[Ray76]

"yourdictionary"?

Webster's

Definition of rain

1. a: water falling in drops condensed from vapor in the atmosphere
   b: the descent of this water
   c: water that has fallen as rain : rainwater
2. a: a fall of rain : rainstorm
   b: rains plural : the rainy season
3. rainy weather
4. a heavy fall • a rain of arrows

https://www.merriam-webster.com/dictionary/rain

The plural form refers to "the rainy season", as does the definition provided by you in post 117. Which is what I said in post 110 - “rains” used to be a reference to “the rainy season”. That usage has been enlarged to include how this article uses it.

[TigersEye]

The usage has been enlarged, as in the last 200-300 years?
If changes to language were all unacceptable we should all
still be speaking Old English.