When to make winter biodiesel

I just made another batch of biodiesel today. That's 170 liters of raw biodiesel.
I also put 170 liters of the former batch into the washing process.
And before that I also took 150 liters out of the washing and drying process and put some in a barrel for the winter and the rest has gone in the tank of my car.

Yes, the winter. July and August is the time you should be making your fuel for the winter. When I make my biodiesel I let it sit for quite a while and then take biodiesel from the top and store it for the winter. The lower half of the biodiesel goes into my fuel tank during the summer.
That's how I got through all of last winter without using petrodiesel at all.

Temperatures fell down to -6°C (21.2°F) and my car was outside all winter but I didn't have any trouble starting the car or driving around with my B100.