Tamriel is a place with many different types of land forms. It is so large that it contains harsh deserts, dense, lush forests, and even bitter, frigid tundras, all in the same landmass. In the northern provinces, the climate tends to be cold and icy, with the exception of Morrowind-- it is a land of ash clouds and molten magma. The central and eastern/western provinces tend to be milder in climate, with the exception of Hammerfell-- it contains a vast desert known as the Alik'r desert. The southwestern provinces typically have a tropical climate- not too hot nor cold. The southeastern province of Black Marsh, a land of swamps and marshes, has a hot, humid climate. It's safe to say that the many different provinces of Tamriel are extremely diverse concerning climate.