This time of the year a breeze is a given if you move them outside. I usually do that when they start putting on new growth which means the graft is at least partially healed. I do not remove the clips until they pop off on their own or I am setting them out into the garden. Even then I don't always remove the grafting clip if the plant looks a bit iffy.
Your grafts look great but down here they wouldn't supply the one thing that is most important and that is protecting the roots from soil diseases. With your joint that close to the soil the scion would put out roots, especially if mulched which is a necessity down here where temps can get to 100 or above more times than I would like. I don't imagine fusarium wilt or nematodes are a major concern that far north.
Bill
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