Yes, Finlands Amadeus Granite can be used for exterior applications in very rainy climates. Granite is a durable natural stone that is resistant to moisture and does not easily absorb water. It is often used for outdoor applications such as paving, cladding, and landscaping due to its ability to withstand various weather conditions, including rain. However, it is advisable to seal the granite periodically to enhance its water resistance and protect it against any potential staining or damage.