Yes, Turkeys Kayseri Grey Andesite can be used for exterior applications in very rainy climates. Andesite is a type of volcanic rock that is known for its durability and resistance to weathering. It has a low absorption rate, which means it is less likely to absorb water and is therefore suitable for wet climates. However, it is important to note that proper installation and maintenance are crucial for any stone material used in exterior applications, regardless of the climate.