Easterly winds are generly not good for lessons, we want westerlys .
8 to 15 mph from the west works for the first and second beginner lessons ( it is not strong enough for the last beginner lesson, intermediate and expert lessons).
10-20 mph is good.
15-25 mph is best for most lessons.
20-30 mph is good.
25-35 mph can be intimidating for students who weigh less than 150 pounds.
Over 35 mph is appropriate only for intermediate and expert level lessons.