digraph G {
 rankdir=LR
 node [shape=box, fontsize=9, height=0.1, width=0.05 ]
 edge [arrowsize=0.5, len=0.1]
"Temperature\n"
"Date\nHour\n"
"season\n"
"operation\n"
"Date\nHour\n"->"season\n"
"Date\nHour\n"->"operation\n"
"season\n"->"Temperature\n"
"operation\n"->"Temperature\n"
}