Simulations of Mediterranean and Northern Africa Precipitation
Perez-Sanz, A., Li, G., Gonzalez-Samperiz, P. and Harrison, S.P. 2014. Evaluation of modern and mid-Holocene seasonal precipitation of the Mediterranean and northern Africa in the CMIP5 simulations. Climate of the Past 10: 551-568.
In discussing their findings, the team of researchers report "the CMIP5 models fail to reproduce key aspects of both the modern and mid-Holocene climate of the northern Africa and Mediterranean region, including  the correct geographical location of zonal precipitation regimes in the pre-industrial simulation and  the magnitude of mid-Holocene changes in these regimes." More specifically, they say that most models  "overestimate the extent of monsoon influence and  underestimate the extent of desert." And they state that they also  "fail to reproduce the amount of precipitation in each zone," while noting that  "most models underestimate the mid-Holocene changes in annual precipitation."
When all was said and done, the four researchers were forced to acknowledge that "there are still important discrepancies between the simulated and observed magnitude of changes in precipitation, despite the increasing complexity and resolution of the CMIP5 models compared to earlier generations of models." And they state, in the concluding sentence of their paper, that "the failure to simulate observed mid-Holocene changes in the north African monsoon and the potentially linked failure to simulate the observed shift in rainfall seasonality in the Mediterranean raises concerns about the reliability of model projections of future climates in these regions."