Hi, The headache may not be like Migraine. Any fractured site when exposed to cold environment in rainy / winter seasons, chances of getting mild dull aching pain may present. The callus formation after consolidation fuses the fractured segments . In Such weather changes the blood circulation to those fusions get reduced , they may cause pain. Since your fracture involved in nasal bone it mimics migraine. Hot fomentation/ steam inhalation may be helpful. If problem persists meet rhinoplastic surgeon who deals it good. Take care