Hi Leolaia, okay I looked it up. Just a quick rundown.
Note that the Jews had major festivals for the year connected with their harvesting. Passover was connected with the barley harvest, beginning Nisan 15 in the spring, the first month. Then 50 days later was the WHEAT harvest, connected with the festival of Pentecost. Then in the fall they had the week-long Festival of Booths which celebrated generally the major harvests of the summer and the end of the harvest season. Here's a basic rundown of the crops:
Month 1-2 (April-May) Barley
Month 3-4 (May June) Sivan, Wheat harvest, beginning Sivan 6
June-July was wine (grapes), dates, figs, olives
Aug-Sept were dates pomegranates summer figs and olives.
Of passing note, when Zedekiah sent out and told the Jews to come back into Judea to harvest "wine" and "summer fruits", this must have been just before this season and the early grapes were harvested beginning in the fourth month. Jerusalem was destroyed in the 5th month. Thus it was not the same year Jerusalem was destroyed in the 19th of Nebuchadnezzar in the 7th month that Gedaliah was assasinated, but the following 7th month, in the 20th of Nebuchadnezzar. This is further confirmed because there is a 2-year gap from the destruction of Jerusalem 70 years later which dates year 2 of Darius the Mede, and 70 years after the mourning for Gedaliah which began a year after his death was in year 4 of Darius the Mede. At any rate, with the presumption that these harvests were going on or just beginning places this proclamation earlier in the year than the summer, that is, late spring and with summer approaching.
Hope this was helpful. I know that sort of punches a hole into the planting season in the spring which might have some pagan inference, but as you can see, the Jews were doing their own thing and while some things are common among all the peoples of the regions, one is not presume that everything the Jews did came from Caanan and their customs and their festivals, though certainly the Jews were influenced by their neighbors.
Interesting JW doctrine, though they understand the BODY of Christ is represented by unfermented cakes and he specifically fulfills the "firstfruits" he is excluded from a reference by the wave offering at Pentecost of leavened loaves of wheat, their explanation being these represent Christ's imperfect followers, one loaf representing the Jews and the other the gentiles; but that excludes Jesus having representation as the "firstfruits" of wheat, though the Bible says he represents the "fristfruits" without distinction. It also ignores that there is a first and second coming, if in the flesh, would be represented by these different wave offerings. Oh well......
Thanks, again, for the references. Hope this was helpful.