Seasons and the months of the year

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Across
  1. 2. 8th month
  2. 4. 6th month
  3. 7. december/january/february
  4. 8. 3rd month
  5. 9. 11th month
  6. 11. kalt
  7. 12. 5th month
  8. 15. 9th month
  9. 16. 1st month
  10. 19. 4th month
Down
  1. 1. june/july/august
  2. 3. march/april/mai/
  3. 5. 12th month
  4. 6. 10th month
  5. 7. warm
  6. 10. geburtstag
  7. 13. september/october/november
  8. 14. 2nd month
  9. 17. Jahr
  10. 18. 7th month