Indoors, American pair Meryl Davis and Charlie White was favored for gold in figure skating's ice dance.
After bright sunshine brought unusually warm temperatures last week, the heavy fog required a one-day delay in a men's biathlon race and the men's snowboard cross competition. The fog, however, lifted in time for a women's biathlon race later Monday.
"This is standard for snowboarding and ski events," American snowboardcross rider Nate Holland said. "Mother Nature doesn't always cooperate."
After winning the short dance on Sunday, Davis and White had a small advantage over longtime training partners and rivals Tessa Virtue and Scott Moir of Canada heading into the free dance. Elena Ilinykh and Nikita Katsalapov of Russia were in third.
On Day 11 at the Sochi Games, three other sports were awarding medals: bobsled, freestyle skiing and ski jumping.