digraph kb1 {
node[ height =.25,fontsize=10];

burlington[shape=box];
jan[shape=box];
t[shape=box, label="18.0"]
p[shape=box, label="22.2"]
 

temperature;
precipitation; 
 
edge [arrowhead=none];
burlington->temperature;
burlington->precipitation;

edge [arrowhead=normal];

temperature->t;
precipitation->p;

jan->temperature[label="arg",fontsize=9];
jan->precipitation[label="arg",fontsize=9];

}