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In this essay it is proved that there are black holes that are dangerouslycold. In particular, by analyzing the emission spectra of highly charged blackholes we reveal the fact that near-extremal black holes whoseBekenstein-Hawking temperatures lie in the regime $T_{\text{BH}}\lesssimm^6_e/e^3$ may turn into horizonless naked singularities, thus violating thecosmic censorship principle, if they emit a photon with the characteristicthermal energy $\omega=O(T_{\text{BH}})$ [here $\{m_e,e\}$ are respectively theproper mass and the electric charge of the electron, the lightest chargedparticle]. We therefore raise here the conjecture that, in the yet unknownquantum theory of gravity, the temperatures of well behaved black-holespacetimes are fundamentally bounded from below by the relation$T_{\text{BH}}\gtrsim m^6_e/e^3$.

Black holes that are too cold to respect cosmic censorship