I may have some of the same limits you have. But, I'm just guessing ...
I get everything off a couple of my gardens before winter. Plants that were hardy enough to not be killed in the first fall frosts are buried under about 8" of soil in October. I can dig into that bed in March and still find green plants ..!
Nothing much decomposes no matter where it is until July -- then, it nearly bursts into flames! Two months, everything shuts down again.
Moisture is a real limiting factor along with the lack of ambient warmth. That's here, where we may get zero rain during some of the summer months. I find that as much soil-contact as possible is important. Of course, I have to run sprinklers on the compost about once a week.
Another important element is patience (unless it's mid-summer
). I can carefully build a fairly conventional compost pile and simply leave it alone ~ unturned ~ for 18 to 24 months and it will be pretty good compost. I used to do that but I may be a little more impatient now, in my olde age ...
We are each other's harvest; we are each other's business; we are each other's magnitude and bond. ~ Gwendolyn Brooks