Not sure whether day-length or temperature, or a combo is the answer. All of my Celeteses, for example, haven't added a new leaf in 6 weeks, but my Armenian has a full load of next year's brebas, already, and if we have a few more warm weeks, they might ripen this year. Then there is my Lebanese, which has has 50+ figs on it (at 30" tall) and hasn't ripened even one, in what is arguably the longest, warmest fig season in years, and shows no sign, whatsoever, of doing so any time soon.