What are the normal work conditions (excludingthing likes weather and other changing variables)?

This is a bit vague. Do you meant "for any job"? Or something else?

If I'm interpreting this question correctly, you're asking about work conditions for carpenters. The thing you have to know is that carpentry covers everything from large construction projects to cabinetry to custom artwork. Because of that, the work conditions range from begin outside putting huge structure together to making fine artwork in wood indoors. And in the near future, computer aided design and manufacturing and rapid prototyping will get more and more pervasive. Very soon, you won't be able to avoid using computers and a whole host of automated manufacturing techniques. But while you can likely get a job as an unskilled laborer and then work your way up, I'd recommend taking advantage of training programs. The biggest mistake I see many young people make is thinking that "book learning" and being a college student are the only ways to go. One thing we must never lose is the ability to apply our knowledge and theories. The artisans of the past knew this, and would require people to be apprentices first. And the greatest craftsmen -- artists, carpenters, mechanics, electricians, plumbers, engineers and, I think, the best scientists and general problem solvers go in and get their "hands dirty". I have a dentist who is, as far as I can tell, the best I've ever had. His secret? He knows how to do bodywork on cars. Craft is craft. It's what makes humans tick.