I have a site http://www.mybridaldress.com/ i got much more visitors on 5th of july from USA ,more than 400 but rest of the days only 40 or 50 visitors were coming on the site , let me know the exact reason behind this
Did you investigated where that traffic came from? If it came from Google search click then you might got involved in fluctuation..
That is why Google Analytics has the tabs on there for a reason (i.e. All Traffic Sources, Keywords, Search Engines). Try to investigate more before asking questions here.
Do you actually have analytics installed on your site? If so you will easily be able to tell where the traffic came from.
Although google analytics is a great tool but as it only calculate space after its code is written on web site. So, you should use stats software provided to you by the host in company control panel so can also see existing the existing traffic sources.
depending on how many visitors a day your website gets and how long they stay, google analytics could actually hurt your rankings in the serps... in my opinion its better for google to have only the parameters I want them to when they evaluate my sites... food for thought....