Don't think I've seen a map before, only verbal descriptions
Found the map on TimeTemperature.com while looking for Daylight Savings info. Can't ever remember the dates. It turns out it's not the same day every year and is different than the US. Mexico changes the last Sunday of October and the US changes the the first Sunday of November.
Sonora and Quintana Roo don't observe Daylight Savings Time and the first 20 KM's of border states change their clocks at the same time as the US. Sonora doesn't because Arizona doesn't. Quintana Roo dropped out when it changed Time Zones this year.