Is this going into production ? or is this for personal use?
things to look out for and add your own checks if the sensor keeps sending these values
85C - the temperature sensor has either not received an instruction to do a temperature conversion, or it has not had the time or the power to do a conversion. Check for fallty connection in I/0 data line and power line. Check for corosion in connector or inside sensor housing. 3.3v power Might not be stable
0C - Check for too much resistance in line pullup resistor. Check for faulty connection in I/0 data line. Check for corrosion in connector or inside sensor housing. 3.3v power should be stable
This should help you get started - you will need node-red-contrib-string node-red-contrib-string (node) - Node-RED
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Just play around with what i did. This is not a soulution but a stepping stone to point you in the right direction.