Prairie Falcon in a snowy setting

If you knew just how far away this bird was, lol! Not much more than a large speck in a distant tree, to the naked eye. So heavily cropped and a miracle it's just OK to post for ID purposes. The white line above the eye is clearly visible. Too bad that the falling snow makes it look like it has a few spotted feathers : ) I rarely see a Prairie Falcon, so this was a treat. Does anyone know if this a juvenile? Taken on 29 November 2012 at Hull's Wood, Fish Creek Park. A grey day today with freezing fog, with all the trees covered in whte snow/frost. Beautiful to see, but wish the sun would come out. It's -11C (12F) with windchill of -18C (0F).

en.wikipedia.org/wiki/Prairie_Falcon