Getting ready to pour concrete in a barn with a block foundation and wood siding. The temperature here is near 55 during the day and 32-34 at night. If the concrete is poured early in the day will it cure enough to be ok with the low night temperatures? The block foundation is above grade with the barn built on top pole barn style so the fresh concrete will be shielded from the outside by 1-2 concrete blocks. The wood siding has ¼ in gaps so it provides little protection. If this is not acceptable I will just use the gravel base till weather gets warmer and concentrate on putting metal siding on.