Impact of the visit weekend weather on the admitted graduates' grad school decision in the US
The short non-scientific answer: YES

My answer is just based on anecdotes and I am not aware of any methodological research on this subject (it is not my field of research). I've listened to an episode of This American Life about this subject, in which they interview professors on the admission committees of different universities. According the the interviews, visiting a university is a good indication that the student is interested in the school and is more likely to attend the school if he/she is admitted.

This is episode "504: How I Got Into College" of the podcast, which you can find here (http://www.thisamericanlife.org/radio-archives/episode/504/how-i-got-into-college).

P.S. I tried to post this as a comment to the question but it was too long. I apologize if this is not the answer you are looking for.