it's rained all day

[Katz]

"After the whole day of English weather I realized that it's the first time it's rained all day since I came to this city five months ago".

Is the boldfaced part of the sentence gramatically correct?

Many thanks in advance

 

[bhaisahab]

"After the whole day of English weather I realized that it's the first time it's rained all day since I came to this city five months ago".

Is the boldfaced part of the sentence grammatically correct?

Many thanks in advance

Yes, it is.