What does this question mean?
Que haces cuando hace buen tiempo?
3 Answers
What do you do when the weather's good?
"When is it good weather?"
I'm taking a stab at this. Someone who knows more will have to say if I'm in the ballpark.
The machine translators don't do very well with your question (as typed) but if you supply the opening question mark and the proper tilde for "qué", all three translators produce satisfactory results.
So much for the virtue of using proper spelling and punctuation.
P.S. You should have written "¿Qué haces cuando hace buen tiempo?"