<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Hail is a form of solid precipitation . It is distinct from ice pellets (American sleet), though the two are often confused . It consists of balls or irregular lumps of ice, each of which is called a hailstone . Ice pellets (American sleet) falls generally in cold weather while hail growth is greatly inhibited during cold surface temperatures . </P> <P> Unlike other forms of water ice such as graupel, which is made of rime, and ice pellets, which are smaller and translucent, hailstones usually measure between 5 millimetres (0.2 in) and 15 centimetres (6 in) in diameter . The METAR reporting code for hail 5 mm (0.20 in) or greater is GR, while smaller hailstones and graupel are coded GS . </P>

Does it have to be cold for hail