You don't give much indication of your wind area.
An average wind speed of 10mph is rather high, 10mph average is way worse but still not bad compared with what we have here.
If you mean instantaneous speed of 10 to 15mph that is a different issue.
Most modern permanent magnet machines will perform well in a 15mph wind. not all commercial iron cored machines will perform that well at 10 mph ( some I won't mention won't do anything at 10 mph).
A well designed axial with no iron should be able to cover the 7 to 15mph wind speed with good efficiency but outside that speed range you start to have to trade off high wind or low wind on a simple single design. If you go to low cut in you will start to loose out in the 18 mph plus region.
Probably with home build and direct connection to a battery you can achieve a Cp of about 0.3 in the 10 - 12 mph region and it will fall on either side. Few commercial machines will exceed this even if they claim to do so. Most will probably exceed the performance of a home build in the higher wind speed region as the makers need impressive high wind figures to sell the machine and they don't concentrate too much on the few watts at 7 mph that doesn't sell machines.
As Dan said, you need big machines to get power in low wind and if your low wind is caused by turbulence then wind may not even be worth trying.
Flux