How do you say

There has been great variation in the weather in Beijing recently, with a large temperature difference between day and night; one must take care to wear adequate clothing to keep warm.

..in Chinese?

北京近期的天气变化很大,早晚温差也很大,需要注意添衣保暖。

běi jīng jìn qī de tiān qì biàn huà hěn dà , zǎo wǎn wēn chà yě hěn dà , xū yào zhù yì tiān yī bǎo nuǎn 。

How do you say "I've had this shirt for almost two months, and it's still new." in Chinese?