Re: Can it get too cold to snow?

While air temperature can affect the size and shape of snow crystals that 
form, snow can occur at any temperature below the freezing point of water.  
It is apparent that heavy snowfalls occur when there are warmer air 
temperatures near the ground, and colder air results in different snow 
crystal shapes, but it can never be too cold out to snow.  Check out this 
website for some cool pictures of snowflakes;
 http://www.usatoday.
com/weather/wsnocrys.htm


As for your question about catching a cold; there is no connection between 
weather or air temperature and catching a cold.  The National Institute of 
Allergy and Infectious Diseases says that there is no connection between 
exercise, diet or weather conditions. However, psychological stress, 
allergic disorders affecting the throat, and menstrual cycles may have an 
influence on whether or not you catch a cold.  There is some evidence to 
suggest that the reason we tend to get sick more in the winter is because 
we spend more time inside, around other people, breathing the same air as 
them.  Many cold viruses are airborne, and being in closer quarters with 
people in stale air conditions may increase the chances of catching 
somebody else's cold.  For more information on the common cold, check out 
the NIAID website; 
 http://www.niaid
.nih.gov/factsheets/cold.htm