I do not have access to the complete technical specifications of BlueStone material. However, typically natural stone materials like BlueStone can be used for exterior applications in hot climates as they are durable and heat-resistant. However, it is always wise to check with the manufacturer or a stone expert to ensure that the material is suitable for your specific project and climate. Factors such as the amount of direct sunlight and exposure to extreme temperatures can impact the longevity and appearance of the stone.