In any given high desert area there can be wildly varying climates within a 30 mile radius. Mountains deflect winds and affect weather systems. Solar radiation scalds leaves in higher terrain.
A microclimate is an area of weather conditions differing from the prevailing conditions due to terrain, water features, plant life, or manmade structures. Once you realize how these things can modify weather in your yard you can create ways of protecting your flowers, vegetables and trees from climate extremes.
This full color book goes into detail on global climatic norms and how a high desert environment differs from standard. It discusses how to observe the climates and microclimates of your living environment and offers advice on creating conditions more beneficial to whatever kind of plant life you would like to foster in your vegetable or flower gardens.