This map is an interface to compare adjustments made by NCDC and CRU to about 2800 weather stations. Zoom in by dragging a rectangle over a region, and then click on a station. The resultant plot shows a stack of 4 graphs. The bottom displays the monthly average temperatures from CRUTEM4 (green) V3U (blue) and V3C (red). The next graph hows the monthly ‘anomalies’ relative to 1961-1990, and above that are the averaged annual anomalies. The top graph shows any adjustments made by V3C (red) and CRUTEM4 (green) relative to the ‘raw’ values V3U.
The size of the red dots indicates the time span of the station. Clicking opens a new window. Close it, then zoom out (click anywhere) and select another station. An example graph from Iceland is shown below.
P.S. there is a redundacy in some of the US stations as NCDC add a last digit to WMO numbers for nearby stations. For the moment you get the last one – sorry. I can fix it later.