The most obvious answer is that the vapor will condense rapidly, even possibly before your eyes. By condense, I mean that the vapor will quickly turn into a liquid state.
It will then freeze into a solid state (ice).
It will become frost.
Water freezing in bottle when opened happens in the case of supercooled water. This water has been cooled below freezing point without being crystallized.
super-cooled liquid
supercooled
When a gas cools the distance between the particles shrinks, if a gas is cooled to a temperature below its boiling/Condensing point it condenses into a liquid, if it is cooled bellow its Melting/freezing point it because a solid A common example of this is water which above the temperature 100 is a gas, between 0 and 100 is a liquid and below 0 is a solid.
it freezes
Firstly, when sodium acetate (CH3COONa) solidifies, it does not form "ice". It just becomes solid. This happens when the sodium acetate is heated to about 100oC, then cooled below its freezing point. When a foreign substance with the same crystal structure as sodium acetate is introduced, or a nucleation centre is provided, the sodium acetate will warm up to its freezing point and freeze at its (supposed to be) freezing point.
flash freezing works when water is cooled below its freezing point to form supercooled water. when ice is added ice crystals instantly form around the ice to create a flash freeze
Salt will reduce the freezing point of water to below 32ºF, thus making it less likely to have slippery roads when temperatures are near the freezing point. This happens because of the colligative property of freezing point depression.
When unsaturated vapour is cooled down under freezing point
Bromine is a liquid at room temperature. Cooled below its freezing point, bromine would probably be a brittle crystalline solid much like iodine.
temperature below freezing point of water.
It is possible to keep water as liquid below its freezing point - see related link.