Snow crystals are almost perfectly symmetrical, although most are irregular in many respects. The rule by which the six arms of a crystal assume an identical shape is not known, and at the same time none of the crystals are identical. It is known to be affected by changes in temperature and humidity as the crystals move inside the could. The greatest complexity of snow crystals is observed when humidity is high. When the temperature is low, the ice crystals are smaller, and have a simpler structure and there are fewer of them (the so-called snow grit) - at temperatures below zero, the snow cover is smaller.
If the air temperature is close to freezing, the individual ice crystals stick together with the help of small water droplets and form cotton ball-like snowflakes.
