Romanias Gri Petrol Basalt can typically be used for exterior applications in very rainy climates. Basalt is known for its durability and ability to withstand harsh weather conditions, including rain. It is resistant to moisture and has low water absorption rates, making it suitable for areas with high rainfall. Additionally, basalt is less prone to cracking or fracturing due to freeze-thaw cycles compared to other natural stones. However, the specific conditions of the site and the type of installation should be taken into account, so consulting with professionals and considering proper sealing and maintenance is recommended for optimal performance in rainy climates.