Ok, so that may not be so thrilling to everyone, but it is to me. I love rain and we haven't had much of it here lately. Rain and snow are known as the "poor man's fertilizer" and it really is.
Gardens and lawns don't do well without a rain now and then, no matter how much treated water you pour on them. Tap water has chlorine in it, which isn't good for plants, so they don't grow as well as they do when they get rain water.
Besides that, it's cheaper.
How's that for a frugal take? ;)