And I bear record that the people of Nephi did seek diligently to restore the Lamanites unto the true faith in God. But our labors were vain; their hatred was fixed, and they were led by their evil nature that they became wild, and ferocious, and a bloodthirsty people, full of idolatry and filthiness; feeding upon beasts of prey; dwelling in tents, and wandering about in the wilderness with a short skin girdle about their loins and their heads shaven; and their skill was in the bow, and in the cimeter, and the ax. And many of them did eat nothing save it was raw meat; and they were continually seeking to destroy us. (Enos 1:20.)
The French explorer, Samuel de Champlain, actually described the Iroquois
and Algonquians of New York and along the St. Lawrence River as going
entirely naked in his writings and drawings in 1602, a scene he captured in
the accompanying illustrations. Sier de Roberval, the first Governor General
of America’s “New France,” said of the Iroquois along the St. Lawrence River
(a New York based tribe), “. . . are a people of goodly stature and well
made; they are very white, but they are all naked, and if they were
appareled as the French are, they would be as white and as fair, but they
paint themselves for fear of heat and sunburning.”(Malory, p. 170.)
“The promised and was quite surely located in the tropics since no indication of cold or snow is given in the text while heat is.” 
As important as the weather patterns and seasons seems to be, the plates of the Nephites had to be kept for more important issues, such as the spiritual progress, their wars, the reigns of their kings, dealings with apostates, their ship building and migrations, their various episodes of righteousness and wickedness, their temple building, and most important of all, the visit of the Risen Lord among them. Moreover, anyone given the arduous task of engraving on metal plates would not have wasted their energy and time on such trivial matters, and not just as a matter of convenience, but by way of commandment.
Wherefore, I shall give commandment unto my seed, that they shall not occupy these plates with things which are not of worth unto the children of men. (1 Nephi 6:1-6.
Nevertheless, since it is a subject of much interest, a discussion of the weather patterns of the northeast during the Book of Mormon era, both Nephite and Jaredite, seems appropriate here.
The Archaic Period
The close of the last Ice Age saw the weather patterns in the northeast
change from bleak and cold to warmer than it is today which precipitated the
melting of the great glaciers covering so much of Canada and the
northeastern United States. This warm condition persisted until around 1000
B.C., when it became somewhat moister and cooler, although still warmer than
currently. Another drop in temperature took place around the time of Christ
and has persisted relatively unchanged until our present day—notwithstanding
various fluctuations over the years, such as the little ice age which is
thought to have begun somewhere between 1250-1600 and ended around 1900.
And it came to pass that when they had humbled themselves sufficiently before the Lord he did send rain upon the face of the earth; and the people began to revive again, and there began to be fruit in the north countries, and in all the countries round about. And the Lord did show forth his power unto them in preserving them from famine. (Ether 9:35.)
Ritchie instructs us that when the last remnants of the ice sheets disappeared from the northeast, forests of mixed evergreens and hardwoods covered much of the land. Many of the existing mucklands were shallow lakes in those days, and “the streams flowed clearer, deeper, and certainly more constantly than now due to the thick spongy covering of the forest floor.” Fossil samples indicate that the relatively warm, humid conditions made it especially favorable for hunting and fishing and gathering wild plant foods, especially fruits and nuts. Ritchie points out that while the expansion of people also took them into lower Ontario, the archaic population was more numerous in New York, with its milder winters and probably more abundant wildlife than in lower Ontario, with the possibility that the weather was becoming increasingly warmer and drier during this era.
The Nephite Era
The weather remained the same during the first 600 years of Nephite occupation in the land, only changing again after the birth of Christ when pollen samples indicate a cool, moist climate phase began to prevail over most of the area, much as it does today. Yet, while New York enjoys a temperate climate, the regions to the east of the lakes can sometimes be hit rather hard during the colder winter months. Thus, since Book of Mormon territory appears to extend along much of the region to the east of Lake Erie, there can be little doubt that the Nephites experienced harsh winters at times during the last 384 years of their existence in the land. Yet their summers would have been as moist and hot as they are today as well, a condition hard to travel in, let alone fight in. The time period given the episode which speaks of Teancum’s army successfully overpowering the Lamanites because they were fatigued due to their labors and the heat of the day came in 67 B.C., according to Book of Mormon footnotes, which was before the climate change which took place at the time of Christ. But, whether before or after, the region would have endured hot, humid summers in either case. Thus, it seems foolish to discount New York as a plausible setting for the Book of Mormon saga simply because of one lone reference to the heat of the day, which some speculate can only be referring to the tropics. People still die in New York in the summer months, due to the heat and high humidity.
And it came to pass that when the night had come, Teancum and his servant stole forth and went out by night, and went into the camp of Amalickiah; and behold, sleep had overpowered them because of their much fatigue, which was caused by the labors and heat of the day. (Alma 51:33.)
1-John Sorenson, The Geography of Book of Mormon Events: A Source Book, p. 351. F.A.R.M.S.
2-William A. Ritchie, The Archaeology of New York State, p. 32.
3-William A. Ritchie, Indian History of New York State, Ed Leaflet, No. 6, p. 6.
4-William A. Ritchie, Indian History of New York State, Ed Leaflet, No. 6, p. 10.
5-William A. Ritchie, Prehistoric Archaeology and the New York State Museum. Ed. Leaflet, No. 22, p. 5.