I'm bad using average, normal term loosely also. I think in modern time but don't limit myself thinking this is the way its always been.
Unfortunately lots of evidence we haven't seen anything yet. Hope it doesn't get this bad but current drought is nothing compared to what could/has happened.
Arizona State University Quote: Paleoclimatic evidence suggests drought in the mid-12th century far exceeded the severity, duration, and extent of subsequent droughts. The driest decade of this drought was anomalously warm, The convergence of prolonged warming and Tree ring evidence shows the southwest has endured much longer periods of drought than we currently have experienced:
Its also believed long spans of drought was the demise of the Anasazi tribes which thrived throughout the region.