Charging voltage question?
Cooler Canadian weather is a blessing.
This is recommended maximum float voltage vs battery voltage, not ambient temperature. AGM battery systems typically incorporate battery temperature sensors.
While 13.8V at 77F is typical for well maintained Mopar, I doubt they cut back to 13.44V at 104F. I am also guessing that under hood battery temperature will exceed 104F, on a regular basis.
More information here:
AGM Charging : Technical Support Desk