Over at Nick Stokes blog they are trying to tear down a graph used by WUWT and Steven Goddard. They have made a valid point that the last few skyrocketing points may be because of late data.
But I thought I would take a look at monthly adjustments to tavg, tmin and tmax. Each of these 3 graph sets show the Final Temperature minus the Raw Temperature.
1) As you can see the USHN adjustments cool the past (especially the warm 20s/30s/40s).
2) I don’t know why they adjust tmax so much.
3) I really, really want to know why Dec/Jan/Feb (and to a lesser degree Nov and Mar) are so heavily manipulated. The adjustments can change by .5C from year to year. Bizarre.
Click for bigger.