And what makes you think that people in freelancer are outdoors any less than on Earth? There are lots of outdoor activities that many people would do all day and hell there is still farming, which seems such a big factor in your equation, even if more advanced. The climate would be a bigger factor I'd argue anyways.
Calmodulin gave a good answer. You might want to refer to that, case closed in my opinion. Not to mention this is a stupid topic to begin with, your really going to generalise the whole of Sirius in terms of their daily outdoor activity, while not considering the vast range of planetary climates, not to mention the science behind skin pigmentation?