Ah, summer. Warm days, picturesque skies, and, historically, a period when the stock market slows down. The summer “doldrums,” as investors call them, often involve bearish or sideways market movements. These can lead to stunted or even negative returns until conditions improve as the year progresses. So, how can investors avoid doing a sideways shuffle during summer? Well, they can invest in quality dividend stocks. And what’s more “quality” than companies that have increased their payouts for 50 years or more in a row? So, today, we’ll look at three high-yield Dividend Kings that you can buy…