The dirty way could be to redirect the output of your program to the pts file of an already existing terminal.
To know the pts file just type
then your crontab would be:
0 07-17 * * * /home/dat/scripts/cron.out > /dev/pts/4
Another way could be to launch the program as an argument of the terminal:
xfce4-termianl --command=/home/dat/scripts/cron.out --display=:0.0 -H
display is the X display where you want to show the terminal,
-H is to tell the terminal to stay open after the command is terminated.
This will create every time a new terminal.
0 07-17 * * * /usr/bin/xfce4-terminal --display=:0.0 -H --command=/home/dat/scripts/cron.out
if the display is not present you will have an error logged by syslog.