Is the Wise Owl Wise?

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Across
  1. 5. / the degree of heat present in an object
  2. 10. / express regret for something someone has done wrong
  3. 11. / the coldest season of the year
  4. 12. / clever
  5. 15. / active at night
Down
  1. 1. / the warmest season of the year
  2. 2. / season when leaves fall off the trees
  3. 3. / spend winter in a dormant state
  4. 4. / an agile rodent with a bushy tail, usually feeding on nuts and seeds
  5. 6. / very frightened
  6. 7. / a hard solid non-metallic matter of which rock is made
  7. 8. / a nocturnal animal of the weasel family, usually having a grey and black coat
  8. 9. / the season in which vegetation begins to appear
  9. 11. / crying of pain, grief or anger
  10. 13. / a mammal of the dog family with a pointed muzzle and a bushy tail
  11. 14. / continue to live despite of danger or hardship