Why I Always Check the Wet Bulb Temperature Before a Summer Run

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Working out in the heat can be merely unpleasant, or it can be dangerous, depending on the day—and there's a good way to tell what kind of day it is. This summer, I've checked the wet bulb temperature before nearly every run I've been on. This number is more important to me than the actual temperature, or even the "feels like" temperature, because it helps me gauge the safety of exercising outdoors. I'll delay or call off a workout if the wet bulb temp is too high.