Ambient temperature is the temperature that surrounds your refrigerator, most commonly called room temperature.
The temperature inside the box can only be measured while the door is closed, if you want a reliable reading, or by taking a reading from something that is inside the fridge, if the door is open, like a bottle of water.
When you open the door, ambient temperature air rushes in to replace the cold air that falls out of the inside of the fridge. It's common for RVers to state that it takes hours for the fridge to recover from the opening of the door, but in reality, that's true only if the fridge is empty. If the fridge is loaded, like a couple cases of water, the temperature of the air will, in a very short period of time return to the temperature of the items in the fridge.
In short, it sounds as if you have no problem.
Ed
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