Temperature depends a little on how accurate you want it and most of all what are those "harsh" conditions ?
The exact conditions will often determine the sensor.
So...Chemical ? Heat ? Noise ? Vibration ? High LEL ? Do you need "intrinsic" safe items ? etc etc etc.
The question is much to vague to even make any sort of guess.
In most cases you can also get the same sensor but suitable for "X" conditions.
Point also to take into account is cost.
Once you enter some conditions then that sensor may cost many times that of the cheap Chinese version.
Other factors might be how close to the sensor is the MKR going to be ?
If its a long way then buffer amps may also be required.
IP ratings come with cost too as well as other specifications that must be adhered to to stay safe and maintain a standard.