It'd depend on humidity, if sunny or cloudy, etc. It also depends on you, and what temperatures you're used to! I'd personally say about 70 *F, but I don't know what temps you're used to! For some people, 70 is heavy-jacket weather, while for me it's short-shorts and t-shirt!
the situation which would be least likely for a scientist to revise our experimental method would be if results are the same after defeating the procedure.
