Thus what he found is that the Urban Heat Island effect exists. I did not know that this was controversial.Venema understands the temperature data homogenization issues, and concludes:
Good news is that the study finds that after homogenization, the station quality is no longer a problem for the mean temperature.
Had the new study found clear differences in the temperature trend in the homogenized data, the study would have been interesting for the general public. Because it is the homogenized data that used to compute large scale trends in the real climate. If the homogenized data would still be partially polluted by the urban heat island effect that would have been an error. The aim of homogenization is exactly to remove artificial changes from the raw data. It seems to do so successfully, now acknowledged by WUWT the second time.Earlier he had this review of data homogenisation of monthly and annual data from surface stations. It gets into the weeds, but of course that's often where the science resides.
This is clearly a paper that needs a thorough peer review, which I suspect will take a good while if it's done right. Watts et al don't say where it is being submitted (you almost get the impression that's an afterthought), but that will matter. (E&E, for example, won't cut it.)
Then there are the deluded people who somehow believe one paper about 2 percent of the globe, that finds that quality sites have a 1979-2008 trend of +0.155 C/decade (3 significant figures?? error bars??) will change the debate about global warming and the influence of CO2. (Just like, I guess, the other hundred times they thought some result settled the debate for good.) It won't, of course.