[eru]

> In order to have a higher temperature than the CMB a black hole would have to be really small with a mass about half of that of the moon.

Either that, or you just wait a couple eternities for the CMB to cool down enough.

[sandworm101]

Or you make a smaller one and watch it shrink. It is theoretically possible to construct a smaller black hole by cramming the necessary mass/energy into a small enough space. (Plug a death star into the LHC's big brother.) Such a hole would be very hot and short-lived.

[morebortplates]

Or primordial black holes with such a small mass actually do exist, who knows...