The wet bulb globe temperature is another way to quantify the impact of hot days on the body. Kingwood High School head football coach Stacy Williams says using the wet bulb globe temperature is a game changer in keeping his athletes safe, and something they're working around. Based on the wet bulb globe temperature, the UIL has precautions in place for high school athletes. If the wet bulb globe temperature is equal to or above 92.1 degrees, outdoor practice should be canceled altogether. And just like the heat index, the wet bulb globe temperature can vary during the day.