The then-new Busch Stadium hosted the All-Star Game on July 12, 1966. If you've ever been in St. Louis in July, you know how hot and humid it can be. And this day was a scorcher. At game time, the temperature was 105 °F, and the artificial turf on the field raised the on-field temperature to 113 °F.
77 year old Casey Stengel, soon to be inducted into the Major League Baseball Hall of Fame, had come to St. Louis to see the game. He was asked how he liked the new stadium, and his response was a classic Stengelism that lives in baseball lore to this day.
"It holds the heat well."
Source
http://www.pubdim.net/baseballlibrary/ballplayers/S/Stengel_Casey.stm