Anyone with valves out of adjustment or other compression issues will have a difficult or impossible task starting COLD.

The worse the loss of compression issue is, the higher the ambient temperature failure point will be.

The ability to start a diesel engine in serious to extreme cold is a very good indicator of engine maintenance and overall condition.

Humor ?
You know it is COLD when:

You look like this, just walking to your car...


Almost all schools in Michigan closed due to COLD weather.
Hundreds of Michigan schools including colleges cancel classes amid cold


Schools across Wisconsin close as high temps stay below zero; gov announces propane measures | Star Tribune

Milwaukee County offices, buildings to close Tuesday due to dangerous cold | Milwaukee County - WISN Home

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__________________
ASE Master Mechanic

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D

https://www.boldegoist.com/