I looked but I didn't see this one yet.

For a trainer, with a relatively inexperienced pilot, what is the highest wind speed that is safe to fly in?
For a sport or scale plane, with an experienced pilot, what is the highest wind speed that is safe to fly in?

Is it ok to fly in a misty conditions? Will it kill the engine?

Basically what are the optimal condtions for flying and what are the limits.

Say for instance I want to fly in someone's pasture or hay field, how big an area should it be to be safe?