 The cities of Yakima and Prosser are the main commercial centers with many wineries located in or around them.To the west, Mount Adams dominates the landscape along with the Yakima River on its eastward flow to the Columbia River.Overall, the temperature of the Yakima Valley is more temperate than the rest of the greater Columbia Valley AVA, with average temperatures being 5 °F (3 °C) to 10 °F (6 °C) cooler.