' " Rain-Falling from the skies " This is a most emotionally reflective song with the singer wanting the "rain to wash away my tears." This is Sinatra at what he does best-showing his emotional nakedness during another love quandary. Listen near the end when he becomes more optimistic for " When that sun appears, I'll see my love again !"
Nelson Riddles arrangement recreates the sounds of falling rain in a most atmospheric manner.
Great song, great singer, great arranger-a musical trifecta. 

https://youtu.be/XLjtJZdBhtE