C / decade and the simulated ensemble mean over the models, calculated from the grid boxes of the models where observations exist (which is flawed in my opinion, since
excluding of mostly the
high latitudes from the model data may emphasize a warm bias in lower
latitudes in the models making them appear warmer than they are, but a possible cold bias of the global observations data set is not
excluded in this way) had a trend of 0.3 deg.