What is the world record for watermelon seed spitting distance? How does the United States rank in watermelon production? How many months of the year can you have watermelons?
This site should answer some of your questions: https://extension.psu.edu/business/ag-alternatives/horticulture/melons-and-pumpkins/watermelon-production
In case you're thinking of growing watermelons, here's some more info: https://www.gardeningknowhow.com/edible/fruits/watermelon/growing-watermelon.htm