Remember that even when it’s chilly, basic safety measures still apply, and they’re even more crucial now, when hundreds of thousands of Americans are getting sick every day. Maintain your distance. Wear a mask. Avoid any situations that increase your risk. “It would defeat the purpose to travel in a car with someone outside your household to get to a place to do an outdoor activity,” says Lisa Miller, an epidemiology professor at the University of Colorado School of Public Health.