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A black hole of one solar mass (M☉) has a temperature of only 60 nanokelvin (60 billionths of a kelvin); in fact, such a black hole would absorb far more cosmic microwave background radiation than it emits. A black hole of 4.5 × 1022 kg (about the mass of the Moon, or about 13 micrometers across) would be in equilibrium at 2.7 kelvin, absorbing as much radiation as it emits.
Presumably a shrinking black hole would explode when its mass fell to the Planck limit 22 micrograms about one hundredth thousandth the energy of the Hiroshima bomb nothing like Hydrogen bomb levels
The final stage of the evaporation of a black hole would proceed so rapidly that it would end in a tremendous explosion...an energy equivalent to about 10 million one-megaton hydrogen bombs.