A drop fell on the apple tree
Another on the roof
A half a dozen kissed the eaves
And made the gables laugh
A few went out to help the brook
That went to help the sea
Myself conjectured, Were they pearls
What necklaces could be!
The dust replaced in hoisted roads
The birds jocoser sung
The sunshine threw his hat away
The orchards spangles hung
The rain washes away the dust on the roads. 
 
 Here, the rain is a means through which the old is washed out and a clean start can begin; the dust that has accumulated on the roads is replaced by the fresh water. This is often an image that is associated with rain – wiping the slate clean, bringing new life, etc. It is yet another very positive view of the weather.
Summer Shower