It's an inside arena, so no natural winds. San Diego weather is normally mild. Only exception is if the venue is that of ice, such as an ice skating show then it's fairly cold due to the frozen arena.
Depending on the time of year. I have been there in summer and winter and it was warm in the summer and cool, not cold in the winter
No.
Yes
That is entirely dependent on how much fog Is in the air
No but outside yes
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