Sales of chocolate candy bars go up in cold months. In the Northeast, they peak when muggy conditions are called for at night. But in the Southwest, a higher heat index will boost sales.
Charcoal sales are highest in the summer. But in the South and Northeast, people tend to stock up when a higher minimum wind chill is forecast.
Dandruff shampoo sales go up on muggy days in the Central U.S. and on days with high wind chill in the Southeast.
Bug spray sales, which spike in the summer, are highest in clear conditions in West North Central States and in foggy conditions in the Northwest.
