Temperature trends map

The map below shows the geographic distribution of post 1990 temperature trends derived from station data contributing to HadCrut3 global temperature anomalies. The Had/CRU anomalies are relative to the period 1960-1989 so they all measure warming/cooling relative to that baseline. The average anomaly(AA) between 1990-2010 is then calculated for each station. The key to interpret the map shown below is as follows:

Colour    Anomaly change(Deg.C)
Red           AA > 1.0
Orange        0.4 < AA < 1.0
Yellow        0.0 < AA < 0.4
Cyan          -0.4 < AA < 0.0
Blue          -0.4 < AA

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This is an active flash map so you can zoom in by dragging a rectangle,  and view the data by clicking on any station, (zoom out by clicking anywhere else).