When Mother Nature whips up a wicked winter wind-chill factor it creates a real health risk for outdoor workers if they don’t take precautions against what OSHA calls “cold stress”: hypothermia, frostbite, and trench foot—a nonfreezing injury to wet, cold feet.

Hot summer weather can pose special health risks to older adults. The National Institute on Aging (NIA), part of the National Institutes of Health, has some advice for helping older people avoid heat-related illnesses, known as hyperthermia.