No Two Snowflakes are Alike

Contrary to popular belief, there are some circumstances that can result in matching snow flakes. The size and shape of a snowflake mostly relies on the temperatures at which it freezes. Larger, more complex snowflakes that form at lower temperatures will vary in design. It is incredibly rare that you'd find two large snowflakes that look exactly alike, as their molecules will have frozen in a sudden and unique pattern.

However, there have been instances of smaller flakes formed at higher temperatures that appear indistinguishable, even under a microscope. They tend to be significantly less complex and generally form in the same basic shape.

More Weather Glossary

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This Day In Weather History

Newbury, VT (1843)
12 inches of snow.

East Coast, USA (1878)
"Gale of '78;" hurricane center over Richmond, VA. Washington, DC. barometer reading of 28.78"/975 mb. Cape May had winds of 84 mph from the SE. Highest tide ever for the Delaware River. Winds 100 mph at Wilmington, DE. Severe damage in Philadelphia.

Off British Columbia Coast (1918)
The Princess Sophia struck a coastal reef in severe storm and sank. All 343 aboard drowned.