You'd better take your coat. It rains out there.

[Nonverbis]

This is from a textbook on grammar called "A Grammar of Present-day English" by I.P. Krylova.

Task: Make up situations to justify the use of the present indefinite and the present continuous in the following pairs of sentences:

You'd better take your coat. It's raining out there.
You'd better take your coat. It rains out there.


The first case is understandable. It is being raining right now.

What about the second case? Does it mean that in this period of year it may rain any moment even if right now the sun is shining?

 

[jutfrank]

Yes, that works.

 

[teechar]

The first case is understandable. It is being raining right now.

What about the second case? Does it mean that in this period time of year, it may rain any moment even if right now the sun is shining?

It's not about a particular time of year as such. It just says that there is a reasonable chance one would encounter rain in that place.