Light Grey Cast Stone can generally be used for exterior applications in windy climates. Cast stone is a durable material that can withstand various weather conditions, including wind. However, it is important to consider a few factors before using it in such conditions:

1. Thickness and strength: Ensure that the cast stone used is thick and strong enough to withstand the high winds in your specific climate. Thicker and stronger cast stone will be more resistant to wind damage.

2. Installation method: Proper installation is crucial in windy climates. Ensure that the cast stone is securely anchored to the structure using appropriate fasteners and reinforcement methods to prevent it from being dislodged or damaged by strong winds.

3. Sealing and maintenance: Regularly inspect and maintain the cast stone to ensure there are no cracks or damages that may be exacerbated by wind. Additionally, consider using a suitable sealant to protect the cast stone from moisture penetration, which can cause further damage in windy and wet climates.

By considering these factors and taking appropriate measures, Light Grey Cast Stone can be used effectively in exterior applications in very windy climates. However, it is advisable to consult with a professional or manufacturer for specific recommendations based on your climate conditions and the specific project.