It is mentioned 12,440 times.
Approximately 28 times
Many, but only in the context of lack of it.
In the King James Version of the Bible, in both the old testament and the new testament together, Rain is mentioned about 94 times in total. My source is:...
The word save is mentioned about 226 times, however the use of the word is applied in different ways.
The Evolution of Bible Interpretation
David Maine's Interpretation of the Bible
Richard Cizic on How to Interpret the Bible
Jim Wallis on How to Interpret the Bible