In most DC build outs you're looking for favorable network peering (ie pipe size, latency, or both) and low electricity costs.
If peering is the highest priority, then you build in hot climates and reduce your cooling costs as much as possible with outside air when temperatures are cool (is at night). They've been doing this in Las Vegas for decades.
To add to this: University of Texas' supercomputers have used a variation of this for a while. I don't recall which cluster was the first, but they chilled and stored water at night when electricity was cheaper, then circulated the water during the day. This substantially cut cooling costs and increased cooling efficiency.
Then they wouldn't need nearly as much artificial cooling.
I don't think they are going to do it in the hottest part of Texas, or the part that doesn't cool off fairly early most nights.
I know I could do it without any artificial cooling at all, and not far from Houston which is hotter than Austin and lots more humid too.
All I need is a couple spare ranches somewhere between the two cities :)