Are vacuums cold?

Vacuum means lack of pressure - not lack of temperature. ... Even though a vacuum has no moving particles to generate heat doesn't mean there is no heat. It simply means there is no vehicle (no molecules) to transmit heat via conduction or convection. However, there could still be heat transmitted by radiation.Mar 8, 2011 read more

Now sticking your hand in a complete vacuum which is devoid of any matter or radiation - would indeed be quite cold. The rate at which your body heat would dissipate into this cold would be rather high because the rate of energy transfer is dependent on the temperature delta. read more

When space is said to be cold, it does not always mean its temperature is low; it may not have temperature if the radiation present is not equilibrium radiation (which never is exactly; the radiation is influenced by the solar system objects - Sun, Earth, solar wind etc.). read more