This is a daylight chart. The hours of daylight can be known to justify the building of such a facility. All that is necessary to understand the feasibility of a solar collector such as the solar trough is to plug in a longitude and latitude and obtain the length of daylight.
As a rule, ie: Bakersfield, California, there are no clouds in a desert otherwise it would not be a desert.
Deserts usually have very low rainfall under NORMAL circumstances and considering Earth is become a prune in this manmade troposphere the justification of such a facility is long overdue!