(NEW YORK) — 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.

But according to a new analysis by Climate Central, climate change is threatening the optimal conditions that help elite runners break world records and amateurs achieve their personal bests.

The report from the nonprofit science research group found that as our planet continues to warm due to human-amplified climate change, ideal marathon conditions will become increasingly rare for

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