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Is everybody's DHT22 working OK? Did you compare the readings with any other humidity sensors?
I started to test my camera again and it is incorrectly showing 20% humidity while it should be about 50%. The sensor is almost new so I am not sure if it broken or there is something wrong with the software.
Also while speaking of DHT22, the stated accuracy of +-2% is only for humidity over above 20%. It gets as bad as +-5% below 20% humidity. Very inaccurate for our purpose.
Also these sensors are notorious for breaking. Apparently most last less than 1-2 years.
I am looking into BME280 sensors now... +-3% accuracy across the whole range.
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