During cold conditions especially in the morning the diesel engine when you start it it runs so rough i want to know why this is so?

In cold conditions, diesel engines can run rough at startup due to several factors. Firstly, low temperatures can cause the fuel to thicken, making it less efficient for combustion. Additionally, the viscosity of engine oil increases in cold weather, leading to increased friction and sluggish engine performance. Moreover, cold temperatures can affect the glow plugs, which are essential for pre-heating the combustion chamber, resulting in incomplete combustion and rough running until the engine warms up.