To make a fictional planet's various regions more accurate in terms of climate, foliage etc, does anyone know of any software that would be usable to model the global climate zones? The software would need to allow adjusting the size of the planet, rotation speed and of course the map itself and other crucial factors. Slower rotation would mean much longer days and hence a more variable temperature (hotter afternoons and colder nights) as well as stronger winds along coastlines and potentially fewer convection zones which have a huge impact on prevailing winds and hence rainfall in each region. The size of the planet also has a large effect obviously. I'm trying to make the planet as authentic as possible.