I've been monitoring one of my rooms with a de-humidifier.
Outside it was 93% and 0C, in the room, it was 69% and 10C at 2:30 and with the de-humidifier on since then, (6 hours) it has dropped to 61%, but the temp has gone up to 11.1C, so it's probably just heating the room, and removing a little water.
You've changed the gap to increase it a little vs. the dewpoint, which changes relative humidity a lot.
In the states (where the humidity in the summer can be super nasty just because the dew point can reach into the mid 70s in a lot of areas, and touching 80 from time to time (that's F, which would be about 27C), folks will often say here that the humidity is 10% somewhere or 95% and 95 degrees.
The dew point with any heat is generally what we're sensitive to. When it's 75 degrees, it's pretty intolerable - paper is mushy and tears easily, even if it's 85 degrees in the house, and things like leather coats in closets will develop mold if unchecked. Btdt (and so do books left on shelves).
Brian McNoldy's T/Td/RH Calculator.
bmcnoldy.rsmas.miami.edu
Nifty calculator. In the US, I'll convert this to C, I've seen even supposedly well educated people suggest it's near 100 degrees F (38C) where they are and 95% humdity and unbearable. To find that the dewpoint is 75 (24C) degrees where they are and the relative humidity is actually 45%. If they were close to 75 degrees outside, it would be close to 100 RH and feel less hot (which is about what the temperature would be if it started to rain where they are, otherwise the air wouldn't be saturated and there would be no rain). When you say that RH is probably about 45 percent at that, it usually incites an argument about how it couldn't possibly be (has anyone ever been somewhere that it's 95 degrees and raining heavily? I haven't. It could be 95 degrees before heavy rain (33.3C), but it's almost exactly the dewpoint during (24C) it)