Somebody in rural Africa once told me, "one advantage you have living in a colder area is that you don't have to run your fridge for half the year!" I honestly didn't have any good answer for him as to why I do anyway.
This paper [1] has some discussion of testing differences between 16 C, 25 C, and 31 C ambient exhaust conditions. It's actually a fairly significant difference under testing. ~(0.35, 0.70, 1.05) kWh / 24h for (16 degC, 25 degC, 31 degC). Refrigerators in experiments were kept at ~ 5 degC (approx 600 tests).
[1] https://d1wqtxts1xzle7.cloudfront.net/82169783/j.ijrefrig.20...
Of course this might still be micro-optimization from a rural Africa point of view. And a part of the reason for running the fridge is still just convention and convenience.