GHCN-M V3 vs. V2
Global Station Data
GHCN-M station data spread using 250 km smoothing. The numbers on the top right are the area-weighted means over the grid boxes with data.
The same as the above figure but for two months with largest differences in the global mean V2 and V3.
The contiguous U.S. mean temperature anomalies using GHCN V2 and V3 and their differences. In the left column 12-month running means are taken to reduce the noise. On the right the monthly anomalies and their diference are shown for past ten years.
Above two figures show geographical distributions of the temperature anomalies and differences for the two months of largest mean differences shown in the line graph above.
Standard GISS Analysis
Some selected maps using GISS standard analysis, i.e. 1200 km smoothing for station data with HadISST1 plus OISST v2. See
Hansen et al. (2010) for details.