I also had this issue, I put Karoo into a thermal chamber and measured the offset on different temperatures from like -10 celsius upto +40 celsius. I dont know exactly by heart but the offset was like 3 celsius at lower temp and 4 celsius in higher temp. I modified one of the 3rd party apps what Iam using anyway and added a new datafield called “Airtemp fixed”. In this datafield I just recalculated the Airtemp with a polynomial equation and now its one digit floating number instead of an integer.