The first thing to know is that snowflakes are collections of snow crystals, which is water vapor sticking to “small particles in the atmosphere at below freezing temperatures.” It is not just frozen water. So a snowflake can be just one of these crystals or thousands of them, which is what determines the size of the snowflake. When the crystals are falling down to Earth, “the speed at which the crystals fall, the temperature, the humidity, the electrical conditions of the air” will determine how many of the crystals stick together and hence the size of the snowflake.
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