  Spherically symmetric magnetic and dyonic black holes with a magnetic charge
$Q=2$ are studied in the Standard Model and general relativity. A magnetically
charged black hole with mass below $9.3\times 10^{35}$ GeV has a "hairy" cloud
of electroweak gauge and Higgs fields outside the event horizon with $1/m_W$ in
size. An extremal magnetic black hole has a hair mass of 3.6 TeV, while an
extremal dyonic black hole has an additional mass of $q^2 \times 1.6$ GeV for a
small electric charge $q \ll 2\pi/e^2$. A hairy dyonic black hole with an
integer charge is not stable and can decay into a magnetic one plus charged
fermions. On the other hand, a hairy magnetic black hole can evolve via Hawking
radiation into a nearly extremal one that is cosmologically stable and an
interesting object to be searched for.
