Yes, Frances Bourgogne Boise Limestone can be used in exterior applications in hot climates. Limestone is a durable and natural stone that has been used for centuries in construction. It is well-suited for outdoor use, including in hot climates, due to its ability to withstand high temperatures and exposure to sunlight. However, it is important to note that proper installation and maintenance are key to ensuring the longevity and performance of any natural stone in outdoor applications.