как правильно задать вопрос к предложению.--- it is warm at nights and hot in day time

В этому предложению можно как минимум задать пять вопросов:
Is it warm at nights and hot in day time?
Why is it warm at night and hot in day time?
Is it warm or cold at nights and hot in day time?
It is warm at nights and hot in day time, isn't it?
When is it warm and hot?