digraph G {
 rankdir=LR
 node [shape=box, fontsize=9, height=0.1, width=0.05 ]
 edge [arrowsize=0.5, len=0.1]
"Temperature\n"
"season\noperation\n"
"Hour\n"
"month\n"
"day\ntoday\n"
"month\n"->"season\noperation\n"
"day\ntoday\n"->"season\noperation\n"
"Hour\n"->"season\noperation\n"
"season\noperation\n"->"Temperature\n"
}