Strange incoming search terms behaviour form Google (observation)

[SEchecker]

I’m observing already a couple of months a very strange behaviour of incoming search terms from G.

To give an example:


search term 1 - 5 incoming from different countries in 20 sec, then hours nothing sometimes not even the rest of day/night

search term 2 - 10 incoming in 2 min., then hours nothing
search term 3 - 1 incoming per 1 min all day long
search term 4 - all over the day but ony weekends
search term 5 - Only at the end of month


Is it really possible that visitors from different countries (different hosts & IP´s) type in the same search term in 20 sec visit our site and then none does it all day/night long?

[rowtc2]

Is possible, otherwise SERPS will be dominated by the same sites forever. Google may show by rotation some results to measure on-page indicators for different pages/websites on a given query and to give a chance to get backlinks, if content is useful.

Also, they may do this to not be able to guess algorithm.