What is this poem,Let Us Once More Praise The Rain, by Conrad Aiken about?

Beloved, let us once more praise the rain.


Let us discover some new alphabet,


For this, the often praised; and be ourselves,


The rain, the chickweed, and the burdock leaf,


The green-white privet flower, the spotted stone,


And all that welcomes the rain; the sparrow too,—


Who watches with a hard eye from seclusion,


Beneath the elm-tree bough, till rain is done.


There is an oriole who, upside down,


Hangs at his nest, and flicks an orange wing,—


Under a tree as dead and still as lead;


There is a single leaf, in all this heaven


Of leaves, which rain has loosened from its twig:


The stem breaks, and it falls, but it is caught


Upon a sister leaf, and thus she hangs;


There is an acorn cup, beside a mushroom


Which catches three drops from the stooping cloud.


The timid bee goes back to the hive; the fly


Under the broad leaf of the hollyhock


Perpends stupid with cold; the raindark snail


Surveys the wet world from a watery stone...

What is this poem,Let Us Once More Praise The Rain, by Conrad Aiken about?
I think it is just saying the rain is pretty cool cuz its like water falling from the sky n it gives us like life n yeah just saying the rains beautiful. i dont c any symbolism at all but there could b