Looking on the internet deeply has found these results:

it has been raining all week is the most popular phrase on the web.

it is raining all week 17,200 results on the web	it has been raining all week 146,600,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Fact: Londoners have 101 ways to say that it is raining... I want to drive with the windows down, even if it is raining. It is raining strong, confident women in my house. Although, right now, I mean... it is raining. Imagine a cold wind, when it is raining. First time you came to visit me in Brazil... It didn't stop raining for a week. If it is raining tomorrow, we stay at home.	Ever since Hong Qi left, it has been raining. As far back as I can remember, it has been raining It takes some getting used to the unpaved road access, especially if it has been raining for a long time. It performs great displacements, reaching areas where it has been raining and where the new grass is present and at times, in such zones, big concentrations of animals may be found. Reasonable camping only if it has been raining become a mud gang. On good days the visibility can reach 25 meters, and less than 3 meters when it has been raining a lot. As far back as I can remember, it has been raining it has been raining all week

it is raining all week

17,200 results on the web

it has been raining all week

146,600,000 results on the web

More popular!

Fact: Londoners have 101 ways to say that it is raining...
I want to drive with the windows down, even if it is raining.
It is raining strong, confident women in my house.
Although, right now, I mean... it is raining.
Imagine a cold wind, when it is raining.
First time you came to visit me in Brazil... It didn't stop raining for a week.
If it is raining tomorrow, we stay at home.

Ever since Hong Qi left, it has been raining.
As far back as I can remember, it has been raining
It takes some getting used to the unpaved road access, especially if it has been raining for a long time.
It performs great displacements, reaching areas where it has been raining and where the new grass is present and at times, in such zones, big concentrations of animals may be found.
Reasonable camping only if it has been raining become a mud gang.
On good days the visibility can reach 25 meters, and less than 3 meters when it has been raining a lot.
As far back as I can remember, it has been raining
it has been raining all week