How does the precipitation in Oklahoma change as you travel across the state?

Answer: it decreases from East to West.

Explanation:

The main feature of precipitation in Oklahoma is that rainfall decreases from East to West. The average annual precipitation is about 17 inches in the far western panhandle to about 56 inches in the far southeast. The frequency of precipitation varies from 45 days per year in western Oklahoma to 115 near the Arkansas border. Annual snowfall increases from less than two inches in the extreme southeast to nearly 30 inches in the western panhandle.

The Ouachita Mountains cover most of southwest Oklahoma