I avoid cron job at this time for this reason and for many other random problem because 3:00 am seem to be often choose for a maintenance like automatic update, server reboot, database backup..
Can be tricky: an old project had a job that ran every 15 minutes to poll data from a popular smart thermostat company. I always knew when DST was starting or ending because that job would throw an error email at 2/3am on those days.
