In winter we can still find beautiful moments taking place around us. One of these beautiful moments is a snowflake! Its common knowledge that each snowflake is unique, but a single snowflake can tell us a lot about what is happening in the atmosphere around and above us. Why are some snowflakes smaller than others? Why does snow sometimes fall when it’s above freezing?
Snow needs moisture and humidity to form, so very dry places will not accumulate snow even if it is below freezing. This includes areas of Antarctica. Since warmer air holds more moisture, it tends to be less humid the further the temperature falls below freezing. Snow is formed simply by the combination of ice crystals in the atmosphere combining until they become so heavy that they fall to the Earth.