Cloud Grey Glass can be used in exterior applications in very humid climates. However, it is important to consider the specific conditions and requirements of the project. Cloud Grey Glass is commonly used for various exterior applications such as curtain walls, windows, and facades. Its durability and resistance to weathering make it suitable for humid climates. However, proper installation and maintenance are essential to ensure its long-term performance. It is advisable to consult with a professional or glass supplier knowledgeable in exterior applications to determine the most suitable glass type for your specific project and climate conditions.