One really has to understand the characteristics of diesel fuel. #2 diesel will start to cloud at +15F. Filter issues will likely follow once temps go lower. Biodiesel is blended in to most diesel nowadays is varying percentages. Bio will start to cloud at +32F. And moisture is the third issue. All modern diesel engines return fuel to the tank from the rail. That makes diesel in the tank warmer than the ambient temperature. When the vehicle is shut off, the fuel cools and condensations then can become an issue. Most folks should take proactive measures with their diesel fuel if temps are going to be cold. Add a quality additive that protects from both gelling and freezing. If it is gong to be in polar vortex territory like many of us dealt with recently, a mix of 20-30% #1 diesel in the tank is advised.
My semi truck operated the entire period during this major cold snap. Minnesota, Wisconsin, Iowa, Nebraska, Illinois, and Indiana. Narry a fuel related issue. Finally on Friday morn of that week, I did need to replace a fuel filter. Easy job in less than 5 minutes while I was fueling in Walcott, Iowa.
It is one of the reasons I only get diesel engine vehicles when there is no other practical way to do things. Like my commercial trucking operation. But for my personal stuff, I avoid diesel like the plague. I go thru 21,000 gallons of diesel a year. I have 50 years of dealing with diesel issues including 10 years in Alaska. The glitz and glamour of diesel wears off real quick when one is sidelined along the road at -20F in the dark and one is having to change a fuel filter along side the road.
But some folks are gluttons for punishment. Unless they are very proactive about fuel management with their diesels.