Every year so many children dress up in astounding costumes and show up to grab treats or trick people. The count of trick-or-treaters has been recorded in 30-minute intervals and this data has been tracked from 2008-2018.
A visualization of this data can be seen below which depicts the total number of visitors calculated at 8:15 pm every year. In addition to this, a major impact of the weather conditions(rain%) on 31st October each year is shown as well to develop a relationship between the two data sets.

The visualization above depicts the changing trend of visitors each year. It can be noticed that 2011 observed the highest number of trick-or-treaters which might have been possible due to 0% rainfall on that day. In 2013, most probably due to a higher percentage of rainfall recorded the number of trick-or-treaters was low.
Moreover, a fall in the number of visitors can be seen after 2011 till 2013 in contrast with the raise in the rain%. The reduced number of visitors from 2017 to 2018 might have also been affected by the higher rain% in 2018.
However, rainfall throughout these years might not have been the only reason to impact the number of visitors but it surely has affected it in some way, along with other external or internal factors.