LM34/LM35 Temperature Sensors

I would like to use the LM34/LM35 temperature sensor in a circuit but I would like to be able to use the sensors full range. This sensor outputs 10mV/º which is easy enough to measure using the on-board AD. The problem is when the sensor measures a temperature below 0ºC/32ºF. The output from the sensor needs to become a negative voltage. After wiring the sensor for single power supply operation according to the datasheet I have the sensor reading fine but now I'm not sure how to get the pic to read the thing properly. Could someone possibly shed some light on this one for me.

Thanks