I bought this app because I have summer-onset SAD. Basically, it's a bit like the winter version, except that bright, hot summer days bring about the "blahs"--including weakness, tiredness and lethargy (yes, the condition exists, believe it or not!)
After a string of 90 degree weather, I was feeling particularly blah. I came across this app and, remembering how I feel energized during overcast days (and how much I love the sound of rain!), I thought I'd give it a try. I mean, it's only 99 cents, right?
As soon as it installed and I saw what it did...WOW. I felt a good bit better. It's as if you're lying down, with a window above you, and rain splatters gently on the glass. In the sky, clouds scuttle across slowly--with peeks of sun shining through.
And the sound of rain! LOVE it! So relaxing. Even some thunder sprinkled in.
If you love the sound (or looks) of rain, I highly recommend this app for the Kindle Fire.