CHICAGO (CBS) — The postman’s creed doesn’t mention anything about subzero temperatures, but it might as well, since Wednesday’s Arctic conditions weren’t staying Chicago area couriers from the swift completion of their appointed rounds.

Postal carrier Manny Uy was walking his route on the Northwest Side, bundled up as best he could.

“I’m wearing a thermal, and a uniform coat, and my uniform. Plus I’ve got a fleece jacket, and I put my hat on my ear,” he said.

Uy has been working for the U.S. Postal Service for 15 years. The famous creed that starts “Neither snow nor rain” might not be the official Postal Service motto, but Uy said, for mail carriers, days like Wednesday go with the territory.

“Day after day, when it’s cold in the winter, you take one day at a time,” Uy said.

He knows delivering the mail, even when the temperature dips below zero, must be done.

“It’s very tough right now, but I know I can survive. I’ve been doing this for 15 years. I know I can do it,” he said.

Uy moved as fast as he could to try to warm up, and finish his route as quickly as possible, so he could get back inside.