Southern Mesoamerica has well-defined rainy and dry seasons. The rainy season generally begins in May and runs through October. The dry season generally begins in November and runs through April. Crops are typically planted at the onset of the rainy season and harvests are generally over by the onset of the dry season.
NASA Blue Marble imagery shows the surface of the earth in natural color. In other words, this is what the planet really looks like from high altitude with no cloud cover. There is a dramatic visual difference between the dry season and the rainy season in southern Mesoamerica.
Southern Mesoamerica in April at the End of the Dry Season |
Southern Mesoamerica in October at the End of the Rainy Season |
In Mesoamerica, the dry season was when agriculturalists were mobilized into fighting forces, surplus food supplies were available for provisions, infantry marches were feasible, and conditions in field camps were tolerable. Battles in southern Mesoamerica were generally not fought in the season corresponding to our June through September, the height of the rainy season.
Numerous war events recorded in Mayan inscriptions can be securely dated, and they follow the expected seasonal pattern. The Maya went to war in the dry season and stayed home tending their crops in the rainy season. See Stephen Houston's blog post "Watery War" in the blog Maya Decipherment, June 17, 2019, where he references data from Simon Martin.
The Book of Mormon in Alma 53:7 references this dry season fighting/rainy season farming pattern.