<P> In the Sydney central business district, an average of 15 days a year have temperatures of more than 30 ° C (86 ° F) and 3 days with temperatures over 35 ° C (95 ° F). In contrast, western suburbs such as Liverpool and Penrith have 41 and 67 days with temperatures above 30 ° C (86 ° F), 10 and 19 days above 35 ° C (95 ° F), and, 1 and 4 days above 40 ° C (104 ° F), respectively . The highest recorded maximum temperature at Observatory Hill was 45.8 ° C (114.4 ° F) on 18 January 2013 during a prolonged heat wave across Australia from early December 2012 to late January 2013 . The highest recorded minimum at Observatory Hill is 27.6 ° C (81.7 ° F), registered on 6 February 2011 . A similar minimum temperature has also been recorded in the western suburbs . </P> <P> Late summer conditions continue until the last few weeks of March where maximum temperatures hover around 25 ° C (77 ° F) and 29 ° C (84 ° F) with the dewpoint being around 16 ° C (61 ° F) and 17 ° C (63 ° F) on average . Although, unlike late summer, the nights may be seemingly cooler and crispier . </P> <P> The transition from late summer to autumn is gradual, where noticeably cooler and crisper conditions taking in affect by around April . In mid-autumn, the highs typically average at a pleasant 23 ° C (73 ° F), rarely going above 26 ° C (79 ° F) or below 20 ° C (68 ° F). In May, the average highs would be around 22 ° C (72 ° F) and 19 ° C (66 ° F) with cool and usually humid nights, that seldom dip below 10 ° C (50 ° F). Wintry highs of 17 ° C (63 ° F) may be expected in the last week of autumn . </P> <P> Temperatures in autumn are usually consistent and stable, lacking any extremes that tend to be experienced in spring and summer . Due to moist easterlies that prevail in this season, foggy mornings and overcast conditions should be expected . The average 9am relative humidity in autumn ranges from 72% to 80% in the Sydney region, the highest in the year . The lowest maximum temperature in autumn is 11.3 ° C (52.3 ° F), recorded in 24 May 1904 . </P>

When does the weather cool down in sydney
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