Dont know of one right off that states temperatures but the thing is about pears is they can be grafted totally dormant it doesnt matter. Pears on a busy year i have even grafted at the end of February on a warm year. Since Pears are the easiest to graft i would do those first. Apples are second easiest similar to plums. The hardest trees to graft which i would not consider until i see green on the tree is apricot and peach. Mulberries can be tough because you never graft those dormant and timing them perfectly can be hard because sap seems to flood the grafts like grapes. Mulberries are still considered advanced grafting. Consider tbud or chip grafting mulberry or che. In Kansas the sealants melted enough on my grafts some years to prevent them from callusing together. I changed my Grafting method and no longer use toilet seal wax or pruning seal unless im out of everything else. My graft rates are near 100% now. Had no failures last year at all. I count it if they break off as a failure. I consider a break off as grafter failure even if the graft takes it was poorly done. In Kansas our strong winds and birds break many grafts. Adapted my method to use clefts that are stronger and no staking is required. This link shows my current methods Grafting large Callery and BET pear rootstocks in 2022
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