I believe I asked this same question a few years back when I was fishing out of my tin. Back then, I definitely had a max wind thresh hold...and it was about 10 - 15 MPH...depending on the direction it was coming from. On the Harris Chain there are a few oblong / tall shaped lakes where an E or W wind is not bad but a N or S wind will kill you and vice versa.
Just pay attention to the wind forecast, and try to plan accordingly. I usually also adjust my techniques based on the wind too...so it's a huge factor.
Nowadays, the wind doesn't bother me too much. Won my first tournament in 25-30 MPH gusts in January...was pretty tough, but it can be done.