Winter puzzle

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Across
  1. 4. Warm and comfortable
  2. 5. Source of indoor warmth
  3. 8. Special days in December
  4. 11. Ice crystals on surfaces
  5. 12. Low temperature
  6. 13. A single piece of falling snow
  7. 16. To sleep through winter
  8. 18. Clothing worn around the neck
Down
  1. 1. Used to stay warm
  2. 2. Warm chocolate drink
  3. 3. Warm liquid food
  4. 6. Decorations often used in winter
  5. 7. Frozen precipitation
  6. 9. Frozen water
  7. 10. A severe snowstorm
  8. 14. Cold season of the year
  9. 15. Time when it is dark
  10. 17. To relax or take a break