U.S. unemployment, as measured by Gallup without seasonal adjustment, was 7.8% for the month of November, up significantly from 7.0% for October. Gallup's seasonally adjusted unemployment rate is 8.3%, nearly a one-point increase over October's rate.

These results are based on Gallup Daily tracking interviews, conducted by landline and cell phone, with approximately 30,000 Americans throughout the month -- 67.2% of whom are active in the workforce. Gallup calculates a seasonally adjusted unemployment rate by applying the adjustment factor the government used for the same month in the previous year. Last year, the government adjusted the November rate upward by 0.5 percentage points.

It is unclear what caused the increase in the unemployment rate in November, although some experts speculate that it was caused by jobs lost as a result of superstorm Sandy. It is also possible that lackluster holiday hiring is to blame.

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