Explain · Like I'm five version
British small talk about the weather in terms of a secret handshake
Talking about the weather is just a secret handshake that everyone in Britain already knows.
When you see a neighbour in the street, you cannot just say hello and walk away. That would be rude. Instead, you must mention if it is raining or if the sun is out. It is a special code that tells the other person you are friendly. You say the sky looks grey, they agree it is quite chilly, and then you both feel safe to carry on with your day.
This secret code works every single time you meet someone new. You might be at the park or waiting for a bus. If you comment on the wind, you are really saying that you are a nice person who follows the rules. It is like a secret knock on a door that lets you join in with everyone else. It keeps things tidy and stops anyone from feeling awkward or worried.
You never need to learn new moves for this handshake because the weather changes enough to keep it fresh. Sometimes it is a little bit drizzly, and other times it is surprisingly mild for the time of year. Each phrase is a tiny piece of the puzzle that fits perfectly into the conversation. It is the most polite way to show you are part of the team without needing to say anything very important at all.
Where the analogy breaks downA real secret handshake is meant to keep outsiders away, but talking about the weather is meant to welcome absolutely everyone in.