Some people say that you can't visit other people's houses in rainy days? Is there such etiquette?

Don't go if you have nothing to do. Inconvenient. First, there is lightning in rainy days, and the safety index is not high; Second, shoes are wet and dirty in rainy days; Third, it is cool in rainy days and easy to catch a cold.

You can't drop in on rainy days. Never heard of this etiquette. If you have something urgent to do, how can you care about the weather?