The World record for the largest observed snowflake …
according to the Guinness Book of World Records, was attained this day of January 28th in 1887. The city was Fort Keogh, Montana and the observer was a farmer.
Google’s doodle of today celebrates his discovery, though it appears he may have been the only witness to this frozen snowflake miracle of nature.
From Wikipedia we learn that Guinness’ recognized the world’s largest snowflakes as those of January 1887 at Fort Keogh, Montana; allegedly one measured 38 cm (15 inches) wide.