In three areas under Mediterranean climate: two in North eastern Algeria (Tiffech and Sidi Fredj) and one in France (Montpellier), we conducted our study on some Durum wheat (Triticum durum) genotypes. The effect climatic conditions of said areas had on the performance of these genotypes was noted through changes in their morphological characteristics: average stem height, distance between the spreading leaf and the ear, ear length and awns length). The results obtained show significant interactions between the genotypes studied and the climatic parameters of the experimental sites. A positive correlation between stem height average and distance flag leaf-spike was recorded in all three study areas. Climatic conditions in each area affected spike length and awn length differently. In Sidi-Fredj, climatic conditions stimulated the development of the awns of majority of the cultivars studied compared to the other experimental sites. This conditioning can be interpreted as an adaptation mechanism of durum wheat genotypes to environmental stress.