I’ve done a lot of ESC temp testing and management over the past year or so. First of all, if you manage to get up to around 120c, the F3 (or whatever MCU) will shut down automatically and in the process reboot your ESC. Second of all, air flow is utterly critical. The 4in1 we run is relatively enclosed. We use an RC car ESC fan on it and it make a big difference in temps. From 80 down to 65.
Normal temp range is tricky. Really you just need to get it as cool as possible with heatsinks and air flow. How are they currently mounted? What are your ESC settings otherwise for BLheli32?
@AeRiAL_PeRpLeXiOn I can confirm all ESC temp telem is reported in celsius.