True wind speed is one of those mysteries for a lot of us. We put out a wind gauge at our field then asked everyone what they thought the speed was. Well, 5 is nothing like 15 but it wasn't any surprise how over estimated it really was. I watch the weather report and will still go out when it's forecast at 10 to 15 and enjoy myself. When it kicks up to the point my planes will no longer allow me to steer them back into the pits I pack it up. I have flown in some very high winds and had fun but sometimes it becomes more work then it's worth. It really is a pilots choice and how you feel about it. Different planes are a lot better in the wind then others too. I have flown trainers in wind so strong they couldn't go forward without diving. I only did that to show a young student it could be done and not to be afraid of the wind. It worked until he bought his own plane, then wind was an issue.