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The aim of this work is to investigate the effect of extreme high ambient air temperature on the performance of a wind farm operating in Algeria Saharan area. The analysis is carried out using in-situ field-data and the Wind Atlas Analysis and Application Program (WAsP). The predicted annual energy production is compared to the actual performance of the wind farm. Then the influence of the air density variation on the AEP prediction is evaluated. It is shown that the error on predicted AEP is reduced when one take into account the monthly variation of the air density. [ABSTRACT FROM AUTHOR]