The phenomenon by which you "see your breath" is a form of
condensation. Condensation is the process in which a gas transforms into a liquid.
When you "see your breath" the moisture (gaseous form) in your breath has condensed and
become little droplets of water.
The conditions in which
this can happen are affected by a number of factors. Please see the weather.com link
below for a very good discussion of the impact of the various factors -- it is below the
weather map, so please scroll down. There, you can see that the possibility of seeing
your breath depends on such things as the temperature of the outside air, its relative
humidity, the temperature of your breath and its relative
humidity.
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