Bushels of watermelons on display in a wholesale market.
In my childhood, growing up in the American Pacific Northwest, watermelon was a summer time treat; something enjoyed during weekend barbecues when one or more of my mother's numerous brothers and sisters would come to town with their own sometimes large families. A large melon would be the simple dessert to a picnic styled meal.
In Thailand, watermelon can be grown all year round. It's one of several fruits you can count on seeing on every fruit platter, along with pineapple, rose apples and guavas. Watermelon is one of the most cooling of all Thai fruits. Nothing quite takes the edge off a spicy meal like a bit of melon. Thais grow the same varieties you will find in most other parts of the world, including melons with yellow flesh as well as the common red type.
Exactly where watermelons were first cultivated is not known for sure. However, it is known that they were grown in ancient Egypt as much as 5,000 years ago. The melons can be seen in paintings and seeds have been found in tombs. It has also been suggested that the Egyptians pickled watermelons as well, although I'm not sure why.