While jobs secured through temp agencies offer a tryout for a permanent position, volunteer work can be an effective way to supplement the job search. Apart from filling long-term gaps in your resume, volunteering offers a chance to learn about a new industry and make important contacts who could be helpful down the line.

Career expert Alison Green, writing for U.S. News & World Report, explains that professionals considering changing careers can volunteer to learn if a new field is right for them. Green adds that while potential reward of volunteering could be a permanent position, any downside is limited. At the very least, you'll meet new people, assist in the community and boost your level of experience.

Volunteering can also do great things for a job seeker's self confidence, particularly for those who have been involved in a lengthy employment search.

"It's easy to start questioning your value when you're out of work, especially if you're not getting many interviews," Green says. "Volunteering can give you a sense of accomplishment that can turn your attitude around—and that often comes through to employers."

Local publications can be good resources to find volunteer opportunities, especially when it comes to holiday celebrations and annual events.