Snow is white because visible sunlight is white. The crystals in a snowflake reflect white light off each other and what little light that is absorbed gives snow its white appearance.
It is never too cold to snow since moisture can exist in the air even at the lowest temperatures. However, most snowfalls occur when the air is -9 C or warmer, since air can hold more water vapour during warmer temperatures.
Snow is edible , at least in theory. Snow that falls in large urban centres may contain pollutants that should not be ingested, especially when these are present in high concentrations.
Snow makes things quieter because the air pockets in fresh snow absorb and trap sound waves. But ambient noise returns when surface snow hardens and begins to reflect more sound. In places where there is really hard snow, the icy surface will actually cause noise to travel farther.
Snow crunches when you step on it because snow is composed of ice grains surrounding tiny air pockets. Each layer of snow is largely of empty space. When you take a step on the surface, you are compressing layers and causing ice grains to compress. The colder the temperature, the louder the crunch because the ice grains are harder and less likely to melt during compression.
Icicles are more common on the south side of buildings because that exposure tends to receive more daytime sun. Snow is more likely to melt on the south side of a building. It then re-freezes during the night to form icicles.
Source - CBC News
