When water vapor cools, it usually condenses into water droplets . In very cold air the water vapor condenses directly into ice crystals, and these crystals may cling together to make a snowflake.
The temperature of the cloud must be cold enough for ice crystals to form straight from water vapor. The shape of now crystals varies according to the temperature and humidity of both the air in which they form and the air through which they fall. So it is not surprising that no two crystals are alike . ‘Dry’ snow falls in cold, dry conditions . It has small crystals and blows into snowdrifts easily. ‘Wet’ snow forms when the air is moist and warm enough for the crystals to bond together
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