRN data is (gridded and ungridded) and why the suggestion to convert to CRN readings was not implemented.
2.) After the substitution, there are 2218 USHCN2 sites as compared with 1221 USHCN1 sites. By my count, 50 have been added, 53 discontinued. This has had the effect of somewhat increasing the adjusted historical trend by ~0.12C/century. This increase may be due to the change in stations, a change in adjustment, both (or perhaps some other factor entirely).
Heh-heh
They just freely admitted their weather stations are crap.
fyi
An admission that the ground-based data is garbage.
Yet this was a 2007 email. To the best of my knowledge, nothing was changed over the past 5 years.
The exposé on the weather stations was when I first discovered WUWT. It’s gratifying to find out they’re at least paying attention to the skeptics — even if they’re not actually doing anything.
Who's got guts for global warming debate?
Global Warming on Free Republic
Wow!!
Kudos to Anthony Watts.