Winter crossword puzzle

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Across
  1. 4. Winter sport on a board
  2. 7. Clears snowy roads
  3. 9. Source of warmth indoors
  4. 12. Month when winter begins
Down
  1. 1. Unique ice crystal
  2. 2. Cold-weather creation
  3. 3. Famous snowman
  4. 5. Warm drink
  5. 6. Severe snowstorm
  6. 8. Hanging ice formation
  7. 10. Winter activity
  8. 11. Santa's mode of transport