Much of the US entered the new year facing below-freezing temperatures, feet of snow and even ice storms. And the harsh winter weather can lead to the “winter workplace blues” for affected workplaces, according to a survey of more than 2,700 US workers by Accountemps, a division of Robert Half International Inc. (NYSE: RHI).

The survey found 38% of professionals said winter weather has a negative impact on their mood at work, and about one-quarter, 26%, cited January as the least happy month.

The seven cities where workers give winter a thumbs-down include: Pittsburgh, Detroit. Cleveland, Chicago. Boston, Indianapolis and Minneapolis.

“Winter doldrums are a reality at work in some cities, often due to colder weather, fewer hours of daylight and holiday festivities ending,” said Michael Steinitz, executive director of Accountemps. “Employers can do their part to lift morale by fostering a collaborative, engaging and supportive office culture year-round.”

Accountemps provided five tips to help employees beat the winter blues and boost their mood and productivity at work.

1. Stay active. Take a brisk walk outside (weather permitting) or hit the gym during lunch to clear your mind and get energized to tackle your next project.
2. Nourish yourself. When you’re hungry, snack on fresh fruit or nuts. They’re much better for your body and focus than sugary or greasy selections from the vending machine.
3. Make time for small talk. Sometimes the best ideas come from casual conversations. In between tasks, grab coffee or lunch with a colleague.
4. Set goals for the year ahead. Now is the time to think about your career objectives and what you would like to accomplish in the coming year. Write them down and have a discussion with your manager about your goals.
5. Pursue professional development. Explore the idea of attending seminars and workshops to gain new skills, build your network and increase your marketability.

On the flip side, professionals’ moods are impacted positively during winter. These seven cities where most workers say they are positively affected include Miami, San Diego, Austin, Texas; Dallas; Los Angeles; and Houston.