Calm, intensely cold weather, plenty of hexagonal ice crystals in the air, clear skies, very low sun, high latitude => perfect conditions for development of parhelia ('sun dogs') and other refractive atmospherical phenomena.
I snapped this on my return from the dentist's. The narrow angle of the 40mm Nikkor meant I only got one out of two sun dogs in this frame. This is the right hand side dog.