Melbourne shivered through its coldest morning since spring with temperatures as much as five degrees below average. The city experienced its coldest morning since the second day of spring with a minimum of 5.6 degrees, three below average for May. Bulleen bottomed out at just 0.9 degrees, also the coldest since early September. Melbourne and Essendon Airports both dipped to just three degrees, also five below average. The low temperatures this morning caused fog in Melbourne's southeast, reducing visibility to 200m at Mentone. Clear skies and light winds under a high pressure ridge combined with a cool air mass last night, allowing the mercury to plummet early this morning. The ridge will linger over Victoria again tonight, causing temperatures to reach single figures again tomorrow morning. This is likely to once again produce patches of morning fog. Looking further ahead, an increase in cloud and moist onshore winds should keep minimum temperatures above average over the weekend.