The weather in the south is warmer than ( that ) in the north一定要加that吗,什么情况可不加

What's the weather like in December What's the weather like in spring? what's the weather like in winter? What's the weather like in autumn? What's the weather like in Harbin? How`s the weather in Shanghai? What's the weather like in winter? 翻译：How's the weather in Beijing? How's the weather in London? what's the weather in china what's the weather like in Sydney. what s the weather ____ in autumn What's the weather lire in spring? What's the weather in Beijing. How 's the weather today in boston?跟How 's the weather in boston today? HOW's the weather? what's the weather What's the weather like in Beijing?改为同义句____ ___ the weather in Beijing?