Maximum Snowflake Size
Name: Mary K.
How big can a snowflake be?
If you are speaking of a single snow crystal,
they normally do not get larger than about
half an inch in diameter. Snowflakes can be
either single crystals or an agglomeration
of crystals (many broken). Agglomerations
can often be three inches in diameter and
supposedly they can, rarely, be up to 10 inches
David R. Cook
Atmospheric Research Section
Environmental Research Division
Argonne National Laboratory
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Update: June 2012