The world's largest recorded snowflake was 15 inches wide - Apparently.
On January 28, 1887, at Fort Keogh, Montana, a rancher named Jonas Miller measured a massive snowflake that was 15 inches wide and 8 inches thick. This extraordinary flake was part of a massive blizzard that dumped 4 feet of snow on the area in just 24 hours. The measurement was recorded by the US Army Signal Corps and remains the largest snowflake ever recorded by a credible source. This astonishing fact is verified by historical weather records and has been recognized by the Guinness World Records.