The temperature sensors are considered to have excellent accuracy of +/- 0.5 °C (32.9 °F) measuring in the range from 0 °C (32 °F) to +65 °C (149 °F) based on factory calibration on each sensor. Long-Term stability of better than 0.04 °C (32.072 °F) per year results in an accuracy better than +/-1 °C (33.8 °F), in the range 0 °C (32 °F) to +65 °C (149 °F), after 15 years.

For more information on temperature accuracy see here.