When heat is combined with physical activity, loss of fluids, fatigue, and other conditions can lead to a number of heat-related illnesses and injuries. Death is even possible. Heat stress is commonly associated with warm weather. It is true that warm weather increases the number of heat-stress injuries and illnesses. Warm weather is not the only cause of heat stress, though.
Heat stress can occur any time the surrounding temperature is elevated.
Even if the weather is cool, you may work in warm areas, indoors or out. Be alert for conditions which could cause heat stress and take precautions to prevent it. Avoid alcohol, coffee and tea, which contribute to dehydration. Help workers adjust to the heat by assigning a lighter workload and longer rest periods for the first five to seven days of intense heat. And this process needs to start all over again when a worker returns from vacation or absence due to illness or injury.