Reasonable moisture% and moisture differences?

[Andreas75]

Hello.

I measured a bit with my low-budget Claes Ohlsson weather station.
Got during a cloudy day:
Upstairs: ~20 degrees, 52-56% humidity
Downstairs: ~20 degrees, 57-63% humidity
The rooms I measured were directly above/below each other. (See attached image)

Is this normal humidity?
Are these normal differences between upper/lower floor?

Is it reasonable to think directly that the extra moisture downstairs comes from the floor/ground, or could it be because we just happen to have laundry + shower in other rooms downstairs that contribute to the humidity?

Or are there other reasons for the humidity?... It indeed feels significantly colder and damper downstairs?

Thanks for the answer.

Regards,
Andreas