Hi Albin,
May I suggest that you should have your own, in home hygrometer so you know what the humidity is in your home, not just outside. They are not terribly expensive. Check Amazon or similar... Most people believe that guitars are safe from 40-60% RH, but I have found that even 35% is acceptable -- at least I have no cracks in any of my guitars.
Best of luck!
- Glenn
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