If you come from a very hot or tropical country e.g., an African country near the equator, you should bring some warm clothing even in summer. Every cloud has a silver lining. Bad things always have a good side. Open your coat or jacket and you can see the lining inside. It's an ill wind that blows nobody any good.
Nobody can benefit from whatever is happening.
It's a storm in a tea-cup. Used when people become very upset about unimportant matters. He's a fair-weather friend. Yes, when you're 'down on your luck' you find out who your friends are. Let's save it for a rainy day.