I have a couple digital humidity meters around the house. They all measure RH within 5%.
A DHT11 measures 20% less than these. So if the digital RH meters are displaying 66% the DHT is measuring around 45%.
One thing I find awkward is that on the DHT11 the dew point is calculated just above 0C. My windows have condensation on areas at which the temperature is below 4.5C, so for a start the dew point of 0C is wrong.
Any ideas what could be causing this? I have two sensors, so that rules out a faulty one.
There is an old thread where people reported this issue, but apparently no solution found?