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First of all, the weather is a countable noun, for example, the weather in Beijing and Toronto is different. The weather in Beijing and Toronto is different, but in most cases, weather is used in the singular when describing the weather in a place.

Words like family, fish and hair. It's all uncountable in textbooks, but in some specific cases, it all means something. Don't study too hard.

If such weather is used, it can be said that such good weather is equivalent to the sound speed A weather.