Here’s a cohesive color palette that captures the essence of subdued, modern, earthy, beachy, and windy themes, optimized for data visualization and dashboards. The colors are visually distinct, color-blind friendly, and medium-valued.

 <Earthy Beach>
1. Dusty Teal - 
          
          #4B8B8C
        - A muted teal that embodies the calming essence of the beach and the earthy tones of nature.
2. Sandy Beige - 
          
          #C6B29A
        - A soft, sandy beige that reflects beach sand, creating a warm and inviting feel.
3. Olive Green - 
          
          #7D8B4B
        - An earthy olive green that represents natural elements and integrates well with other colors.
4. Coral Pink - 
          
          #E69A8A
        - A subdued coral that adds a touch of warmth and modernity, reminiscent of beach sunsets.
5. Slate Blue - 
          
          #5B7F9A
        - A cool, muted blue that evokes the feeling of a breezy coastal day.
6. Moss Green - 
          
          #5B8A6A
        - A deeper, earthy green that provides a grounding element to the palette.
7. Driftwood Gray - 
          
          #AFAFAF
        - A soft gray that adds a modern touch, reminiscent of weathered driftwood.
8. Seafoam Green - 
          
          #A1C6B9
        - A light, airy green that reflects the essence of seafoam and complements the other colors beautifully.

This palette strikes a balance between earthy and beachy tones, ensuring clarity and distinction in data visualization.

What type of data visualization or dashboard are you planning to use this palette for? Would you like me to suggest specific uses for each color?