We‘re in the DC area and finally supposed to have the ground dug in the next few weeks For our 15x30 pool. No hot tub and only 3.5 to 6 foot deep. We’re told there’s only one guy around here that shoots the gunite. How will weather impact us if the pool is Durand everything ready but it rains hard or there’s any other surprise weather in our areas? How cold can it get and still be safe to shoot?