Decision to dispatch made as normal by the commander based on the weather and information available at the time, which was appropriate. Aberdeen was SNOCLO and expected to open at 1500, but further snow showers led to the opening time going further and further back, hence the aircraft diverting back to MME and other flights also heading for ABZ diverting. It happens in winter and that's why we carry diversion fuel for alternates. Entirely reasonable given the circumstances and information available. .