To convert the voltage to temperature, simply use the basic formula:
Temp in °C = [(Vout in mV) - 500] / 10
So for example, if the voltage out is 1V that means that the temperature is ((1000 mV - 500) / 10) = 50 °C
If you're using a LM35 or similar, use line 'a' in the image above and the formula: Temp in °C = (Vout in mV) / 10