That is a very informative link, esshup.
I wish every state had that resource.
As expected, the evaporation in July and August is really the only brutal interval. If your pond can make it through that period with an acceptable minimum water level, then you are probably good - for most years.
The water well might be worth it, if your pond populations will suffer significant damage during either a very severe drought, or a more moderate, but multi-year drought.
Of course, if money is not a significant issue, then keeping the lake at a near constant water level to keep your fish habitat at the preferred depth, the water line at the swimming beach at the optimal mark, the ease of loading a boat from a fixed dock, etc. then the supplemental well and pump are good solutions for that, even if they do run slightly behind your water requirements in July and August.
