How often do Amsterdam canals freeze?

Related questions

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5. Is it cold in Amsterdam in December?
6. What is the hottest month in Amsterdam?
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Tags

1. #climate
2. #current
3. #nights
4. #skating
5. #heated
6. #happens
7. #canals
8. #especially
9. #least
10. #change
11. #people
12. #every
13. #years
14. #frost
15. #combustion
16. #times
17. #maybe
18. #amsterdam
19. #rarely