Climate change threatens to make running marathons even harder, research shows

October 29, 2025

When the tens of thousands of runners hit the streets this Sunday for the New York City Marathon, they’ll be competing in weather conditions a bit warmer than experts say is optimal for peak performance. While the “sweet spot” for competitive running varies by gender and ability, researchers believe the ideal marathon running conditions are somewhere between 39 degrees and 50 degrees Fahrenheit.

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