某年某月某日雨昔年昔月昔日晴
[mŏu nián mŏu yuè mŏu rì yŭ xī nián xī yuè xī rì qíng]
These two phrases contrast weather conditions on certain dates: 'A certain year, a certain month, a certain day it rained' with 'In past years, months, and days it was sunny.' It implies reminiscence or nostalgia for different moments in time.