Brutal cold complicates jobs of firefighters, shelters, police - The Boston Globe

As gusts of wind made single-digit temperatures feel brutally colder yesterday, Newton firefighters battled a blaze on Woodward Street while trying to keep their balance on surfaces that the spray of fire hoses turned into instant skating rinks.
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Rising temperatures and increasing clouds should offer respite today, said Charlie Foley, meteorologist for the National Weather Service. As for the cold, blame a low pressure system.

"The low did two things: It brought the snow, and as it departed, it brought the cold arctic air," Foley said. "It had a twofold purpose and it just drew down this cold Canadian air on northwest winds. So in spite of the sunshine, it was still bitterly cold."

Indeed, he added, "with a clear sky, any heating from the sun just goes right up into the atmosphere, and the temperature plummets. The clouds act as somewhat of a blanket to moderate things."

But shouldn't that heat bounce of the carbon dioxide and return back to the ground?