How do you say

There has been such extreme weather recently.

..in Chinese?

这几个月的天气变化真大。

zhè jǐ gè yuè de tiān qì biàn huà zhēn dà 。

How do you say "I’ve been taking a cooking course, and lately, I’ve been concentrating on sushi, although my rice was still turning out a bit chewy at first." in Chinese?