Is of an evening good English?

"Of an evening" is a grammatically correct phrase, but it's considered formal and somewhat archaic. It's not commonly used in everyday conversation.

Here are some more natural ways to say the same thing:

* In the evening

* At night

* During the evening

* Every evening

For example, instead of saying: "I enjoy reading of an evening," you could say:

* "I enjoy reading in the evening."

* "I enjoy reading at night."

You could also use "of an evening" in a more formal or literary context, like:

* "The old man would sit by the fire of an evening and tell stories."

Ultimately, the best choice depends on the tone and context of your writing or speech.