Yes, Stars Moonlight Terrazzo can be used for exterior applications in very humid climates. Terrazzo is a durable and moisture-resistant material, making it suitable for outdoor use in high humidity environments. However, it is important to ensure that the installation and sealing process is done correctly to prevent moisture penetration and potential damage. Consulting with a professional installer or manufacturer is recommended to ensure the terrazzo is suitable for the specific climate and to receive proper installation guidelines.