It is able to measure temperature between -40 and 80 degrees with -/+ 1 degrees of error margin, likewise, it is able to measure humidity between 0% RH to 100% RH with +/- 5% RH of error margin. It is possible to collect data from this breakout once in 2 seconds. DHT22 is a bit larger than the other models of DHT sensors.
Features:
Note: It is needed to wire a pull-up resistor between the Vcc and the output pins. By this reason, You will need to use is with a resistor between 4.7 k and 10 k. As the DHT11 is a similar version of this product, all the projects done with this sensor will work on the other model too.
Documents: