I usually do not fly if winds exceed 20 mph. It is not that much fun and very seldom is anyone at the field. I sometimes will fly my Ultra Sport 60, Kougar, or Dazzler in high winds because I'm so bored and there is simply nothing else to do. I like building but my basement is still stuffed with planes even after and I sold 4 RC planes over the past month. Right now in St Louis wind is not a factor however the 94 F + temperatures are.