Data centres don't need the cryogenic temperatures they once did. 30C/85F is a common operating temperature for server these days.
And evaporative cooling of data centres is quite common now. In locations with consistently low humidity, you can avoid the energy and expense of compression cycle cooling and use just a fraction as much power during the hottest parts of the hottest days... the rest of the time (at night, in autumn, winter etc) they can easily use outside air without adding water.
Facebook's data centre tour is a good explanation of the technologies going into data centres these days: