How do you say

He swam three times a week over the last three months.

..in Chinese?

过去三个月,他每周都会去游泳三次。

guò qù sān gè yuè , tā měi zhōu dōu huì qù yóu yǒng sān cì 。

How do you say "Beijing’s weather will turn gradually colder in the next three months." in Chinese?