我恨讨厌寒冷的天气    In general, chinese people prefer to say 讨厌寒冷的天气，but 恨寒冷的天气is good，too. When you use 恨， it usually means you dislike cold whether very much, you dislike cold whether in an extreme way, this is a very emotional expression.

今天,的一点点阳光明媚的。 The word 阳光明媚 is a very good word. However, it doesn't mean a little sunny. The word 明媚 means that it is very sunny. There are sunshine everywhere, or the sun is shining brightly, which makes you feel very marm and comfortable. When you use 一点点 to define 阳光明媚， it's contradictory. Because if it is 一点点，it can not be 阳光明媚. If it is 阳光明媚，it can't be 一点点. You can express only one meaning at a time.

It's a little sunny today.
但是，它的仍然十分寒冷。   There's no need to translate 它的
However, it's still very cold.
和而且我现在生病了。        
And I'm still sick.
我恨的寒冷。                Well, actually, you don't need to translate the word 'the" and "a" into Chinese.
I hate the cold.