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'Snow grains' are a form of precipitation characterized as:

★ white, opaque grains of ice

★ very small <1 mm,

★ fairly flat or enlongated,

★ unlike Snow pellets they don't bounce or breakup on impact,

★ very small amounts fall, mostly from Stratus or Fog,

★ 'Never' in the form of a shower.
The METAR code for snow grains is 'SG'.