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. …

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.

Although the increase in the unadjusted rate in November is a sharp contrast to the 0.9-point decline seen in October, November’s 7.8% rate is still tied for the second-best unadjusted unemployment monthly reading of 2012. However, on an adjusted basis, November’s rate is the highest reading in six months. Looking at year-to-year comparisons, seasonally adjusted unemployment is down from 8.9% in November 2011.