Doctors give advice on how to cope with race day conditions.

Dr. Adam Tenforde, director of running medicine and sports medicine physician at Mass General Brigham, says a well-tuned marathon runner is also attuned to the forecast.

Depending on weather conditions – which can change drastically over the course of a race lasting more than two hours – runners may see favorable winds that push them to break personal bests, or suffer from a myriad of health problems, including dehydration and hypothermia.

During the 2018 Boston Marathon, more than 2,700 runners, including 25 elite athletes, received medical treatment due to “dangerously cold” weather, according to the Boston Athletic Association. Ninety-one runners were taken to hospital. According to the BAA, 4.2% of runners who started the 2018 race did not finish it.

Complete the story at BostonGlobe.com.