Yet, despite their widespread use, at room temperature only three elements are ferromagnetic — meaning they have high
susceptibility to becoming and remaining
magnetic in the absence of a field,
as opposed to paramagnetic substances, which are only weakly attracted to the poles of a magnet and do not retain any magnetism on their own.
In cold weather, oxygen migrates toward Earth's
magnetic poles and gains paramagnetic
susceptibility as the temperature decreases.