Very few conceptions took place during the long hot summer. With air conditioning the fertility rates equaled those of the winter season. They developed into stronger and hardier adults, they were more intelligent, and they lived longer. In one study the June conceptions lived an average of 3.8 years longer than the October conceptions. Hens lay larger eggs in high latitudes where the cool season is long.
Horses are bigger, faster, and more efficient.
An average beef cow weighs 900 pounds in the northern states of the western plains, from 450 to 600 pounds in the southern parts of the country, and something under 200 in Panama. The cooler, stormy areas of the world supply most of the world's food, just as they supply most of everything else. The crops are at their best where the weather is stormy and changeable because you can count on the skies to deliver the moisture required for the crops, also the climate necessary for high crop production. You do most of your reading in the winter and spring, least in the midsummer. But if you decide to pick up a book during July or August, it is probably a novel or collection of short stories.