The mail won't wait - no matter how cold it gets. People like carrier Latrice Lewis get it delivered.
"You deliver mail, you turn that heat up on high, you get out there you throw it," she said. "You go back in, get a little warm, then throw it again. That's it."
She's among the many braving the cold. Lamont Hodges was waiting on the bus to go to work with long johns, hand warmers, ski goggles and a big, warm coat.
"I'm thinking about getting a cab to Eight Mile," he said. "It's very cold. You got to do what you got to do when you pay your own bills, right?"
Happy he didn't have to wait too long before Hodges' bus came along, FOX 2 then stopped in to see Detroit firefighters - waiting for their next run in the bone-chilling cold.
"Your coat will freeze solid within minutes,' firefighter Joseph Palm said. "Because we're obviously soaking wet."
"We'll have icicles hanging off our fire helmets. Guys with mustaches have icicles hanging off their moustache. Yes it's brutal, but somebody's got to do it. When the bell rings, we go."
But fighting the fires in freezing temperatures isn't the only problem - just getting there is tough. Slippery streets make for a tough road for emergency vehicles.
And then there are the hydrants, with many frozen. It is important for residents with hydrants on their yards to shovel them out from the snow to make them accessible.
Detroit firefighters also say many of the runs they respond to in this weather involve space heaters or electrical problems. They urge people to get smoke detectors - and fire extinguishers.
If you can't afford them - Detroit firehouses can help you out.
Speaking of help - around the corner at Liberty Tax - it's so cold outside, even the dancing statue was told to stay home.
FOX 2: "Where is the dancing statue?"
"The waver got the week off," said Joe Cottone from Liberty Tax. "I've had people complain when it's too cold that the waver shouldn't be out there."
Cottone had FOX 2's Amy Lange gave it a try - and was unsuccessful. And freezing.