Final answer:
The narrator in Don Juan attributes Don Juan and Julia's affair to the warm climate, using it as a metaphor for passion and a loss of self-control.
Step-by-step explanation:
True, the narrator in Don Juan does fault the warm climate for Don Juan and Julia's affair.
There is an insinuation that the warmth and sensuality of the environment contribute to the lovers' indiscretion. It is a common literary device to attribute certain behaviors and events to the influence of the setting in which they occur. The warm climate in this context of the poem serves as a metaphor for passion and the weakening of self-control.