Like Christmas Day, Boxing Day also saw a temperature inversion in the valley, with associated bands of mist. This station was affected for parts of the day, such that temperatures failed to exceed 1 degree.
At the time the photograph was taken (about 1430), the valley bottom was clear of mist, which was instead affecting around the High School, Moulin & Kinnaird, though a little higher, the view opened out & visibility was very good.