DHT11 calibration

hi,

i bought 2 dht11 sensors , have small electronic board attached them in picture:

http://i.ebayimg.com/00/s/ntawwduwma==/z/5-caamxqlw1rynym/$%28kgrhqvhjbkfhj74iindbrynylkch!~~60_12.jpg

i can read temp , humidity, off.

room temp: 37.5 / sensor reading: 35
room humid: 22% / sensor reading: 27%

i tried keep sensor in hand , temp spikes 70-80c sensor reading. put in container ice , temperature going 37-40c. humidity going down expected. both sensors behaving same.

is there way calibrate them?

i forgot mention wait in setup sequence 1 second , read sensor after 5 seconds in average, it's not timing causes problem...

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