Lincoln County climate is hot/dry in the summer, cold/moderately humid in the winter. Due to the relatively level terrain (about 1,200 feet difference from lowest to highest elevations), temperatures tend to vary little from east to west. Precipitation varies from an arid condition in the western part of the county to semi-arid in the northeast. The entire area lies in the dry intermontane basin between the Cascades and the Rocky Mountain System. Precipitation (10-20 inches annual rainfall) is a major controlling factor in agriculture. Precipitation in the Big Bend region is highly variable; from 8 inches in the west to 20 inches in the northeast.