We have a cellar which stays cool all year long, including hot summers. However, I have always understood that just as important as temperature is good ventilation and moving, not still, air. The ideal would be to live up a mountain with deep, cool caves through which the wind blows all the time, as it does in the Parma region of Italy, hence the reason they make hams there. When we remember to get them out, we sometimes hang them outside from tree branches in the depths of winter, inside a large, six sided wire mesh cage to prevent squirrels or mice getting in, not that they have ever shown any interest in trying, and a gale resistant, plastic sheet attached to the flat top to prevent them getting soaked, although rainy weather is not ideal as too much of it comes in sideways. Much better is the drier, bitterly cold, north easterly wind sort of weather. Tamsaddle