Negative values saved in _temp as 6553.5 for -0.1, and increasing

[logan893]

Perhaps related to some compilator specific quirks. My compiled sketch is very old, from Arduino IDE 1.8.1, and has been running for a long time with a modified version of the idDHT22 library. The temperature storage section is identical to this library.

I suggest you change it to something like this, to avoid issues with compilator quirks messing with how unsigned int/short variables are handled.

_temp = word(_bits[2] & 0x7F, _bits[3]) * 0.1;
if (_bits[2] & 0x80) {
	_temp *= -1;
}