With Memorial Day behind us, summer is officially on the way, and in places like Atlanta, the heat and humidity have already made their presence felt. As I struggled through my Saturday morning run, I couldn’t help but feel like I was running through a pool of water instead of air. The humidity was thick, and even though I was running at my usual “easy” pace, I had to slow down significantly.
As someone with a background in exercise physiology, I understood why this was happening: when the air is already saturated with moisture, sweat doesn’t evaporate as efficiently, making it harder for our bodies to cool down. This led me to think: How can I objectively adjust my pace when running in such oppressive conditions? A little research pointed me in the direction of the dew point, which turns out to be a more reliable indicator of how to adjust for hot, humid weather than simply tracking the relative humidity.
Why Dew Point Matters for Running
The dew point is the temperature at which the air would need to cool in order to reach 100% relative humidity. Essentially, it’s a better measure of how “muggy” the air feels because higher dew points mean there’s more moisture in the air. According to the National Weather Service, a dew point below 55°F is considered dry and comfortable, 55°F to 65°F feels muggy, and anything above 65°F starts to feel oppressive.
In Atlanta, the average dew point in July is around 69°F, which can make running feel even more difficult. But how does this affect your pace? I found some helpful tables that use both temperature and dew point to calculate how much you should adjust your running pace based on these conditions.
How to Adjust Your Pace Based on Temperature and Dew Point
To use these guidelines, find the current temperature and dew point on the x and y axes, respectively, and note where they intersect to determine the recommended pace adjustment. You can also just add the temperature and dew point together to get a quick number for this purpose.
Here’s a breakdown of the recommended pace adjustments:
- 100 or less: No pace adjustment
- 101 to 110: 0% to 0.5% pace adjustment
- 111 to 120: 0.5% to 1.0% pace adjustment
- 121 to 130: 1.0% to 2.0% pace adjustment
- 131 to 140: 2.0% to 3.0% pace adjustment
- 141 to 150: 3.0% to 4.5% pace adjustment
- 151 to 160: 4.5% to 6.0% pace adjustment
- 161 to 170: 6.0% to 8.0% pace adjustment
- 171 to 180: 8.0% to 10.0% pace adjustment
- Above 180: Hard running is not recommended
Putting It into Practice
To make this easier to apply, you can find your usual running pace and see how much time you should add for each percentage change in pace. For example, if the temperature is 75°F and the dew point is 65°F, their sum equals 140, which suggests a 2-3% pace adjustment. If your typical pace is 10 minutes per mile, you should plan to run between 10:12 and 10:18 per mile to account for the weather.
Final Thoughts
Running in hot, humid conditions doesn’t have to be a struggle. With the right adjustments, you can keep your pace in check and stay safe. Don’t forget to stay hydrated, and remember: slowing down is not only okay, but it’s the smart choice when the heat is on.
Happy running!