Create your own snowflakes from sugar. Twist three pipe cleaners together so that their ends are sticking straight out, forming a sort of web shape. Tie a string around one of the pipe cleaners and tie the other end of the string to the center of a pencil. Fill a jar with boiling water and add sugar to the water. Stir the water and continue adding sugar until the sugar no longer dissolves in the water. Place the web of pipe cleaners into the jar so that they dangle just above the solution and set the pencil on top of the opening of the jar to keep the pipe cleaners in place. Over a period of time, crystals will begin to form on the pipe cleaners, transforming them so that they resemble snowflakes.
Use a microscope to get a closer look at snowflakes. Place a few microscope slides in the freezer to cool them and when the snow starts falling, spray some hairspray on the slides to catch some snowflakes on them. Set the slides aside to allow the water in the snowflakes to melt; as the water melts, the shape of the flakes will be preserved in the hairspray on the slides. Set the slides under a microscope and you will actually be able to see how no two snowflakes are alike.
When the forecast calls for snow, set a black garbage bag outside to cool it. When the snow starts falling, head outside with a magnifying glass and observe the snowflakes that are collected on the garbage bag. Compare the similarities and differences between the snowflakes. Discuss the different shapes and sizes of the flakes.
Gather a collection of snowflakes to observe how the tiny flakes create piles of snow. Set a clear jar in the freezer to cool it and set it outside in an unobstructed area where snowflakes can be easily collected inside. Shine a flashlight on the jar to observe the pile of snow that has been collected inside. Use a magnifying glass to get a closer look at the pile of snow and you'll be able to observe how the pile is a collection of several snowflakes.