[reemrevnivek]

Here's Wikipedia's climate data for Lulea:

http://en.wikipedia.org/wiki/Lule%C3%A5#Climate

Looks a little cooler than most of the northern US. "Artic Circle" or not, you're right, this isn't "Open the doors and cool the servers" cold.

[seanos]

But it is "Open the doors and cool the servers" cold in winter at least, so savings from cooling are sure to be substantial. Coupled with the cheap electricity in summer, and well developed infrastructure, and you can see why it was chosen.