Sydney continues to miss out on the heat as most of southern Australia swelters this week. Some southern cities are struggling through an extended hot spell this week, with both Melbourne and Adelaide likely to reach 30 degrees for at least 10 consecutive days. Despite this stifling weather in the nation's south, Sydney is unlikely to break its seven-week run of days below 30 degrees any time soon. The last time Sydney reached 30 degrees was in mid-January, when the city hit 45.8 degrees, its hottest day on record. This was also the 8th day of summer above 30 degrees, and the last. The temperature has not reached 30 degrees in Sydney since that day, a notable contrast to all of the other southern state capital cities. During the 28 days of February, Perth reached at least 30 degrees on 20 days, Adelaide and Melbourne on 14 days, Canberra six days and Hobart five. This was equal to the record for that month in both Hobart and Melbourne. Sydney's missing late summer heat has been due to a dominance of high pressure over the Tasman Sea from late January, which resulted in persistent onshore winds along the NSW coast. This maritime air acted to hold the season's hot air masses inland, moderating daytime temperatures in Sydney. This week will see Melbourne set a new record for the longest run of days over 30 degrees in March, while Adelaide's run of heat only will have only been exceeded twice in 127 years of records. Those living in Sydney will have to make do with a familiar run of days in the mid-to-high 20s, which is still pretty warm for this time of year. If the city reaches at least 25 degrees for seven consecutive days it will be its longest March warm spell in three years. It only has three more days to go.