Calokie, that looks like a very complete sheet! Right now I am more interested in logging hours at different temperatures for peach grafts, you probably don’t normally need that fine-grained degree of data though.
I was out logging my grafts today since I didn’t get around to writing down what I put where (I both write on the tree and then later in my spreadsheet) and I noticed many peach grafts from five days ago are already pushing a bit. I had heard you don’t need more than a couple days of good temps, and looking at my temperature history I got 2.5 days (60 hours) of nearly solid 60-80F temps before it dropped to more like 50F on average. Taking the over-heating into account, I lost about 8 + 8 = 16 hours of that 60 due to over-heating in the sun on two days so thats a total of around 45 hours of good callous temps. I may have added a few more good hours because it was sunny a bit in the last few days around 50F. The sun intensity was much lower and I didn’t measure the graft temperature directly, I will try to do that in this cool spell to see how much warming I am getting to see if I am getting any good callous hours.
Here is picture of one, they are just barely pushing but based on past experience thats a very good sign:
As I work more on this I’m more and more thinking about measuring peach callous hours, the number of hours where the graft area is from 60-80F. Maybe you need something like 40-50 peach callous hours and you are good, provided they happen without too many overheating hours in between. It will be interesting to see if later grafts are failing due to too much overheating, or from the tree being at a later stage of growth. Its probably some of both.