In this study, 2×100×200 mm wood veneers obtained from Scots pine (Pinus sylvestris L.), European black pine (Pinus nigra Arn.) and beech (Fagus orientalis L.) wood were exposed to outdoor climate conditions at three different cities (Trabzon, Artvin, and Kastamonu) of Black Sea region in Turkey for totally 4 months from May to August, 2012. The aim of this study was to investigate the effect of climate factors on the changes occurred on different types of wood veneers that were subjected to outdoor weathering conditions. Weight losses, surface roughness, and color changes occurred on veneers were determined during natural weathering. Additionally, the weathering map of wood in three cities studied was calculated using Scheffer Climate Index (SCI) in order to characterize the potential decay risk of wood materials. Accordingly, at the end of the 4 months, the highest weight losses for Scots pine veneers were obtained from the weathering conditions in Artvin while the lowest weight losses were obtained in Kastamonu. For European black pine and beech veneers, the highest weight losses were obtained from Trabzon, and the lowest weight losses were obtained from Kastamonu. The highest color change value (?E*) obtained from Trabzon and Artvin, the lowest ?E* obtained from Kastamonu for Scots pine veneers. For European black pine veneers, the highest ?E* obtained from Trabzon while the lowest ?E* was obtained from Artvin and Kastamonu. For beech veneers, the highest ?E* was obtained from Artvin, the lowest ?E* obtained from Kastamonu. For all veneers, the lowest surface roughness was determined in Trabzon. The highest surface roughness was obtained in Artvin for Scots pine and it was obtained in Kastamonu for European black pine and beech. Based on the result of SCI analysis, the most risky city for decay potential of fungi was Trabzon, then Artvin and Kastamonu, respectively
