Accuracy when reading the temperature with PT100 and NI9219 Module

Hello,

I´m reading the temperature with a PT100 connected to NI9219 Module. I have put LabVIEW on mode 4-Wire RTD (range PT100). I´m able to read the temperature but I´m not sure weather the accuracy it´s right or not. The temperature oscillates between 25.5 and 25.8°C. Is that possible? Am I able to do something to have more accuracy?

Thank you in advance,

Claudia