There have been a few discussions about the accuracy of temperature sensors.
I did a fairly careful comparison of several different types and found the DHT22 (at least the 2 I have) to be reasonably accurate. Have a look at:-
Is my PiicoDev BME280 Atmospheric Sensor faulty? - Support / Product Questions - Core Electronics Forum
Maybe you have a bad one but it is quite difficult to do proper comparisons unless you are pretty careful about having all the sensors in the same conditions.
Ian
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