Not to mention your land quality and excellent moisture.
I'm pretty sure we could not handle very much more than our average annual precip. of around 15 inches, as a few years we got around 20 inches and grass grew too rank, low places which normally produce well, went to more dominant, less desireable species, some even killing the grasses and forbs. Lots of alkali comes out when we have either too much or too little rain, it seems.
Our soils generally are not very deep, either. Something about this once being an inland sea, I guess.
We are pretty well blessed to get a few good years when things grow well.
mrj