My understanding of the seasonal and weather adjustments is that they focus on replacing water lost via ET. For example, the watering amount is proportional to ET, and under the "seasonal adjustment" philosophy this will follow a 10 year historical trend. That makes sense if the goal is to keep vegetation about the same level of moisture. But that isn't always the best goal.

I would like to consider a more "native" seasonal adjustment (NSA). Here the philosophy is to mimic the native climate which will go through yearly cycles of wet and dry. The goal is not to always replace water lost by ET, but to smooth out variations to achieve the more native state. Obviously you don't want to do this if you want to plant tropical flowers in a desert climate. But I've tried to plant most of my yard with natives and they should roughly follow the natural watering cycles.

Does this make sense, and am I correct in my description of the current method used?