What does it mean that the weather is as cold as a joke and the days are like nonsense?

It means the weather is so cold that it can only be used as a joke; Life has always been boring, boring like nonsense.

It can also be understood as: the weather is really cold, and other words can't describe it. Life is meaningless, and living is like being redundant.

The enlightenment of this sentence:

If every second of our life is repeated countless times, we will be crucified like Jesus and crucified in eternity. This prospect is terrible. In the world of eternal robbery, unbearable responsibility weighs heavily on our every action, which is why Nietzsche said that the concept of eternal robbery is the heaviest burden.

If the return of eternal robbery is the heaviest burden, then our life can compete with it with all its brilliant ease.

Interpretation of figurative sentences:

The meaning of metaphor is a commonly used rhetorical metaphor. In layman's terms, it is to make readers understand what you want to say, to make a very ordinary thing different, and to compare a thing that is not right with yes. Use an alternative and vivid sentence for analogy. Such sentences are figurative sentences, which are generally composed of noumenon, vehicle, figurative words, simile, metaphor and metaphor.

In fact, figurative sentences are composed of ontologies as carriers. What are ontology and carrier? Is to compare one object or person with another. This is called metaphor. Therefore, they are called ontology and metaphor.