These climates are dry because of extreme continentality and the effect of high elevations. Being located at the center of a continent limits the amount of moisture supplied from ocean sources. Without this moisture precipitation can not occur. The presence of mountains upwind of these climates can further reduce moisture availability because of the rainshadow effect . Major expanses of mid-latitude deserts can be found east of the Caspian Sea, north of the Himalayas, in western United States, and east of the Andes in a narrow region in southern South America. Mid-latitude deserts have a greater range of both daily and annual temperatures than their subtropical counterparts. In most cases, summer temperatures are not as high in mid-latitude deserts when compared to subtropical deserts. There are, however, exceptions like Death Valley, California which is one of the hottest places on our planet. Winter temperatures tend to be quite cool.