None, for several months.
The definition of the arctic circle is that point at which high summer gives you one day of 24hr sun, and mid winter gives you one day of 24 dark.
Go closer to a pole than that, like Phoenix, and you have more days of each.
Here on earth, each pole gets 179 days of dark, 179 days of sun, and a day-night cycle linking between them.
http://www.nasa.gov/mission_pages/phoenix/images/press/Goldstein2_Chart_SD_Fix.html