DHT22 is using a time critical protocol, but with an atmel coprocessor it is quite simple to attach this to scratch.
See also DHT11, DHT22 for scratch
2015-04-11 initial upload.
I have closed the comment function for this page (thank you spammers). If you have questions about the software, please write me an email. Sorry.
Or raise topics in raspberrypi.org, forum, scratch.