"For Mid-Atlantic snowmakers, two factors have a profound influence on the process: temperature and relative humidity. People often look at their Eddie Bauer thermometers on their ski jackets and say, “Hey, it’s below 32 degrees, why aren’t the snow guns cranking?” The answer is humidity. In general, the more humid the air, the lower the temperatures have to be to be for snowmaking." (
http://www.dcski.com/articles/view_article.php?article_id=364&mode=search)
you can still pretend i'm wrong and dont know what i'm talking about.. believe me... i made my own snow gun... i know how things work