NASA spokesmen Gavin Schmidt and James Hansen have observed that the US accounts for only 2% of the earth’s surface and conclude that problems in the US network don’t matter. There are only 6 Brazil stations in GHCN which have records extending through the 1930s and as late as 2004, which is an indication of the radical difference in coverage between two nations with large land areas. One of these stations is identified in the GHCN meta-data as “rural”. Can you identify which one?
I’ve shown GHCN unadjusted data, which, as far as I can tell, is the version used in the NOAA composite. I have no idea what version is used by CRU. I’ll look at GISS on another occasion. Recall that Jones et al and other studies cited by the IPCC have said that urbanization impact is under 0.1 deg C.