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The only estimate i have ever seen is one by the USGS, they estimate that (or report that) there is an estimated volume of 3100 cubic miles of water in the atmosphere at any one time. (IIRC) One way to see if there is more water in you local atmospheric area (!) today than yesterday is to look at your barometer or the local weather report, if you have a falling barometer then you have greater water vapour in the atmosphere.