Let's review

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Across
  1. 4. - we have got it in winter
  2. 6. - the eighth month of the year
  3. 7. - the second month of the year
  4. 8. - +38
  5. 10. - -25
  6. 12. - -5
Down
  1. 1. - the first day of the week
  2. 2. - it comes after autumn
  3. 3. - the first weekend day
  4. 5. - it goes before sixteen
  5. 9. - the last weekday
  6. 11. - +16