Do you know where the dry land of the earth came from? From Snow!
G-d took it and threw it upon the water, the water then froze, and the dust of the earth was formed. As the verse states (Job 37:6) "To snow, G-d said: Become land!"
The Maharal of Prague describes snow as being an illuminating force that is tantamount to Spiritual Light. This is why G-d made the earth from snow, because people on earth need to be reminded of G-d's involvement in man's affairs.
By creating the earth from snow, G-d has placed a spiritual force that is present at all times in the earth, enabling us to actualize this spirituality. And by causing snow to fall at certain times, G-d sends us a reminder to actualize this spirituality.
This is why G-d makes snow in the winter. In the winter we do not experience biblical holidays, a low point of spiritual inspiration. G-d, therefore, sends us snow; contemplating snow's profound meaning helps us feel connected to Him once again.
Snow descends and covers the ground as if to shout, "Remember that it is G-d that is constantly “covering” the ground and providing everything in our life. Draw closer to Him!"
So when it snows, instead of being upset that we are going to be late for work, be reminded of the deeper truths of this world. It is wintertime, time to connect to G-d, as reflected in the pure, white snow.