Charcoal cast stone is generally suitable for use in exterior applications in windy climates. Cast stone is a durable and weather-resistant material that can withstand harsh weather conditions, including wind. However, it is essential to ensure that the installation of the cast stone is done correctly and securely to prevent any potential damage or displacement due to strong wind forces. Additionally, it is always advisable to consult with professionals or manufacturers for specific recommendations regarding the installation and suitability of cast stone for your specific project and location.