Anytime someone says hot dry summer and potatoes it brings to mind earliness.
Unless you have rain or good watering venues, I would go with the earliest maturing types to escape the yield and quality devastations that occur with stress during the heat wave that you may yet experience again.
Earlies are potato varieties such as Cobbler and Norland. Any variety that compare with those would be a good choice. Depending on where you get your seed potatoes, you might investigate which are comparable in maturity. My experience in Kansas proved that early is a must when high heat and no rainfall hurts the late maturity classes.
Tom
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