Since we have been here, it has always been raining at nights, daylights have been sunny and I expect it will continue like that.
This sentence means that up to now only the nights have been rainy but imagine that before saying this sentence, I heard the weather broadcast announcing that the weather was going to change : "the rain will fall both at nights and daylights tomorrow"said the weather man, could I change my sentence and say:
"It has only rained at nights for 3 days but the weather is going to change tomorrow, it will be raining all day."
Can I, in that case used ppsimple as the action of raining at nights has been completed.