Denver's high elevation causes it to be cooler than other cities at the same latitude.

Denver, known as the "Mile High City," sits at an elevation of around 5,280 feet (1,609 meters) above sea level, which significantly impacts its climate. Higher elevation means thinner air and lower atmospheric pressure, leading to cooler temperatures compared to lower-altitude cities at the same latitude. The decrease in temperature with elevation—known as the lapse rate—causes Denver’s climate to be cooler year-round than nearby, lower-elevation areas. This cooling effect is especially noticeable during summer, making Denver’s temperatures more moderate despite its inland location.