Sky Cover
Wind
clear (0/10)
Calm
1/10
1
- 2 knots (1 - 2 mph) 
scattered (2/10 or 3/10) 
3-7
knots (3-8 mph)
4/10
8-12 knots (9-14 mph)
5/10
13-17 knots (15-20 mph)
6/10
18-22 knots (21-25 mph)
broken (7/10 or 8/10)
23-27 knots (26-31 mph)
9/10
48-52 knots (55-60 mph)
overcast (10/10)
73-77
knots (84-89 mph)
sky obscured
103-107 knots (119-123 mph)